Utilisation de l'autolysate des déchets de la seiche Sepia officinalis dans l'alimentation du loup Dicentrarchus labrax en aquaculture

Abstract

In order to reduce farming fish food cost, we have studied the substitution effects of an imported raw material (soya-bean) by a local by-product (product made of cuttlefish wastes). The experience carried to this objective consists on elaborating four experimental diets, containing different proportions of this local by-product (0, 5, 10 and 20%), which have been tested on sea-bass. The obtained results after 57 days of the rearing period show that the use of this local by-product in fish food at 10%, induces an increase of the specific growth rate (+22,2%) and of the food conversion index (+15,1%). These physiological gains are expressed in a financial profit evaluated at 15% in feeding cost. These results permit to advance that it is possible to substitute favorably the soya-bean by this local raw material. This alternative product product allows to reduce the fish feeding costs and develop a local by-product