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Effects of sublethal concentrations of lignosulphonates on growth, intestinal flora and some digestive enzymes of rainbow trout (Salmo gairdneri)

, : Effects of sublethal concentrations of lignosulphonates on growth, intestinal flora and some digestive enzymes of rainbow trout (Salmo gairdneri). Aquaculture 12(4): 327-335

Young S. gairdneri were exposed to lignosulfonates (LS [environmental pollutants]) at concentrations of 0, 40, 80, 160, 320, 640, 1280 and 1920 ppm for 35 or 60 days. At concentrations of 160 ppm LS and higher the growth rates were slower. The higher concentrations had the most retarding effect on growth, but a clear general relationship between LS concentration and growth retardation was not observed. The bacterial flora in the digestive tract of the fish was examined. The predominant micro-organisms were flavobacteria, bacilli, streptococci and yeasts (Cryptococcus spp.), which were also isolated from the diet. There were about 10,000 viable aerobic and 1000 anaerobic bacteria/g of intestinal contents. There was no significant difference in quantitative or qualitative composition of the intestinal flora of the different groups. The following groups of digestive enzymes were studied: proteinases, amylases, lipases and DNases. The activities of proteinases and nucleases were significantly impaired in fish exposed to concentrations of 1280 ppm LS and higher, and those of amylases at concentrations of 320 ppm LS and higher. A possible connection between the reduced growth rates and depressed activities of the digestive enzymes is discussed, but no firm conclusion regarding the mechanism by which LS effects fish growth can be made.


DOI: 10.1016/0044-8486(77)90211-3

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