عنوان مقاله [English]
Rainbow trout is the most importantspecies ofcold water fishes in Iran and the feeding diets which improve the quality and growth of this fish are of great importance. In this study, 360 youth of rainbow trout fingerlings with approximate weight of 100±0.04g were fed with different concentrations of sesame seed (%) in their diets instead of fish meal for 120 days. Feeding diets were prepared in 4 concentration levels (15, 20 and 25 percent of mealed sesame seed instead of fish meal, and same diet without sesame seed meal for the witness group) in triplicates as a completely random design experiment. The highest rate of weight gain (281.5±0.08g), length gain (27.5±0.01 cm), specific growth rate (1.45±0.01), protein efficiency rate (2.09±0.01) and food conversion ratio (1.4±0.01) were obtained in treatment 3. The lowest rate of weight gain (245±0.04g), length gain (26.5±0.01 cm), specific growth rate (1.2±0.04), protein efficiency (1.45±0.04) and food conversion ratio (1.9±0.04) was obtained in the witness treatment. The obtained results indicated a significant difference among the witness and treatments (P<0.001). Alternation of sesame seed improved the growth and health of rainbow trout fingerlings. These results demonstrated that sesame seed meal can be used as an alternative ingredient in its feeding diet, instead of fish meal.
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