Étude du régime alimentaire de deux souches de truite arc-en-ciel marocaine et bulgare dans deux plans d'eau du Moyen-Atlas Amghass I et Amghass II

Abstract

The environments of study are two stretches of water in the «Moyen-Atlas» (Amghass I and Amghass II), which présent water of good physical and chemical quality and are of quite important biological diversity.To détermine the dietary préférences of the two species, we evaluated several parameters: the dietary spectrum which is determined by the relative abundance and the coefficient of occurence of ingested prey, the index alimentary of Lauzanne for the différent catégories of prey and how predatory the trout are.The results hâve shown a similarity in the level of dietary régimes of the two populations outlined by a clear préférence for larvae and nymph insects which are considered to be essential prey. RÉSUMÉ