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Unilateral exophthalmia, loss of eyes (a), and necrotic lesions around the eyes (arrowed) (b), loss of scales and hemorrhagic ulcerative skin lesion (arrowed) on the body surface (c), accumulation of a clear liquid in the swelled intestine, pale liver, liquefaction of the head kidney (d).
Source publication
Gram Positive Streptococci (GPS) have become increasingly important fish pathogens. In this study, 170 moribund marine fish (sea bass, gilthead sea bream, meagre, sharp snout sea bream, and marine rainbow trout), obtained from 30 fish farms in the Black Sea and Aegean Sea regions of Turkey, were investigated for the presence of GPS. Streptococci we...
Contexts in source publication
Context 1
... farm located in the Aegean region. This disease outbreak occurred in August, following transportation of the cultured meagre juveniles from the hatchery to earthen ponds. The water temperature was 25-26C° and salinity was 30‰ at the time of sampling. Externally moribund meagre samples showed unilateral or bilateral exophthalmia, or loss of eyes (Fig. 1a) and necrotic lesions around the eyes (Fig. 1b), loss of scales, hemorrhagic ulcerative skin lesions on the body surface (Fig. 1c); internally accumulation of a clear liquid in the abdominal cavity and intestine, splenomegaly, pale liver and liquefaction of the head kidney (Fig. 1d). After incubation of the bacteriological inoculations ...
Context 2
... outbreak occurred in August, following transportation of the cultured meagre juveniles from the hatchery to earthen ponds. The water temperature was 25-26C° and salinity was 30‰ at the time of sampling. Externally moribund meagre samples showed unilateral or bilateral exophthalmia, or loss of eyes (Fig. 1a) and necrotic lesions around the eyes (Fig. 1b), loss of scales, hemorrhagic ulcerative skin lesions on the body surface (Fig. 1c); internally accumulation of a clear liquid in the abdominal cavity and intestine, splenomegaly, pale liver and liquefaction of the head kidney (Fig. 1d). After incubation of the bacteriological inoculations from the visceral organs and blood of moribund ...
Context 3
... from the hatchery to earthen ponds. The water temperature was 25-26C° and salinity was 30‰ at the time of sampling. Externally moribund meagre samples showed unilateral or bilateral exophthalmia, or loss of eyes (Fig. 1a) and necrotic lesions around the eyes (Fig. 1b), loss of scales, hemorrhagic ulcerative skin lesions on the body surface (Fig. 1c); internally accumulation of a clear liquid in the abdominal cavity and intestine, splenomegaly, pale liver and liquefaction of the head kidney (Fig. 1d). After incubation of the bacteriological inoculations from the visceral organs and blood of moribund meagre, the isolated bacteria produced small, round and yellowpigmented colonies ...
Context 4
... showed unilateral or bilateral exophthalmia, or loss of eyes (Fig. 1a) and necrotic lesions around the eyes (Fig. 1b), loss of scales, hemorrhagic ulcerative skin lesions on the body surface (Fig. 1c); internally accumulation of a clear liquid in the abdominal cavity and intestine, splenomegaly, pale liver and liquefaction of the head kidney (Fig. 1d). After incubation of the bacteriological inoculations from the visceral organs and blood of moribund meagre, the isolated bacteria produced small, round and yellowpigmented colonies onto TSA. They were non-motile, Gram positive, cocci shaped, pairs or short chains and fermentative, sensitive to vancomycin, alpha-hemolytic, and produced ...
Citations
Gut microbiota play important roles in fish health and growth performance and the microbiome in fish has been shown to be a biomarker for stress. In this study, we surveyed the change of Chinook salmon ( Oncorhynchus tshawytscha ) gut and water microbiota in freshwater recirculating aquaculture systems (RAS) for 7 months and evaluated how gut microbial communities were influenced by fish health and growth performance. The gut microbial diversity significantly increased in parallel with the growth of the fish. The dominant gut microbiota shifted from a predominance of Firmicutes to Proteobacteria, while Proteobacteria constantly dominated the water microbiota. Photobacterium sp. was persistently the major gut microbial community member during the whole experiment and was identified as the core gut microbiota for freshwater farmed Chinook salmon. No significant variation in gut microbial diversity and composition was observed among fish with different growth performance. At the end of the trial, 36 out of 78 fish had fluid in their swim bladders. These fish had gut microbiomes containing elevated proportions of Enterococcus, Stenotrophomonas , Aeromonas, and Raoultella . Our study supports the growing body of knowledge about the beneficial microbiota associated with modern salmon aquaculture systems and provides additional information on possible links between dysbiosis and gut microbiota for Chinook salmon.
