|The effects of various diets on chitinase and beta-glucosidase activities and the condition of cod Gadus morhua (L.)|
Danulat, E. (1986). The effects of various diets on chitinase and beta-glucosidase activities and the condition of cod Gadus morhua (L.). J. Fish Biol. 28: 191-197
In: Journal of Fish Biology. Fisheries Society of the British Isles: London,New York,. ISSN 0022-1112, more
Diets; Enzymatic activity; Gadus morhua Linnaeus, 1758 [WoRMS]; Marine
Groups of cod, Gadus morhua (L.), were fed exclusively on fish, crustaceans, or crustacean shells for a period of 3 weeks. Chitinase and beta -glucosidase activities were measured in enzyme extracts of stomach contents, stomach tissue, pyloric caeca, intestinal contents, and intestine tissue, and compared to the enzyme activities of control fish starved over the the same period. Fulton's condition factor K, liver lipid content and liver water content were determined to estimate the effects of the diets on the condition of cod. In general, the highest chitinase activities were measured in samples of cod that had been fed on whole crustaceans. Measurements of beta -glucoside activity revealed no similar dependence on food quality.