نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه شیلات و منابع طبیعی، واحد بندرعباس، دانشگاه آزاد اسلامی، بندرعباس، ایران
2 گروه شیلات، دانشکده منابع طبیعی و محیط زیست، دانشگاه فردوسی مشهد، مشهد، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Fish powder is one of the most important ingredients in aquatic diets. A 63-day trial was conducted to examine the effect of different levels (10, 20, 30, 40, 50 and 100%) of fishmeal replacement for canola meal in the diet of pacu fish (Piaractus brachypomus, 45.12±1.36 g) on growth performance, survival rate, apparent digestibility coefficient of diets, activities of digestive and hepatic enzymes and hemato-immunological responses. The highest level of the final weight and specific growth rate and the lowest food conversion ratio were achieved in pacu fish fed with 40% canola meal. Significant decreasing trends were achieved in the serum levels of total cholesterol, triglyceride, and low-density lipoprotein of pacu fish fed with increasing the contents of canola meal (p < 0.05). Based on the growth indices, the maximum tolerable contents of dietary glucosinolate and phytate in the pacu fish were 4.90-5.22 µmol g-1 and 6.12-6.52 g kg-1, respectively. The activities of amylase, lipase, and trypsin in pacu fish increased according to enhance CM substitution levels (p < 0.05). According to the broken line technique, the highest specific growth rate (1.91% body weight day-1) was observed in pacu fish fed with 40.2% CM.
کلیدواژهها [English]