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Agricultural and Biological Sciences » "Sustainable Aquaculture Techniques", book edited by Martha Patricia Hernandez- Vergara and Carlos Ivan Perez-Rostro, ISBN 978-953-51-1224-2, Published: February 19, 2014 under CC BY 3.0 license. © The Author(s).

Chapter 8

Use of Probiotic Bacteria against Bacterial and Viral Infections in Shellfish and Fish Aquaculture

By Héctor Cordero, María Ángeles Esteban and Alberto Cuesta
DOI: 10.5772/57198

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Use of Probiotic Bacteria against Bacterial and Viral Infections in Shellfish and Fish Aquaculture

Héctor Cordero1, María Ángeles Esteban1 and Alberto Cuesta1

1. Introduction

The term “probiotic” was firstly used to denominate microorganisms that have effects on other microorganisms [1]. Etymologically, the term “probiotic” was originated from the Latin word “pro” which means “for” and the Greek word “bios” which means “life”. The best known definition for probiotics was developed by the Food and Agriculture Organization (FAO), that defined them as live microorganisms which when administered in adequate amounts confer a health benefit on the host [2]. According to this description, the potential benefits are varied, and if probiotics were administered to shellfish or fish under intensive culture they could improve their production. It is known that virus and bacterial diseases/infections are one of the most important problems in aquaculture production at present. Probiotics can provide some solutions to this problem through different mechanisms or properties such as the production of inhibitory compounds such as bacteriocins, competition for adhesion sites with opportunistic or pathogen microorganisms, competition for nutrients with other bacteria or an improvement of the immune status (e.g. increase of production of immunoglobulins, acid phosphatase, antimicrobial peptides, improvement of cellular activities, etc.) [3-10]. Several reviews have already documented the benefits of probiotics in shellfish and fish but they mainly focused on their effects in the immune response. Thus, hypothetical and desired results of administering probiotics to shellfish or fish in culture will be improving their antiviral and antibacterial defences, which is the focus of the present review. Firstly, a brief description of probiotics is included, and then a review of the main used probiotics against pathogenic virus and bacteria for shellfish and finally, the same for fish. The novelty of this review is based on the shared ability of probiotics to control both viral and bacterial diseases in shellfish and fish often share, which could be the basis for sustainable aquaculture.

2. Probiotic bacteria

There is a great diversity of tested probiotic bacteria, but only few of them have become in commercial probiotics (Table 1). Thus, further studies are mandatory to expand the use of laboratory described microorganisms with probiotic effects to the commercial level and then be used in the aquaculture industry. The procedure to test and market a probiotic is resumed in Figure 1.

Commercial name Animal/Human Reference/Comments
AlCareTM MammalianContains Bacillus licheniformis
Alibio® Fish[30]
Bactisubtil® HumanContains Bacillus cereus
Bactocell® PA 10 Fish[42]
BaoZyme-Aqua FishContains Bacillus subtilis
BGY-35 Fish[51]
Biogrow® MammalianContains Bacillus subtilis and B. licheniformis
Bio-Kult® HumanContains B. subtilis
BioPlus® 2B Fish[73]
Biosporin® HumanContains B. subtilis and B. licheniformis
Biostart® FishContains a mix of Bacillus spp. and Paenobacillus sp.
Biovicerin® HumanContains B. cereus
Bispan® HumanContains Bacillus polyfermenticus
Cernivet® Fish[85]
Domuvar HumanContains Bacillus spp.
Ecomarine® Shellfish
Esporafeed Plus® SwineContains B. cereus
Lactobacil Fish[45]
Lactopure MammalianContains Lactobacillus sporogenes
Liqualife® FishContains Bacillus spp.
Neoferm BS 10 MammalianContains Bacillus clausii
Neolactoflorene HumanContains Lactobacillus spp. and Bacillus spp.
Promarine® Shellfish
SanoCare® FishContains Bacillus spp.
SanoGuard® FishContains Bacillus spp.
SanoLife® FishContains Bacillus spp.
Sporolac Fish[45]
Sustenex® HumanContains Bacillus coagulans
Toyocerin® Fish[85]

Table 1.

List of commercial probiotics, including those for shellfish and fish.

Probiotics are usually consisting on bacteria but some other microorganisms such as yeast, microalgae or even some fungi. They are mainly used as living cells but some studies have also shown their benefits when supplied as heat-inactivated cells (also known as heat-killed cells), formalin-killed (FKC), freeze-dried, dead cells or cell-free supernatant (CFS). Among the vast number of probiotic species used most information relies on the use of Bacillus sp. and Lactobacillus sp. Different administration modes have been checked, as bath, intraperitoneal or intramuscular injection and in diet being the bath and diet those preferred for the use in the aquaculture. Moreover, more recently, for oral dietary administration the probiotics can be encapsulated in different ways. Besides that, Artemia and rotifers (two main diets larvae in marine larviculture) are usually enriched with probiotics in order to produce benefits in the fish/shellfish larvae.


Figure 1.

Process for making commercial probiotics.

3. Probiotics against virus in shellfish

Viral infections are one of the most important problems in aquaculture production. In the case of shellfish, probiotics might provide a good preventive solution to this problem since they promote the innate immune response, which is the only one attributed to be responsible for the resistance in these animals.

Mainly seven viral diseases are known in shellfish which are: white spot syndrome virus (WSSV), lymphocystis disease virus (LCDV), infectious hypodermal and hematopoietic necrosis virus (IHHNV), taura syndrome virus (TSV), yellow head disease virus (YHV), infectious myonecrosis virus (IMNV) and Macrobrachium rosenbergii nodavirus (MrNV). Unfortunately, all the studies have focused on the potential preventive effects of few probiotics on the pacific white shrimp (Litopenaus vannamei) resistance against WSSV. In a single study it was demonstrated that bath treatment of L. vannamei specimens with the probiotic Vibrio alginolyticus at a dose of 105 cfu ml-1 showed a higher rate survival against WSSV compared to those non exposed to the probiotic [11]. Interestingly, most of the information comes from studies using dietary administration of the probiotics which results the most desired for aquaculture of shellfish. It has been reported that survival of L. vannamei specimens fed supplemented diets containing 105 cfu g-1 of a mixture formed by lactic acid bacteria (BAL3, BAL7, BC1 and CIB1) failed to protect against WSSV infections [12]. By contrast, dietary administration of 1010 cfu g-1 of Bacillus OJ in L. vannamei specimens produced significantly higher survival after challenge by WSSV [13]. It has also been reported that dietary administration of Pediococcus pentosaceus and Staphylococcus hemolyticus to L. vannamei specimens showed a decrease in the prevalence of WSSV, but not IHHNV [14]. Further studies including more shellfish species and virus are necessary in order to find potential solutions for the viral diseases found under their intensive culture.

4. Probiotics against bacteria in shellfish

In the case of bacterial diseases much more studies have focused on the benefits of the use of probiotics for shellfish species. Moreover, and in contrast to the viral pathogens described above, more shellfish species have focused the studies about the use of probiotics. Herein we will summarize the main findings about the potential use of probiotics against bacterial diseases grouped by shellfish species.

A first attempt to describe the probiotic potential of a microorganism comes from in vitro studies. Thus, it has been demonstrated that Pseudoalternomonas sp. strains DIT09, DIT44 and DIT46 isolated from Peromytilus purpuratus showed bacteriostatic anti-Vibrio parahaemolyticus activity [15] but their in vivo effects have not been tested yet. In a similar way, Roseobacter sp. strain BS107 isolated form the scallop (Pecten maximus) showed antibacterial activity against several pathogenic Vibrio sp. [16] as well as the probiotic Alteromonas haloplanktis obtained from Argopecten purpuratus larvae specimens [17]. Further preliminary studies of this kind are worthy to be taken in the future and prior to those conducted in vivo.

Several studies have been conducted in bivalves. In the case of Pacific oyster larvae (Crassostrea gigas) exposed to 105 cfu ml-1 of the pathogenic Vibrio tubiashii reached a total mortality in just 2 days, whilst in combination with 104 cfu ml-1 of the probiotic Aeromonas media A199 strain the larvae prolonged their viability up to 144 hours indicating its benefits when used by bath [18]. By contrast, C. virginica specimens fed supplemented diets containing 104 cfu ml-1 of Vibrio sp. OY15 for three weeks showed no effect in survival ratio after challenge with Vibrio sp. M183 [19]. It has been reported [20] that abalone (Haliotis discus hannai) specimens fed supplemented diet with 109 cfu g-1 of Shewanella colwelliana WA64 and Shewanella oyellana WA65 for four weeks showed a better survival rate (with mortalities of 27%-50% in WA64, and 30%-43% in WA65 compared with 77%-80% in the control group) when infected with Vibrio harveyi. In other research with other abalone specie, Haliotis midae specimens fed supplemented diet with a mix of three unknown probiotic strains (SY9, SS1 and AY1) at doses of 107 cfu ml-1 for two weeks showed a better survival ratio (62%) than control group specimens after intra-mantle injection of Vibrio anguillarum [21]. Further studies are still needed to broad the use of probiotics in bivalves against bacterial diseases.

Among the shellfish, most of the studies have at this respect focused on shrimps. Thus, western king prawn (Penaeus latisulcatus) specimens fed 20×105 cfu kg-1 diet of Pseudomonas aeruginosa and Pseudomonas synxantha for eighty-four days and afterwards challenged with V. harveyi. P. aeruginosa-supplemented diet improved the survival rate of the western king prawns more effectively than P. synxantha-supplemented diet, and furthermore, administration of both probiotics in combination resulted in better results than when administering separately [22-23].

Most of the studies administering probiotics have been developed in white shrimp (Litopenaeus vannamei) at different development stages. For example, Bacillus subtilis E20 administered in the diet at 106, 107 and 108 cfu kg-1 increased the survival rates at 13.3%, 16.7% and 20% respectively, after the injection of pathogenic V. alginolyticus [24]. In juvenile specimens, commercial white shrimp fed supplemented diet with 105 cfu g-1 diet of Bacillus subtilis UTM126 achieved a mortality of 18% against pathogenic infection of vibrios (including V. harveyi, V. alginolyticus and V. parahaemolyticus) while the control group mortality exceeded of 50% [25]. In other research, juvenile specimens fed supplemented diets containing V. alginolyticus UTM 102, B. subtilis UTM 126, Roseobacter gallaeciensis SLV03 or Pseudomonas aestumarina SLV22, separately, at doses of 105 cfu g-1 diet for four weeks showed low mortality (between 17%-22%) after immersion with Vibrio parahaemolyticus PS-017 compared with the control group (33%) [26]. In adult specimens of L. vannamei fed supplemented diet with 3×105 cfu of the probiotic Vibrio gazogenes per shrimp showed a decrease of mortality after infection with Vibrio spp. (including V. harveyi, V. anguillarum and V. alginolyticus) [27]. In addition, the inhibitory effect was also demonstrated in a in vitro assay [27]. Other recent work [28] has been carried out with white shrimp fed a supplemented diet containing 105 cfu g-1 (BM5) and 108 cfu g-1 (BM8) (two Bacillus subtilis strains) for 2 months, and afterwards each shrimp was injected with 107 cfu of Vibrio harveyi. Results indicate that cumulative mortality of the control group was 63.3%, whereas in the groups fed probiotics were of 20% and 33.3%, for the group fed BM8 or BM5 strains, respectively. Cumulative mortality also decreased in white shrimp fed a supplemented diet with 1010 cfu kg-1 of Lactobacillus plantarum after injection with V. alginolyticus [29]. Moreover, the administration of a mixture of Bacillus (B. endophyticus YC3-b, B. endophyticus C2-2 and B. tequilensis YC5-2) to the water at doses of 0.1×106 cfu ml-1 to juvenile specimens resulted in a high survival ratio (33%) compared with the control group (9.5%) after challenge with V. parahaemolyticus. However, a commercial probiotic (Alibio) at the same dose that the Bacillus mix had no effect in survival ratio compared with the control group in Litopenaeus vannamei specimens [30]. L. vannamei specimens fed diet supplemented with two potential probiotics (strains C2 and B6) achieved a better survival ratio (44% and 50%) than control group (21%) after infection with Vibrio harveyi in stages from Myosis 3 to postlarvae 1 [31]. Strikingly, other microorganisms such as yeast have been also assayed as potential probiotics. Unfortunately, L. vannamei specimens fed Saccharomyces cerevisiae, Phaffia rhodozyma and Saccharomyces exiguus showed no significant different in survival ratio after infection with V. harveyi compared with control group specimens [32].

Black tiger shrimp (Penaeus monodon) has also received much attention. Thus, P. monodon specimens exposed to 106 cfu ml-1 of B. subtilis BT23 for 5 days (long-term treatment) or for 1 hour (short-term treatment), and thereafter challenged with V. harveyi, showed a decrease in their cumulative mortality in both groups (32% and 60%, respectively) [33]. In other research, P. monodon juvenile specimens fed Bacillus sp. S11 at 1010 cfu g-1 diet for one month and infected with V. harveyi, combined with ozone addition, showed a significant increase in the survival ratio (75%) compared with the control group and not fed with probiotics [34]. Also in juvenile specimens fed supplemented diet containing Lactobacillus acidophilus 04 at dose of 105 cfu g-1 for one month showed a higher survival ratio (80%) than the control group (13.3%) after challenged with Vibrio alginolyticus [35]. In postlarvae specimens, dietary administration of Paenibacillus sp. EF012164 and Bacillus cereus DQ915582 at doses of 104 and 105 cfu ml-1 caused lower mortality after infection with Vibrio harveyi and Vibrio spp. (without statistical analysis) [36]. In other work, Penaeus monodon postlarvae specimens fed supplemented diet with 109 cfu g-1 diet of two strains of Synechocystis sp. (C51 and C54) separately for twenty days showed significantly better survival after infection with Vibrio harveyi MCCB 111 than those fed without probiotics [37]. Also in postlarvae specimens, dietary administration of Bacillus sp. P11 at 109 cfu g-1 caused a high survival ratio (66%) compared with the control group (0%) after 9 days of infection with Vibrio harveyi and Vibrio spp. [38]. Dietary administration of Artemia-encapsulated Bacillus sp. S11 showed an increased survival of Penaeus monodon when infected with Vibrio harveyi D331 [39]. Finally, dietary administration to P. monodon with 103 cfu ml-1 of Pseudomonas sp. PM11 and Vibrio fluvialis PM17 for 45 days did not alter the mortality after challenge with Vibrio anguillarum [40]. As it has been widely shown in shellfish and fish the use of low or suboptimal dosages of probiotics have no biological role, and in this case protective effect against pathogens.

Other shrimp species have received little attention. In the Indian white shrimp (Penaeus indicus) juvenile specimens fed diets supplemented with Lactobacillus acidophilus, Streptococcus cremoris, Lactobacillus bulgaricus 56 or L. bulgaricus 57 at doses of 5×106 cfu g-1 for 4 weeks and infected with Vibrio alginolyticus showed a higher survival rate (56% - 72%) compared with that observed in specimens of the control group (20%) [41]. Similarly, in blue shrimp (Litopenaeus stylirostris) specimens fed supplemented diet of 107 cfu g-1 of Pediococcus acidilactici for 4 weeks and infected with Vibrio nigripulchritudo SFn1 showed a mortality level of 25% in the probiotic-treated group while in non-treated group the mortality was of 41.7% [42]. It was also reported that Penaeus chinensis postlarvae specimens exposed to Arthrobacter XE-7 at dose of 106 cfu ml-1 and pathogenic Vibrios sp. (Vibrio parahaemolyticus, Vibrio anguillarum and Vibrio nereis) showed a significant higher survival ratio than specimens exposed to pathogenic Vibrios spp. alone [43].

Marron (Cherax tenuimanus) specimens fed five probiotics (Bacillus sp. AQ2, Bacillus mycoides A10, Shewanella sp. A12, Bacillus subtilis PM3 and Bacillus sp. PM4) separately showed no significant differences in survival rate. However, the total haemocyte count was significantly higher in all probiotic-treated groups compared with the control group after injection with 2×108 cfu ml-1 of Vibrio mimicus [44].

Overall, studies have shown that probiotics are good alternative to protect shellfish against pathogenic bacteria, namely against Vibrio sp. pathogens, the most important in the culture of shellfish. However, further studies are necessary to broad the probiotic candidates and the shellfish species prior they are applied to aquaculture from a practical point of view. Moreover, the mechanisms behind this protection are generally ignored and deserve deeper evaluation.

5. Probiotics against virus in fish

Viral diseases are major problems in fish farming since there is a lack of suitable antiviral agents and a very limited number of effective vaccines. Moreover, there are few studies about the effects of probiotics against viral infections in fish. Olive flounder (Paralychthys olivaceus) and grouper (Epinephelus coioides) are the two main species which have been studied. Olive flounder specimens fed 2.4×108 cfu g-1 of Lactobacil and/or Sporolac (commercial acid lactic bacteria) were infected with lymphocystis disease virus (LCDV) [45]. Lowest mortality rate was seen in groups fed Lactobacil (30%) or Lactobacil and Sporolac (25%) supplemented diets followed by groups receiving Sporolac alone (45%) compared to those groups fed without probiotics that showed a mortality of 80%. Evaluating the disease resistance of grouper through probiotics against virus infection, a recent study has demonstrated that specimens fed a supplemented diet with 108 cfu g-1 of B. subtilis E20 for 28 days showed a survival rate of 50% higher than the control group for seven days post-infection with iridovirus [46]. In another study, grouper specimens fed a diet containing L. plantarum at 108 cfu kg-1 and challenged with an iridovirus showed an increase in the survival of 36.7% compared to the survival rate in control group [47]. Similar results were obtained when grouper specimens were fed S. cerevisiae supplemented diet (5.3×107 cfu kg-1 for four weeks) and afterwards infected with a grouper iridovirus (GIV). Specimens of treated group showed a higher survival ratio (43.3%) than specimens in the control group (16.7%) [48]. Viral pathogens diversity and impact in the actual aquaculture deserves further characterization of the potential benefits of probiotics for economically important cultured fish world-wide.

6. Probiotics against bacteria in fish

By far, the effects of probiotics on fish have received most of the investigations. Among the fish studied, the rainbow trout (Oncorhynchus mykiss) has been the most evaluated. Many different probiotic bacteria have been tested and two of the best studied are Bacillus subtilis and Lactobacillus acidophilus, two lactic acid bacteria which showed in vitro inhibition against Aeromonas hydrophila [49]. Furthermore, B. subtilis avoids the development of Pseudomonas fluorescens while L. acidophilus had also antimicrobial activity against Streptococcus iniae. The information relative to the use of probiotics as a beneficial treatment of fish against bacterial pathogens is described below and summarized (Table 2).

Fish testedProbioticPathogenSurvivalCites
Anguilla anguilla Enterococcus faecium SF68 Edwardsiella tarda 981210L1 Significant increase for SF68 and no difference for B. toyoi [85]
Bacillus toyoi
Anguilla japonica Lactobacillus pentosus PL11 Edwarsiella tarda Significant increase[87]
Carassius auratus Aeromonas hydrophila A3-51 formalin-inactivated Aeromonas salmonicida Significant increase[90]
Carassius auratus Bacillus sp., Lactobacillus sp., Streptococcus faecium, and Saccharomyces cerevisiae Pseudomonas fluorescens 58CNo differences[89]
Xiphophorus helleri
Clarias gariepinus Lactobacillus acidophilus Staphylococcus xylosus Significant increase[91]
Aeromonas hydrophila gr2
Streptococcus agalactiae
Dicentrarchus labrax Vagococcus fluvialis Vibrio anguillarum Significant increase[107]
Epinephelus coioides Lactobacillus plantarum Streptococcus sp.Significant increase[47]
Saccharomyces cerevisiae Streptococcus sp.Significant increase[48]
Bacillus subtilis E20 Streptococcus sp.Significant increase[46]
Gadus morhua Carnobacterium divergens Vibrio anguillarum Significant increase[57]
Aeromonas salmonicida
Labeo rohita
Bacillus subtilis Aeromonas hydrophila No difference[96]
Pseudomonas aeruginosa VSG-2Aeromonas hydrophila MTC1739Significant increase[98]
Lactobacillus plantarum VSG-3 Aeromonas hydrophila Significant increase[97]
Miichthys miiuy Clostridium butyricum CB2 as alive and dead cells Vibrio anguillarum Significant increase[94]
Aeromonas hydrophila
Mycteroperca rosacea Debariomyces hansenii CBS-8000339 Aeromonas hydrophila AH-315No difference[50]
Oncorhynchus mykiss Clostridium botyricum Vibrio anguillarum Significant increase[95]
Streptococcus iniae Dan-1 formalin inactivated Streptococcus iniae virulentSignificant increase[80]
Pseudomonas fluorescens AH2 Vibrio anguillarum Significant increase[72]
Lactobacillus rhamnosus ATCC 53103 Aeromonas salmonicida ssp. salmonicida Significant increase[67]
Aeromonas hydrophila A3-51
Vibrio fluvialis A3-47S
Carnocterium sp. BA211
Unidentified coccus A1-6
Aeromonas salmonicida Significant increase[60]
Aeromonas hydrophila A3-51
Vibrio fluvialis A3-47S
Carnocterium sp. BA211
Unidentified coccus A1-6
Aeromonas salmonicida Significant increase[62]
Bacillus subtilis Bacillus licheniformis Yersinia ruckeri Significant increase[73]
Carnobacterium maltaromaticum B26
Carnobacterium divergens B33
Yersinia ruckeri
Aeromonas salmonicida
Significant increase[75]
Lactococcus lactis ssp. lactis CFLP100
Leuconostoc mesenteroides CLFP196
Lactobacillus sakei CLFP201
Aeromonas salmonicida ssp. salmonicida CLFP501Significan increase[63]
Bacillus sp. JB-1
Aeromonas sobria GC2
Streptoccocus iniae Significant increase[64]
Lactococcus garvieae
Vibrio anguillarum
Vibrio ordalii
Aeromonas salmonicida
Yersinia ruckeri
Bacillus subtilis AB1 as live, sonicated and formalized cells and cell-free supernatant Aeromonas sp.Significant increase[82]
Brochothrix thermophasta BA211
Aeromonas sobria GC2
Aeromonas bestiarum ORN2Significant increase[65]
Brochothrix thermophasta BA211
Aeromonas sobria GC2
Ichthyophthrius multifiliis Significant increase for GC2 and no difference for BA211[65]
Leuconostoc mesenteroides CLFP196 Lactococcus garvieae Significant increase[68]
Lactobacillus plantarum
Enterobacter cloacae Yersinia ruckeri Significant increase[74]
Bacillus mojavensis
Kocuria SM1 Vibrio anguillarum Significant increase[69-71]
Lactobacillus plantarum CLFP238 Lactococcus garvieae CLFP LG1Significant increase[66]
Lactococcus lactis CFLP100
Leuconostoc mesenteroides CLFP196
Pseudomonas sp. M174 and M162 Flavobacterium psychrophilum Significant increase[79]
Enterococcus faecalis inactivated Aeromonas salmonicida Significant increase[81]
Oplegnathus fasciatus Lactobacillus sakei BK19 Edwarsiella tarda No difference[88]
Oreochromis niloticus Lactobacillus acidophilus, Bacillus subtilis, Clostridium butyricum and Saccharomyces cerevisiae Edwardsiella tarda Significant increase[86]
Bacillus subtilis Aeromonas hydrophila, Significant increase[49]
Lactobacillus acidophilus
Pseudomonas fluorescens
Streptococcus iniae
Oreochromis Saccharomyces cerevisiae Aeromonas hydrophila Significant increase[51]
Pseudomonas fluorescens
Flavobacterium columnare
Paralichthys olivaceus Zooshikella sp. JE-34 Stretoccocus iniae Significant increase[93]
Bacillus subtilis Streptococcus iniae Significant increase (except for B. licheniformis)[92]
Bacillus pumilus
Bacillus licheniformis
Salmo salar Vibrio alginolyticus Aeromonas salmonicida 256/81Significant increase[52]
Vibrio anguillarum VIB256
Vibrio ordalii 17K
Vibrio alginolyticus Yersinia ruckeri Ex5No difference[52]
Pseudomonas fluorescens AH2 Aeromonas salmonicida No difference[55]
Salmo trutta Lactococcus lactis ssp. lactis CLFP100 Aeromonas salmonicida Significant increase[83]
Leuconostoc mesenteroides CLFP196
Salvelinus fontinalis S1, S5, S9 and S10 Flavobacterium columnare Significant increase[84]
Scophthalmus maximus Roseobacter sp. strain 27-4 Vibrio anguillarum Significant increase[108]
Phaeobacter sp. Vibrio anguillarum Unmeasured[102]
Ruegeria sp.
Lactobacillus plantarum Vibrio sp.Significant increase[99]
Carnobacterium sp.
Roseobacter sp.
Solea senegalensis Shewanella putrefaciens Pdp11 Photobacterium damselae ssp. piscicida Significant increase[104-105]
Shewanella baltica Pdp13
Sparus aurata Shewanella putrefaciens Pdp11 Vibrio anguillarum DC11R2Significant increase[103]
Bacillus subtilis Photobacterium damselae ssp. piscicida No effect[109]

Table 2.

Overview of the effects of probiotics against bacteria in fish.

Few works have evaluated the disease resistance of grouper (Epinephelus coioides) through probiotics against the pathogenic Streptococcus sp. Thus, dietary treatment of grouper specimens fed Lactobacillus plantarum at 106 to 108 cfu kg-1 [47] or 108 cfu g-1 of Bacillus subtilis E20 [46] showed a better survival rate than the control. Moreover, the yeast Saccharomyces cerevisiae has shown probiotic effects in the grouper. Feeding with 5.3×107 cfu kg-1 yeasts four weeks showed a higher survival ratio (56.6%) than the control group (20%) after infection with Streptococcus sp. [48].

Leopard grouper (Mycteroperca rosacea) specimens fed supplemented diet with 106 cfu g-1 of Debaryomyces hansenii CBS 8339 for five weeks showed an increase in immunoglobulin M (IgM), catalase (CAT) and superoxide dismutase (SOD) after infection with Aeromonas hydrophila AH-315 and there was no mortality in any group [50].

Nile tilapia (Oreochromis niloticus) fed supplemented diet containing 0.5×107 cfu g-1 of a mixture of B. subtilis and L. acidophilus, or 107 cfu g-1 of each bacteria alone, for two months showed a higher relative level of protection against Aeromonas hydrophila, Pseudomonas fluorescens and Streptococcus iniae compared to the control group [49]. The results were even better when fish were fed a commercial probiotic supplemented diet containing S. cerevisae. Similar results were also obtained in another two experiments using as a challenge an injection of 2×107 cfu ml-1 of P. fluorescens and fish immersion with 2×109 cfu ml-1 of Flavobacterium columnare [51].

Probiotic bacteria identified as Vibrio alginolyticus was inoculated intramuscular or intraperitoneally in atlantic salmon (Salmo salar) at doses of 4×106 cfu ml-1 followed by a bath for ten minutes in a suspension of the same probiotic with 108 cfu/ml and seven days later fish were challenged with Aeromonas salmonicida 256/81, Vibrio anguillarum VIB256, Vibrio ordalii 17K or Yersinia ruckeri Ex5 [52]. So, this work indicated that application of the probiotic to salmon specimens induced a decrease in mortalities after challenge with Aeromonas salmonicida 256/81, and to a lesser extent with Vibrio anguillarum VIB256 and Vibrio ordalii 17K and does not reduce mortality with Yersinia ruckeri Ex5. In this sense, competition in vitro studies will help to elucidate these in vivo results. In other work [53] atlantic salmon specimens were fed a supplemented diet with 5×108 cells ml-1 of the microalgae Tetraselmis suecica for 14 days were challenged with fish pathogens. Results showed that use of T. suecica as a probiotic supplement was successful in preventing mortalities caused by Aeromonas hydrophila, Aeromonas salmonicida (strains LL and NG), Serratia liquefaciens, Vibrio anguillarum, Vibrio salmonicida and Yersinia ruckeri type I. Salmo salar fry specimens which were fed Lactobacillus plantarum at dose of 2.5×109 cfu g-1 and infected with Aeromonas salmonicida AL2020 showed a cumulative mortality lower than infected control group [54]. Pseudomonas fluorescens AH2 at doses of 103-105 cfu ml-1 in water did not confer protection against Aeromonas salmonicida in Salmo salar specimens [55]. It has been also reported in vitro that the pathogen Vibrio anguillarum LFI1243 showed a complete inhibition of growth in presence of Carnobacterium divergens strains [56]. This is in accordance with another study showing that Carnobacterium sp. isolated from salmon inhibited the growth of both Vibrio anguillarum and Aeromonas salmonicida in intestinal fish mucus [57]. Interestingly, Carnobacterium divergens isolated from Salmo salar specimens were also tested as fed probiotics in atlantic cod (Gadus morhua) specimens which showed lower mortalities.

The most studied fish specie regarding the potential benefits of probiotics is the rainbow trout (Oncorhynchus mykiss). In vitro studies have demonstrated the competitive adhesion and production of antagonistic compounds by some lactic acid bacteria (Lactococcus lactis ssp. lactis CLFP100, Lactococcus lactis ssp. cremoris CLFP102 and Lactobacillus curvatus CLFP150) against fish pathogens, including Aeromonas salmonicida ssp. salmonicida CLFP 501, Carnobacterium piscicola CLFP 601, Lactococcus garvieae CLFP LG1, Vagococcus salmoninarum CLFP 602, Yersinia ruckeri ATCC 29473 and Vibrio anguillarum La192 [58]. In another in vitro assay authors checked the inhibitory effect of Carnobacterium sp. and Pseudomonas sp. isolated from gut of rainbow trout against Vibrio anguillarum, although there was no correlation with the in vivo study since the same probiotic failed to protect them against Vibrio anguillarum infection [59]. In rainbow trout specimens fed 107 cfu g-1 of four putative probiotics (Aeromonas hydrophila, Vibrio fluvialis, Carnobacterium sp. and an unidentified coccus) showed a better survival after intraperitoneal injection of Aeromonas salmonicida [60]. However, the same dietary doses of Carnobacterium inhibens and Vibrio alginolyticus conferred a lower protection against Aeromonas salmonicida. These results were correlated with other two studies [52, 61]. In rainbow trout fingerlings, the same four putative probiotics seen previously [60] but administered as formaline-inactivated bacteria showed a lower mortality (4%, 4%, 8% and 0%, respectively) after challenge with Aeromonas salmonicida [62] suggesting that the use of dead probiotics has also many benefits for fish. Dietary administration of lactic acid bacteria (Lactococcus lactis ssp. lactis CLFP 100, Leuconostoc mesenteroides CLFP 196, and Lactobacillus sakei CLFP 202) at doses of 106 cfu g-1 for 2 weeks showed a survival rate of 97.8%-100% (versus 65.6% in the control group) when trout specimens were challenged with Aeromonas salmonicida ssp. salmonicida CLFP 501 [63]. It has been reported that dietary supplementation with Bacillus sp. JB-1 and Aeromonas sobria GC2 at doses of 2×108 and 107 cfu g-1, respectively for two weeks led to a higher survival rates in trout after challenge with Streptococcus iniae and Lactococcus garvieae at doses of 2×107 cfu ml-1, and Vibrio anguillarum, Vibrio ordalii, Aeromonas salmonicida and Yersinia ruckeri at doses of 3×108 cfu ml-1 [64]. Thus, survival rates in specimens fed control diets were 0%-20% whereas in specimens fed probiotic-diets survival rate was 100% in all treatments (with JB-1 and GC2) with all pathogens bacteria except for Vibrio anguillarum (87% and 94% respectively) and Yersinia ruckeri (94% in GC2 diet). In other study it has been found that dietary administration of Aeromonas sobria GC2 at dose of 108 cfu g-1 and Brochothrix thermosphasta BA211 at dose of 1010 cfu g-1 for two weeks showed a higher survival rate (76% and 88%) than in control group (22%) after intramuscular injection with Aeromonas bestiarum ORN2 [65]. In the same experiment, it was demonstrated that GC2 probiotic exerts resistance also against ichthyophthiriasis (caused by the parasite Ichthyophthirius multifiliis) however BA211 strain had no effect against this pathogen. An in vitro assay tested the inhibitory ability of Lactobacillus plantarum strains, Lactococcus lactis strains and Leuconostoc mesenteroides strains against Lactococcus garvieae CLFP LG1 [66]. Other research [67] reported that rainbow trout specimens fed Lactobacillus rhamnosus ATCC 53103 at doses of 109 and 1012 cfu g-1 for fifty-one days obtained a reduced mortality (18.9% and 46.3%, respectively) compared with the control group (52.6%) when were infected with Aeromonas salmonicida ssp. salmonicida. An in vivo assay against lactococcosis, dietary administration with lactic acid bacteria (Leuconostoc mesenteroides CLFP 196, and Lactobacillus plantarum CLFP 238) at doses of 106 cfu g-1 for four weeks showed a decrease in cumulative mortality (46% and 54%) compared with the control group (78%) in trout specimens after injection with Lactococcus garvieae [68]. Following with the development of protection in rainbow trout, specimens were fed a supplemented diet with 108 cfu g-1 of Kokuria SM1 for four weeks and after replacement for control diet they were infected with Vibrio anguillarum every week [69]. Interestingly, this relative protection was maximum (87%) just after the end of the probiotic-supplemented diet that was disappearing with the time and was of 71%, 68%, 62% and 36% after two, three, four and five weeks after cessation of probiotic, respectively, representing a sign of gradual loss of effect [70, 71]. In other research, O. mykiss specimens exposed to Pseudomonas fluorescens AH2 at 105 cfu ml-1 for 5 days or added in situ when challenged with Vibrio anguillarum showed a higher survival ratio (56% and 65%, respectively) than specimens exposed to Vibrio anguillarum without probiotic (50%) [72]. Dietary administration of BioPlus2B, wich contains two probiotic bacteria (Bacillus subtilis and Bacillus licheniformis) for four weeks resulted in a better survival ratio (41.7%) compared with Ergosan-diet (8.9%) and control diet (9%) in trout specimens after intraperitoneal injection of Yersinia ruckeri [73]. Following with the protection against yersiniosis, dietary administration of 108 cfu g-1 of Enterobacter cloacae and Bacillus mojavensis separately for two months achieved a high survival ratio (99.2%) compared with the control group (35%) when infected with Yersinia ruckeri [74]. In addition, in other research, dietary administration of 107 cfu g-1 of Carnobacterium maltaromaticum B26 and Carnobacterium divergens B33 separately for two weeks conferred protection against Yersinia ruckeri with a high survival ratio of 73% and 80% respectively, compared with the control group (13%); and the same probiotics (B26 and B33) also provided protection against Aeromonas salmonicida with a survival ratio of 80% in both cases compared with the control group (20%) [75]. Flavobacterium psychrophilum is the causative agent of coldwater disease (CWD), also known as rainbow trout fry syndrome (RTFS). Although many types of salmonids are susceptible to RTFS, rainbow trout can be especially impacted due to direct mortality or deformities in surviving specimens leading to economic losses in aquaculture [76, 77]. In order to establish strategies of resistance against CWD with probiotics, in two studies [78, 79] it was demonstrated the ability of Pseudomonas sp. M174 and M162 to inhibit Flavobacterium psychrophilum in vitro. In addition, others in vivo experiments, rainbow trout specimens fed supplemented diet with Pseudomonas sp. M174 (at 4×106) and M162 (at doses of 5×107-2×109 cfu g-1) showed a decrease in cumulative mortality after infection with Flavobacterium psychrophilum JIP02/86. Thus, cumulative mortality was 41% in the M174-diet group, 35% in the M162-diet group, and 57% in control groups. In an interesting study, oral vaccines with formalin-killed Streptococcus iniae Dan-1 at doses of 3×1011 cfu ml-1 were inoculated in Oncorhynchus mykiss specimens provided them protection against Streptococcus iniae virulent at doses of 105 cfu ml-1 until six months later. The survival ratio was 90% in the treated group and 20% in the control group [80]. As seen in the vast literature the benefits of many probiotics in the culture of rainbow trout is achieved. Furthermore, some papers also demonstrate that probiotics do not need to be alive exclusively. Thus, trout specimens fed supplemented diet with inactivated Enterococcus faecalis at dose of 5g kg-1 feed showed lower cumulative mortality (40%) than the control group (83%) after challenge with Aeromonas salmonicida [81]. Other probiotic forms of Bacillus subtilis AB1 such as live cells, sonicated cells, formaline-dead cells and cell-free supernatant were applied as supplement in diets to rainbow trout specimens which achieved a survival of 100% in all forms of probiotic-treatments whereas the survival in control groups was 10-15% after intraperitoneal injection with a pathogenic Aeromonas sp. [82].

Other trout species have been slightly evaluated. Thus, brown trout (Salmo trutta) specimens fed diets containing lactic acid bacteria (Lactococcus lactis ssp. lactis CLFP 100 or Leuconostoc mesenteroides CLFP 196) at doses of 106 cfu g-1 for four weeks separately, reduced the cumulative mortality after challenge with Aeromonas salmonicida from 37% in the control group to 15% and 9%, respectively. [83]. In the case of brook trout (Salvelinus fontinalis), specimens exposed to four potential probiotics (S1, S5, S9 and S10) separately at doses of 105 cfu ml-1 and one pathogen (Flavobacterium columnare) showed a higher survival ratio than specimens exposed to Flavobacterium columnare (without probiotics) being S9 the most successful with a cumulative mortality of only 4% [84].

Edwardsiellosis, a bacterial septicaemia caused by the Gram-negative bacterium Edwardsiella tarda, is one of the most serious bacterial diseases in cultured eels [85]. So, in a study with European eel (Anguilla anguilla), dietary administration with Enterococcus faecium SF68 from Cernivet® and Bacillus toyoi from Toyocerin® for 2 weeks was followed by challenge with Edwardsiella tarda 981210L1. Bacillus toyoi did not protected against Edwardsiellosis whilst Enterococcus faecium SF68 showed higher rate of survival (73%) compared with the control (45%). In the resistance of Nile tilapia (Oreochromis niloticus) against edwardsiellosis, dietary administration of a commercial mix of probiotics that contained Lactobacillus acidophilus (1.2×108 cfu g-1), Bacillus subtilis (1.6×107 cfu g-1), Clostridium butyricum (2×107 cfu g-1) and Saccharomyces cerevisiae (1.6×107 cfu g-1) for 30 days following infection with Edwardiella tarda, provided a cumulative mortality lower than positive control group [86]. Recently, it has been also reported [87] that dietary supplementation of 108 cfu g-1 of Lactobacillus pentosus PL11 in Japanese eel (Anguilla japonica) challenged with Edwardsella tarda showed an increase in growth performance compared with the control group. In the case of rock bream (Oplegnathus fasciatus) it has been also shown that dietary supplementation with 2.2×107 cfu g-1 of Lactobacillus sakei BK19 and challenged with Edwardsiella tarda produced a non-significant decrease in the cumulative mortality [88].

Dietary supplementation of different species of Bacillus sp., Lactobacillus sp., Streptococcus faecium and Saccharomyces cerevisae had no effect in survival ratio of ornamental fishes (Carassius auratus and Xiphophorus helleri) specimens after challenge with Pseudomonas fluorescens 58C [89]. However, other study with Carassius auratus fed a supplemented diet of formalin-inactivated Aeromonas hydrophila A3-51 for twenty days showed a decrease in cumulative mortality compared with the control group after infection with Aeromonas salmonicida [90].

African catfish (Clarias gariepinus) juvenile specimens were fed a commercial diet supplemented with 3×107 cfu g-1 of Lactobacillus acidophilus for 12 weeks. Then, fish were intraperitoneally injected with 2×106 cfu ml-1 of Staphylococcus xylosus, Aeromonas hydrophila gr2 and Streptococcus agalactiae separately [91]. At one week post infection, the fish survival rate in control group and in infected groups treated with probiotic diet was 100%, whilst in the groups infected with Staphylococcus xylosus, Aeromonas hydrophila gr2 and Streptococcus agalactiae fed the non-probiotic diet, fish survival recorded was 83.3%, 76.6% and 80.0% respectively.

Olive flounder (Paralichthys olivaceus) specimens fed supplemented diet with Bacillus subtilis, Bacillus pumilus and Bacillus licheniformis, separately and at doses 1010 cfu g-1 for eight weeks showed a higher survival ratio in the case of Bacillus subtilis and Bacillus pumilus (97.3% and 98.7%, respectively) than specimens in the control group (77.3%) after immersion with Streptoccocus iniae [92]. For Bacillus licheniformis diet, specimens did not show statistically significant differences in survival ratio (86.7%) compared with the control group (77.3%). In another study, Paralichthys olivaceus specimens were fed a diet containing 3.4×104 (low dose), 3.5×106 (medium dose) and 3.4×108 cfu ml-1 (high dose) of Zooshikella sp. JE-34 and challenged with Streptococcus iniae showed their mortality reduced from 85 to htose of the controls 25-40% [93].

Chinese drum (Miichthys miiuy) specimens were also fed commercial diet supplemented with 108 cfu g-1 of Clostridium botyricum CB2 in the form of alive cells (CB) or dead cells (D-CB) for 30 days and then challenged with Vibrio anguillarum and Aeromonas hydrophila, separately. Result showed that survival in chinese drum specimens increased in both groups of probiotic diet compared with the control for both pathogen bacteria [94]. These results are according to other study [95] which demonstrated that dietary administration of Clostridium botyricum in rainbow trout (Oncorhynchus mykiss) achieved resistance against vibriosis.

Tropical freshwater fish (Labeo rohita) specimens were fed a supplemented diet with 0.5×107, 107 or 1.5×107 cfu g-1 of Bacillus subtilis for two weeks. After challenge by intraperitoneal injection of Aeromonas hydrophila O:18, specimens showed increased serum bactericidal activity and granulocyte numbers in probiotic-fed groups compared with the control group [96]. In other work [97] it has been reported that L. rohita specimens fed dietary supplementation with 106, 108 or 1010 cfu g-1 of Lactobacillus plantarum VSG3 for two months showed a higher survival rate (37%, 77% and 63%, respectively) than the control group (14%) after injection of Aeromonas hydrophila. In addition, dietary supplementation of 107 or 109 cfu g-1 of Pseudomonas aeruginosa VSG-2 for two months showed a higher survival rate (66% and 55%, respectively) than in the control group (11%) after injection with Aeromonas hydrophila MTCC1739. So, the appropriate administration dose was 107 cfu g-1 of Pseudomonas aeruginosa VSG-2 and 108 cfu g-1 of Lactobacillus plantarum VSG-3 which achieved the better survival rate (66% and 77%, respectively) after challenge with Aeromonas hydrophila MTCC1739 [97, 98], demonstrating that probiotics are only effective when administered in adequate doses.

Turbot (Scophthalmus maximus) larvae specimens fed rotifers enriched with Lactobacillus plantarum and Carnobacterium sp. at doses of 107-2×107 cfu ml-1 showed a higher survival ratio (53%) than specimens fed rotifers without probiotics (8%) [99]. Similarly, larvae specimens exposed to Roseobacter sp. strain 27-4 at dose of 107 cfu ml-1 showed a significant decrease in cumulative mortality compared with control larvae specimens. In addition, this Roseobacter sp. strain 27-4 was previously tested as antagonist to Vibrio anguillarum [100]. When specimens were fed rotifers enriched with Roseobacter sp. strain 27-4 and infected with Vibrio anguillarum, achieved a decrease in cumulative mortality compared with specimens only infected [101]. It was demonstrated in an in vitro assay that Phaeobacter sp. and Ruegeria sp. are also potential probiotics against Vibrio anguillarum in turbot [102].

Gilthead seabream (Sparus aurata) specimens were fed a commercial diet supplemented with 108 cfu g-1 of Shewanella putrefaciens (Pdp11) for 15 days and challenged with 3.7×107 cfu ml-1 of Vibrio anguillarum DC11R2a [103]. The mortality of the fish which receiving the diet supplemented with the potential probiotic Pdp11 was 10%, lower than the mortality of the fish that received the control diet (56%).

In other works [104, 105] it has been described the effect of the dietary administration of 109 cfu g-1 of Shewanella putrefaciens (Pdp11) and Shewanella baltica (Pdp13) to sole (Solea senegalensis) against Photobacterium damselae ssp. piscicida. The mortality decreased after one and two months with dietary administration of both bacteria compared with the control diet.

In european seabass (Dicentrarchus labrax) juvenile specimens, it has been demonstrated that dietary intake of Artemia with an acid lactic bacteria (Lactobacillus delbrueckii ssp. delbrueckii) improved growth of specimens [106]. Dietary administration of 109 cfu g-1 of Vagococcus fluvialis during 20 days in adults resulted in a mortality of 17.3% while in control group (without probiotic) was 30% after exposure to Vibrio anguillarum 975-1 [107].

7. Conclusions

Probiotics are usually live microorganisms that administered at adequate doses confer health benefits to the host. In this review we have focused only in those probiotics conferring protection to shellfish and fish species important for the aquaculture against viral and bacterial diseases. Some of the main conclusions are summarized below:

  • The most studied probiotics are usually Bacillus and Lactobacillus species.

  • Dietary administration of probiotics is the preferred for the researchers and farmers. However, bioencapsulation through Artemia might be considered a good solution, mainly at larval stages.

  • Most of the studies have used live bacteria but other forms such as inactivated, killed, homogenized or even supernatants have also presented good probiotic properties.

  • Bacteria are the most known probiotics but other microorganisms such as yeast or microalgae are also suitable and good candidates.

  • Although probiotics have probed protection against pathogenic bacteria further evaluation of their potential against virus and parasites is deserved.

  • The concentration of the administered probiotic is essential and needs to be optimized for every situation.

  • The time of administration is also a very important factor and periods of 2 to 4 weeks of dietary administration seem to be the optimal.

  • Only a few potential probiotics tested in vitro become in effective probiotics in vivo and in commercial probiotics.

Further studies are still necessary to increase our knowledge about the use of probiotics to control bacterial infections in shellfish and fish but much more efforts are needed in the case of viral diseases. This is an important issue for the aquaculture industry that is continuously growing due to the fish and shellfish demand for human consume. Apart from the discovery of new or better probiotic formulations, improvement of their benefits may be helpful. Thus, better and cheaper production methods, administration ways or combination with other preventive/therapeutic measures are welcomed.


H. Cordero wishes to thank the Ministerio de Economía y Competitividad (MINECO) for a F.P.I. fellowship. This work has been funded by grants AGL2010-20801-C02-02 (MINECO and FEDER), AGL2011-30381-C03-01 (MINECO) and 04538/GERM/06 (Fundación Séneca, Grupo de Excelencia de la Región de Murcia).


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50 - Reyes-Becerril M, Tovar-Ramírez D, Ascensio-Valle F, Civera-Cerecedo R, Gracia-López V, Barbosa-Solomieu V, Esteban MA. Effects of Dietary Supplementation with Probiotic Live Yeast Debaromyces hansenii on the Immune and Antioxidant System of Leopard Grouper Mycteroperca rosacea Infected with Aeromonas hydrophila. Aquaculture Research 2011;42 1676-1686.
51 - Abu-Elala N, Marzouk M, Moustafa M. Use of Different Saccharomyces cerevisiae Biotic Forms as Immune-Modulator and Growth Promoter for Oreochromis niloticus Challenged with Some Fish Pathogens. International Journal of Veterinary Science and Medicine 2013;1 21-29.
52 - Austin B, Stuckey LF, Robertson PAW, Effendi I, Griffith DRW. A Probiotic Strain of Vibrio alginolyticus Effective in Reducing Diseases Caused by Aeromonas salmonicida, Vibrio anguillarum and Vibrio ordalii. Journal of Fish Diseases 1995;18 93-96.
53 - Austin B, Baudet E, Stobie M. Inhibition of Bacterial Fish Pathogens by Tetraselmis suecica. Journal of Fish Diseases 1992;15 55-61.
54 - Gildberg A, Johansen A, Jar B. Growth and Survival of Atlantic Salmon (Salmo salar) Fry Given Diets Supplemented with Fish Protein Hydrolysate and Lactic Acid Bacteria during a Challenge Trial with Aeromonas salmonicida. Aquaculture 1995;138 23-34.
55 - Gram L, Løvold T, Nielsen J, Melchiorsen J, Spanggaard B. In Vitro Antagonism of the Probiont Pseudomonas fluorescens Strain AH2 against Aeromonas salmonicida Does Not Confer Protection of Salmon against Furunculosis. Aquaculture 2001;199 1-11.
56 - Gildberg A, Mikkelsen H. Effects of Supplementing the Feed of Atlantic Cod (Gadus morhua) Fry with Lactid Acid Bacteria and Immunostimulating Peptides during a Challenge Trial with Vibrio anguillarum. Aquaculture 1998;169 103-113.
57 - Jöborn A, Dorsch M, Olsson ZJC, Westerdahl A, Kjelleberg S. Carnobacterium inhibens sp. Nov., Isolated from the Intestine of Atlantic Salmon (Salmo salar). International Journal of Systematic Bacteriology 1999;49 1891-1898.
58 - Balcázar JL, De Blas I, Ruiz-Zarzuela I, Vendrell D, Gironés O, Muzquiz JL. In Vitro Competitive Adhesion and Production of Antagonistic Compounds by Lactic Acid Bacteria against Fish Pathogens. Veterinary Microbiology 2007b;122 373-380.
59 - Spanggaard B, Huber I, Nielsen J, Sick EB, Pipper CB, Martinussen T, Slierendrecht WJ, Gram L. The Probiotic Potential against Vibriosis of the Indigenous Microflora of Rainbow Trout. Environmental Microbiology 2001;3 755-765.
60 - Irianto A, Austin B. Use of Probiotics to Control Furunculosis in Rainbow Trout (Oncorhynchus mykiss, Walbaum). Journal of Fish Diseases 2002;25 333-342.
61 - Robertson PAW, O’Dowd C, Burrells C, William P, Austin B. Use of Carnobacterium sp. as a Probiotic for Atlantic Salmon (Salmo salar L.) and Rainbow Trout (Oncorhynchus mykiss, Walbaum). Aquaculture 2000;185 235-243.
62 - Irianto A, Austin B. Use of Dead Probiotic Cells to Control Furunculosis in Rainbow Trout, Oncorhynchus mykiss (Walbaum). Journal of Fish Diseases 2003;26 59-62.
63 - Balcázar JL, De Blas I, Ruíz-Zarzuela I, Cunningham D, Vendrell D, Gironés O, Múzquiz JL. Enhancement of the Immune Response and Protection Induced by Probiotics Lactic Acid Bacteria against Furunculosis in Rainbow Trout (Oncorhynchus mykiss). FEMS Immunology and Medical Microbiology 2007;51 185-193.
64 - Brunt J, Newaj-Fyzul A, Austin B. The Development of Probiotics for the Control of Multiple Bacterial Diseases of Rainbow Trout (Oncorhynchus mykiss, Walbaum). Journal of Fish Diseases 2007; 30 573-579.
65 - Pieters N, Brunt J, Austin B, Lyndon AR. Efficacy of In-Feed Probiotics against Aeromonas bestiarum and Ichthyophthirius multifiliis Skin Infections in Rainbow Trout (Oncorhynchus mykiss, Walbaum). Journal of Applied Microbiology 2008;105 723-732.
66 - Pérez-Sánchez T, Balcázar JL, Garcia Y, Halaihel N, Vendrell D, De Blas I, Merrifield DL, Ruíz-Zarzuela I. Identification and Characterization of Lactic Acid Bacteria Isolated from Rainbow Trout, Oncorhynchus mykiss (Walbaum), with Inhibitory Activity against Lactococcus garvieae. Journal of Applied Microbiology 2011;34 499-507.
67 - Nikoskelainen S, Ouwehand A, Salminen S. Protection of Rainbow Trout (Oncorhynchus mykiss) from Furunculosis by Lactobacillus rhamnosus. Aquaculture 2001;198 229-236.
68 - Vendrell D, Balcázar JL, de Blas I, Ruiz-Zarzuela I, Gironés O, Múzquiz JL. Protection of Rainbow Trout (Oncorhynchus mykiss) from Lactococcosis by Probiotic Bacteria. Comparative Immunology, Microbiology and Infectious Diseases 2008;31 337-345.
69 - Sharifuzzaman SM, Austin B. Influence of Probiotic Feeding Duration on Disease Resistance and Immune Parameters in Rainbow Trout. Fish and Shellfish Immunology 2009;27 440-445.
70 - Sharifuzzaman SM, Austin B. Kocuria SM1 Controls Vibriosis in Rainbow Trout (Oncorhynchus mykiss, Walbaum). Journal of Applied Microbiology 2010;108 2162-2170.
71 - Sharifuzzaman SM, Austin B. Development of Protection in Rainbow Trout (Oncorhynchus mykiss) to Vibrio anguillarum Following Use of the Probiotic Kocuria SM1. Fish and Shellfish Immunology 2010;29 212-216.
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73 - Raida MK, Larsen JL, Nielsen ME, Buchmann K. Enhanced Resistance of Rainbow Trout, Oncorhynchus mykiss (Walbaum), against Yersinia ruckeri Challenge Following Oral Administration of Bacillus subtilis and Bacillus licheniformis (BioPlus2B). Journal of Fish Diseases 2003;26 495-498.
74 - Capkin E, Altinok I. Effects of Dietary Probiotic Suplementations on Prevention/Treatment of Yersiniosis Disease. Journal of Applied Microbiology 2006;106 1147-1153.
75 - Kim DH, Austin B. Innate Immune Responses in Rainbow Trout (Oncorhynchus mykiss, Walbaum) Induced by Probiotics. Fish and Shellfish Immunology 2006;21 513-524.
76 - Nematollahi A, Decostere A, Pasmans F, Haesebrouck F. Flavobacterium psycrophilum Infections in Salmonid Fish. Jornal of Fish Diseases 2003;26 563-574.
77 - Starliper CE. Bacterial Coldwater Disease of Fishes Caused by Flavobacterium psychrophilum. Journal of Advanced Research 2011;2 97-108.
78 - Korkea-aho TL, Papadopoulou A, Heikkinen J, Von Wright A, Adam A, Austin B, Thompson KD. Pseudomonas M162 Confers Protection against Rainbow Trout Fry Syndrome by Stimulating Immunity. Journal of Applied Microbiology 2012;113 24-35.
79 - Korkea-aho TL, Heikkinen J, Thompson KD, Von Wright A, Austin B. Pseudomonas sp. M174 Inhibits the Fish Pathogen Flavobacterium psycrophilum. Journal of Applied Microbiology 2011;111 266-277.
80 - Eldar A, Horovitcz A, Bercovier H. Development and Efficacy of a Vaccine against Streptococcus iniae Infection in Farmed Rainbow Trout. Veterinary Immunology and Immunopathology 1997;56 175-183.
81 - Rodríguez-Estrada U, Satoh S, Haga Y, Fushimi H, Sweetman J. Effects of Inactivated Enterococcus faecalis and Mannan Oligosaccharide and their Combination on Growth, Immunity, and Disease Protection in Rainbow Trout. North American Journal of Aquaculture 2013;75 416-428.
82 - Newaj-Fyzul A, Adesiyun AA, Mutani A, Ramsubhag A, Brunt J, Austin B. Bacillus subtilis AB1 Controls Aeromonas Infection in Rainbow Trout (Oncorhynchus mykiss, Walbaum). Journal of Applied Microbiology 2007;103 1699-1706.
83 - Balcázar JL, Vendrell D, de Blas I, Ruiz-Zarzuela I, Múzquiz JL. Effect of Lactococcus lactis CLFP100 and Leuconostoc mesenteroides CLFP 196 on Aeromonas salmonicida Infection in Brown Trout (Salmo trutta). Journal of Molecular Microbiology and Biotechnology 2009;17 153-157.
84 - Boutin S, Bernatchez L, Audet C, Derôme N. Antagonistic Effect of Indigenous Skin Bacteria of Brook Charr (Salvelinus fontinalis) against Flavobacterium columnare and F. psychrophilum. Veterinary Microbiology 2012;155 355-361.
85 - Chang C, Liu W. An Evaluation of Two Probiotic Bacterial Strain, Enteroccocus faecium SF68 and Bacillus toyoi, for Reducing Edwardsiellosis in Cultured European Eel, Anguilla anguilla L. Journal of Fish Diseases 2002;25 311-315.
86 - Taoka Y, Maeda H, Jo J, Kim SM, Park SI, Yoshikawa T, Sakata T. Use of Live and Dead Probiotic Cells in Tilapia Oreochromis niloticus. Fisheries Science 2006;72 755-766.
87 - Lee JS, Cheng H, Lee SJ, Kim JC, Rhee MH, Suh JW, Park SC. Effects of Dietary Supplementation of Lactobacillus pentosus PL11 on the Growth Performance, Immune and Antioxidant Systems of Japanese Eel Anguilla japonica Challenged with Edwardsiella tarda. Fish and Shellfish Immunology 2013;34 756-761.
88 - Harikrishnan R, Kim MC, Kim JS, Balasundaran C, Heo MS. Protective Effect of Herbal and Probiotics Enriched Diet on Haematological and Immunity Status of Oplegnathus fasciatus (Temminck and Schlegel) against Edwarsiella tarda. Fish and Shellfish Immunology 2011;30 886-893.
89 - Abraham TJ, Mondal S, Babu CS. Effect of Commercial Probiotic and Fish Gut Antogonistic Bacterial Flora on the Growth and Disease Resistance of Ornamental Fishes Carassius auratus and Xiphophorus helleri. Journal of Fisheries and Aquatic Sciences 2008;25 27-30.
90 - Irianto A, Robertson PAW, Austin B. Oral Administration of Formaline-Inactivated Cells of Aeromonas salmonicida A3-51 Controls Infection by Atypical A. salmonicida in Goldfish, Carassius auratus (L.). Journal of Fish Diseases 2003;26 117-120.
91 - Al-Dohail MA, Hashim R, Aliyu-Paiko M. Evaluating the Use of Lactobacillus acidophilus as a Biocontrol Agent against Common Pathogenic Bacteria and the Effects on the Haematology Parameters and Histopathology in African Catfish Clarias gariepinus Juveniles. Aquaculture Research 2011;42 196-209.
92 - Cha JH, Rahimnejad S, Yang SY, Kim KW, Lee KJ. Evalutations of Bacillus spp. as Dietary Additives on Growth Performance, Innate Immunity and Disease Resistance of Olive Flounder (Paralichthys olivaceus) against Streptococcus iniae and as Water Additives. Aquaculture 2013;402 50-57.
93 - Kim JS, Harikrishnan R, Kim MC, Balasundaram C, Heo MS. Dietary Administration of Zooshikella sp. to Enhance the Innate Immune Response and Disease Resistance of Paralichthys olivaceus against Streptococcus iniae. Fish and Shellfish Immunology 2010;29 104-110.
94 - Pan X, Wu T, Song Z, Tang H, Zhao Z. Immune Responses and Enhanced Diseases Resistance in Chinese Drum, Miichthys miiuy (Basilewsky), After Oral Administration of Live or Dead Cells of Clostridium butyricum CB2. Journal of Fish Diseases 2008;31 679-686.
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96 - Kumar R, Mukherjee SC, Ranjan R, Nayak SK. Enhanced Innate Immune Parameters in Labeo rohita (Ham.) Following Oral Administration of Bacillus subtilis. Fish and Shellfish Immunology 2008;24 168-172.
97 - Giri SS, Sukumaran V, Oviya M. Potential Probiotic Lactobacillus plantarum VSG3 Improves the Growth, Immunity, and Disease Resistance of Tropical Freshwater Fish, Labeo rohita. Fish and Shellfish Immunology 2013;34 660-666.
98 - Giri SS, Sen SS, Sukumaran V. Effects of Dietary Supplementation of Potential Probiotic Pseudomonas aeruginosa VSG-2 on the Innate Immunity and Disease Resistance of Tropical Freswater Fish, Labeo rohita. Fish and Shellfish Immunology 2012;32 1135-1140.
99 - Gatesoupe FJ. The Use of Probiotics in Aquaculture. Aquaculture 1999;180 147-165.
100 - Hjelm M, Bergh O, Riaza A, Nielsen J, Melchiorsen J, Jensen S, Duncan H, Ahrens P, Birkberk H, Gram L. Selection and Identification of Autochthonous Potential Probiotic Bacteria from Turbot Larvae (Scophthalmus maximus) Rearing Units. Systematic and Applied Microbiology 2004;27 360-371.
101 - Planas M, Pérez-Lorenzo M, Hjelm M, Gram L, Fiksdal IU, Bergh O, Pintado J. Probiotic Effect In Vivo of Roseobacter Strain 27-4 against Vibrio (Listonella) anguillarum Infections in Turbot (Scophthalmus maximus) Larvae. Aquaculture 2006;255 223-233.
102 - Porsby CH, Nielsen KF, Gram L. Phaeobacter and Ruegeria Species of the Roseobacter Clade Colonize Separate Niches in a Danish Turbot (Scophthalmus maximus)-Rearing Farm and Antagonize Vibrio anguillarum under Different Growth Conditions. Applied and Environmental Microbiology 2008;74 7356-7364.
103 - Chabrillón M, Arijo S, Díaz-Rosales P, Balebona MC, Moriñigo MA. Interference of Listonella anguillarum with Potential Probiotic Microorganisms Isolated from Farmed Gilthead Seabream (Sparus aurata L.). Aquaculture Research 2006;37 78-86.
104 - García De La Banda I, Lobo C, León-Rubio JM, Tapia-Paniagua S, Balebona MC, Moriñigo MA, Moreno-Ventas X, Lucas LM, Linares F, Arce F, Arijo S. Influence of Two Closely Related Probiotics on Juvenile Senegalese Sole (Solea senegalensis, Kaup 1858) Performance and Protection against Photobacterium damselae ssp. piscicida. Aquaculture 2010;306 281-288.
105 - Díaz-Rosales P, Arijo, S, Chabrillón M, Alarcón, FJ,Tapia-Paniagua ST, Martínez-Manzanares E, Balebona MC, Moriñigo MA. Effects of Two Closely Related Probiotics on Respiratory Burst Activity of Senegalese Sole (Solea senegalensis, Kaup) Phagocytes, and Protection against Photobacterium damselae ssp. piscicida. Aquaculture 2009;293 16-21.
106 - Carnevali O, De Vivo L, Sulpizio R, Gioacchini G, Olivotto I, Silvi S, Cresci A. Growth Improvement by Probiotic in European Sea Bass Juveniles (Dicentrarchus labrax L.), with Particular Attention to IGF-1, Myostatin and Cortisol Gene Expression. Aquaculture 2006;258 430-438.
107 - Sorroza L, Padilla D, Acosta F, Román L, Grasso V, Vega J and Real F. Characterization of the Probiotic Strain Vagacoccus fluavialis in the Protection of European Sea Bass (Dicentrarchus labrax) against Vibriosis by Vibrio Anguillarum. Veterinary Microbiology 2012;155 369-373.
108 - Planas M, Pérez-Lorenzo M, Vázquez, Pintado J. A Model for Experimental Infections with Vibrio (Listonella) anguillarum in First Feeding Turbot (Scophthalmus maximus L.) Larvae under Hatchery Conditions. Aquaculture 2005;250 232-243.
109 - Cerezuela R, Guardiola FA, Meseguer J, Esteban MA. Increases in Immune Parameters by Inulin and Bacillus subtilis Dietary Administration to Gilthead Seabream (Sparus aurata L.) Did Not Correlate with Disease Resistance to Photobacterium damselae. Fish and Shellfish Immunology 2012;32 1032-1040.