Dietary regime of moroccan and bulgarian rainbow trout in two locations of the Moyen-Atlas (Amghass I and Amghass II) in Morocco
This current work is about the study of the dietary regime of two species of rainbow trout. The Moroccan kind is a cross breed of the European and North American Rainbow trout and the Bulgarian trout introduced into Morocco since 1987. The environments of study are two stretches of water in the "Moyen-Atlas" (Amghass I and Amghass II), which present water of good physical and chemical quality and are of quite important biological diversity. To determine the dietary preferences 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 different categories of prey and how predatory the trout are The results have shown a similarity in the level of dietary regimes of the two populations outlined by a clear preference for larvae and nymph insects which are considered to be essential prey.