Abstract
The growth rate of fish is an important parameter in fish farms that influenced by environmental factors, including the amount and frequency of feeding is feeding. It is stated that the growth rate of fish is considerably dependent on the weight and age of the fish. In this study the possible effects of the amount and frequency of feeding on weight changes and growth rate of rainbow trout was examined. For this project, six pools with a capacity of 6,200 rainbow trout of 10 g was transferred, that 3 pools were fed with 2% of body weight (treatment 1) and 3 pools were fed with 4% of body weight (treatment 2) and biometry were done in a monthly basis until reaching to weight. Data obtained were analyzed using a statistical method of Paired t-test and SPSS considering P <% 5 for levels of significance. Results obtained indicated that the treatment 2 pools in the weight range 10-25 g and water temperature 14-16 ° C show more weight lower feed conversion coefficient compared to treatment 1 pools. The results indicate that the use of treatment 2 resulted in better growth of fish, therefore this diet is recommended.
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