Distribution and ontogeny of digestive enzymes in ...

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Title Distribution and ontogeny of digestive enzymes in larval yellowtail and winter flounder
Author(s) C. J. Baglole, G. P. Goff, Glenda M. Wright
Journal Journal of Fish Biology
Date 1998
Volume 53
Issue 4
Start page 767
End page 784
Abstract The development of digestive enzyme activity was compared in 2 species of flounders, the yellowtail flounder, Pleuronectes ferruginea, and the winter flounder [Pseudopleuronectes americanus], subjected to 3 feeding regimes (live rotifer and algal diet, weaning onto a compound diet or starvation). Twelve larvae from each of the 3 groups were sampled, 1-2 h after the first feeding of the day, and individually processed for enzyme histochemistry. The results suggest that in the 2 species of pleuronectids examined, digestive enzymes are synthesized and functional during the earliest stage of postembryonic development, the yolk-sac stage. The spatial and temporal distribution of the enzymes, alkaline phosphatase, aminopeptidase M, dipeptidylpeptidase IV and non-specific esterase indicates that the functional segmentation of the digestive tract coincides with the morphological development for optimum nutrient digestion..

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