AU - Mahboobi Soofiani, Nasrollah AU - Shir-Mohammad, Fatemeh AU - Pour-Reza, Javad TI - Replacement of Fish Meal by Different Sources of Plant Protein in the Diet of Rainbow Trout ( Oncorhynchus mykiss) PT - JOURNAL ARTICLE TA - JCPP JN - JCPP VO - 2 VI - 1 IP - 1 4099 - http://jcpp.iut.ac.ir/article-1-269-en.html 4100 - http://jcpp.iut.ac.ir/article-1-269-en.pdf SO - JCPP 1 AB  - A 46-day feeding trial was conducted with rainbow trout (Oncorhynchus mykiss) to examine the effects of partial substitution of plant protein sources with fish meal in diets. Three different sources of plant protein including soybean, sunflower and cottonseed meals were substituted by fish meal at four levels of 10, 20, 30 and 40 percentages. Each diet was assigned to triplicate groups of fish in a completely randomized design as a 3×4 factorial arrangement, with a control diet. Seven hundred and eighty fish were used in this trial. Twenty fish were randomly assigned to each of 39 pens and were acclimated in these pens to the experimental conditions two weeks before treatments began. This substitution caused no significant differences in all the criteria measured with control diet. Fish fed diets of 30 and 40 percent soybean meal substitution showed greater weight gain and better growth performance, lower FCR and higher PER values in comparison with the fish receiving other diets, although the differences were not significant. Irrespective of substitution levels, comparison of fish fed by three different sources of plant protein in their diets showed that the fish fed diet containing sunflower meal had significantly (p CP - IRAN IN - LG - eng PB - JCPP PG - 103 PT - Research YR - 1998