Adaptation de la teneur en enzymes digestives de l'hepatopancreas de Palaemon serratus (Crustacea, Decapoda), a la composition d'aliments experimentaux

Abstract

The effects of the carbohydrate and protein composition of compound diets on growth rate and on the amylase and protease content of the hepatopancreas have been studied in Palaemon serratus. The best growth rate for animals weighing between 80 and 380 mg is obtained with a diet containing 3.5% carbohydrate and 64% protein. Diets which are very rich in carbohydrate and poor in protein result in poor growth and high mortality; the same is true for foods containing a high concentration of only one protein. Variations in the wet weight of the hepatopanereas and in the total digestive enzymatic activities are linked to variations in the growth rate of the shrimp. Maximal specific amylase activity is reached when assimilable carbohydrate amounts to 2.8%. Maximal specific protease activity is reached when the food protein level reaches 45%. When the amounts of carbohydrate and protein are higher or lower, the values of specific enzymatic proteins diminish.