Fish meal is the most important rotein source that is used in rainbow trout diets, but however that is an expensive and limited food ingredient resource. It is serious concern on the long-term availability of this feedstuff for use in rainbow trout diets . Sargent , J.R. and Tacon, A.G., 1999. Development of farmed fish: a nutritionally necessary alternative to meat. Proc. Nutr. Soc. 58 , pp. 377–383. View Record in Scopus | Cited By in Scopus (102) Thus, replacement of fishmeal by plant protein sources For reduce roduction costs is needed.