alexa Influence of age on digestive enzyme activity in some freshwater teleosts


Fermentation Technology

Author(s): VV Kuzmina

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In the fish studied (pike, perch, bream, roach) carbohydrase activity varied more than protease and alkaline phosphatase activity with age. These changes, as a rule, were influenced by changes in fish feeding preference (from initial planktophages to predators and benthophages). In predatory pike, amylolytic, α-amylase and sucrase activity decreased but proteolytic activity increased abruptly at early stages of development. In older age groups of the predator-facultative benthophage perch, carbohydrase activities were lower than those observed in juveniles. In benthophages (bream and roach), amylolytic and α-amylase activities fluctuated but sucrase activity increased with age. Total enzyme activity (activity X total intestinal mucosa weight) in specific cases increased with age. Relative total enzyme activity (g−1 body weight), as a rule, was highest in age 0 + to 3 + fish. For the nutritionist, relative total enzyme activity is a more informative index of the supply of fish digestive enzymes than the standard enzyme activity which is usually reported This article was published in Aquaculture and referenced in Fermentation Technology

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