Bacterial microflora in the gastro-intestinal tract of Dover sole (Solea solea L.), with emphasis on the possible role of bacteria in the nutrition of the host |
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Authors: | N.L. MacDonald J.R. Stark B. Austin |
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Affiliation: | Department of Brewing and Biological Sciences, Heriot-Watt University, Chambers Street, Edingburgh EH1 1HX, U.K. |
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Abstract: | Abstract There was a progressive increase in the size of the aerobic heterotrophic bacterial populations along the gastro-intestinal tract of farmed Dover sole. Moreover, higher counts were recorded in juvenile than in adult animals. Thus, in juvenile fish, 5.2 × 105, 8.0 × 105 and 9.8 × 106 aerobic heterotrophs/g were recovered from the stomach/foregut, midgut and hindgut/rectum, respectively. In adult fish, comparative samples revealed the presence of only 3.0 × 104, 7.0 × 104 and 2.3 × 105 bacteria/g, respectively. There bacteria were equated with Acinetobacter, Alcaligenes , Enterobacteriaceae representatives, Flavobacterium, Micrococcus, Photobacterium, Staphylococcus and Vibrio . Of the compounds tested, many isolates, particularly those recovered from the hindgut/rectum, degraded p -nitrophenyl- β - N -acetylglucosaminide, chitin and collagen. Consequently, it is likely that such organisms may contribute to nutritional processes within Dover sole. |
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Keywords: | Bacterial microflora Dover sole gastro-intestinal tract Alcaligenes Acinetobacter Flavobacterium Micrococcus Staphylococcus Vibrio |
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