Histochemical Localization of Some Digestive Enzymes in Larval Walleyes

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Abstract
Although larval walleyes (Stizostedion vitreum) readily ingest formulated feeds, survival is low. The present study was conducted to determine if the gut of larval walleyes has digestive capability. Preliminary data indicate that the gut exhibits considerable enzyme activity for four intracellular enzymes—acid phosphatase, alkaline phosphatase, nonspecific esterase, and aminopeptidase—that catalyze the breakdown of a wide variety of organic substances and are capable of digesting many breakdown products of proteins, fats, and carbohydrates. If the digestive system of walleyes becomes functional before the yolk sac is absorbed, as seems likely from the data, problems encountered in feeding formulated feeds to larvae probably do not result from lack of digestive capability.

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