Effect of dietary starch levels on digestive enzyme activity in Penaeus indicus

Hemambika, M and Paulraj, R (1996) Effect of dietary starch levels on digestive enzyme activity in Penaeus indicus. In: The Fourth Indian Fisheries Forum, Proceedings, 24-28 November, 1996, Kochi.

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Abstract

Purified diets containing graded levels of starch ranging from 0 to40% were prepared and fed to the juveniles of Penaeus indicrrs for a period of 4 weeks. The relative activities of amylases, proteases and lipases were measured in the hepatopancreatic extract. Activity of a-amylase increased with the level of starch in the diet and the maximum substrate turnover of 43.97m rnol Imaltoselmllmin was observed at 20% starch in the diet. However, proteases and lipases did not show any significant variations in their activity patterns. Theeffect of diets on mean live weight gain, digestibility coefficient and survival of prawns were also evaluated. The d.c. value for carbohydrate was the highest (81%) for 20% starch diet. Diets with starch level between 10% and 30% also provided better growth and survival than the other diets. Hence suggest that juveniles of P. indicrrs can digest dietary starch upto a level of 20% and higher level results in lowered d.c.value.

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