عنوان مقاله [English]
An experiment was conducted to evaluate the effect of feeding frequencies and stocking size on growth and food conversion ratio (FCR) of rainbow trout (Oncorhynchus mykiss) in brackish water for 102 days. Three stocking sizes (10, 25 and 40g/fish) of rainbow trout and three fish feeding frequencies (twice, three and four times per day) were examined at the same time. The results showed that in the group with 10g initial weight increasing the feeding frequency, some growth factors like final weight, daily growth, and weight gain increased and the food conversion ratio (FCR) decreased. It means in this group (10g) two times feeding per day is not enough for an acceptable growth rate. In the two other groups (with initial weight 25 and 40g) although by increasing the feeding frequency, some growth factors had a little increase but these differences are not significant. Therefore, in rainbow trout culture with initial weight of at least 25g, two times feeding per day were enough. With connivance of feeding frequencies, the lowest FCR was in the group with 10g initial body weight and there was not any significant difference in SGR. So, according to the results, the suggestion is the fish should be stocked with 10g initial body weight.
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