Interactions between fish larvae and bacteria in marine aquaculture

Olafsen, Jan A.

doi:10.1016/s0044-8486(01)00702-5

Cited by 333 publications

(265 citation statements)

References 173 publications

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“…The uneaten food, decomposition of slaughter house and poultry wastes, and accumulation of fish excreta will favour the bacterial growth and, therefore, the higher bacterial counts as evinced by the high counts of viable bacteria (log 6.94±0.20/ml), motile aeromonads (log 6.46±0.38/ml) and pseudomonads (log 4.92±0.53/ml) in rearing water. The results corroborate the findings of Olafsen (2001), who observed an increase in bacterial population in larval rearing because of feeding and excreta accumulation. The levels of MACs (P<0.001) and PPCs (P<0.003) were significantly high in C. gariepinus larvae.…”

Section: Resultssupporting

confidence: 91%

“…Ogbondeminu (1994) recorded high levels of Pseudomonas and Aeromonas from a tropical hatchery producing Clarias anguillaris. Olafsen (2001) reviewed the reports on the isolation of bacteria from slime, external surfaces and intestine of fishes and opined that composition of bacterial groups varies with age, nutritional status and environmental conditions of fish. Further, the prevalence of oxytetracycline resistant bacteria in nursery source water (log 1.70-2.88/ml) of the present study indicated their presence in considerable proportions in water samples even before its use in nursery operation.…”

Section: Resultsmentioning

confidence: 99%

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Oxytetracycline resistant bacteria in Clarias gariepinus and Clarias batrachus larvae and the environment

Bharathkumar¹,

Abraham²

2015

J. Fish.

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batrachus larvae recorded mean counts of log 7.26±0.18/g and log 6.24±0.64/g, log 6.37±0.41/g and log 4.93±0.51/g, log 5.46±0.22/g and log 4.38±0.53/g and, log 6.27±0.64/g and log 5.57±0.12/g, respectively for total viable bacteria (TVCs), motile aeromonads (MACs), presumptive pseudomonads (PPCs) and oxytetracycline resistant bacteria (ARBCs). The levels of TVCs, MACs, PPCs and ARBCs were significantly high in C. gariepinus than in C. batrachus larvae. The rearing water recorded comparatively low bacterial counts than in larvae. The difference between the TVCs of larvae and larval rearing water of C. gariepinus was statistically significant, where as it was insignificant for C. batrachus. The mean proportion of motile aeromonads of C. gariepinus larvae and rearing water was about 4-5 fold higher than in C. batrachus. The catfish nurseries recorded high prevalence of oxytetracycline resistant bacteria ranging from 3.58-35.71% in larval rearing water and 2.05-37.89% in larvae.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Oxytetracycline resistant bacteria in Clarias gariepinus and Clarias batrachus larvae and the environment

Bharathkumar¹,

Abraham²

2015

J. Fish.

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“…intestinal microbiota of these fish larvae may help improve diets and incubation conditions for the intensive mass rearing of healthy fish (Olafsen, 2001). In the present study, the PCR-DGGE fingerprinting technique was used to analyze and compare the composition and structure of the intestinal bacteria and eukaryotic taxa of the four fish larvae.…”

Section: Discussionmentioning

confidence: 99%

Host species as a strong determinant of the intestinal microbiota of fish larvae

et al. 2012

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We investigated the influence of host species on intestinal microbiota by comparing the gut bacterial community structure of four cohabitating freshwater fish larvae, silver carp, grass carp, bighead carp, and blunt snout bream, using denaturing gradient gel electrophoresis (DGGE) of the amplified 16S and 18S rRNA genes. Similarity clustering indicated that the intestinal microbiota derived from these four fish species could be divided into four groups based on 16S rRNA gene similarity, whereas the eukaryotic 18S rRNA genes showed no distinct groups. The water sample from the shared environment contained microbiota of an independent group as indicated by both 16S and 18S rRNA genes segments. The bacterial community structures were visualized using rank-abundance plots fitted with linear regression models. Results showed that the intestinal bacterial evenness was significantly different between species (P<0.05) and between species and the water sample (P<0.01). Thirty-five relatively dominant bands in DGGE patterns were sequenced and grouped into five major taxa: Proteobacteria (26), Actinobacteria (5), Bacteroidetes (1), Firmicutes (2), and Cyanobacterial (1). Six eukaryotes were detected by sequencing 18S rRNA genes segments. The present study suggests that the intestines of the four fish larvae, although reared in the same environment, contained distinct bacterial populations, while intestinal eukaryotic microorganisms were almost identical.

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“…However, the beneficial effects are sometimes temporal, depending on the time of exposure (Verschuere et al, 2000). As most fish contain a specific intestinal microbiota established at the juvenile stage (Olafsen, 2001), the colonization of probiotics to fish intestines requires adequate probiotics presented in ambient microbial community (MC) and their interaction with MC should not be neglected.…”

Section: Studies On Probiotics Quality Control In Aquaculturementioning

confidence: 99%