نوع مقاله : مقاله کامل علمی - پژوهشی
نویسندگان
گروه شیلات، دانشکده کشاورزی و منابع طبیعی، دانشگاه گنبدکاووس، گنبدکاووس، ایران.
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Recycling fishery wastes through a fermentation process generates added value by converting these discarded resources into a valuable protein source. To enhance the value of rainbow trout (Oncorhynchus mykiss) waste, the materials were fermented using two bacterial strains, Bacillus subtilis and Lactobacillus plantarum, and subsequently utilized as a protein source to replace fish meal at inclusion levels of 30%, 40%, and 50% in the diet of Nile tilapia (Oreochromis niloticus). Protein quality and chemical composition of the fermented silage and formulated diets were analyzed in the first phase of this study, while growth performance indices and digestive enzyme activities of Nile tilapia fed these diets for 56 days were evaluated in the second phase. Results showed that the fermented silage contained crude protein and lipid levels of 34.83% and 25.77%, respectively, with a total energy content of 1839 kJ per 100 g. The contents of all essential amino acids in the fermented silage were significantly lower than those in fish meal (p ≤ 0.05). The best growth performance, including final body weight (59.29 g), specific growth rate (1.90%), and optimal feed conversion ratio (3.08), was obtained from diets containing 30% fermented silage. Diets with 40% fermented silage exhibited the highest protease activity. In conclusion, the fermented silage produced from rainbow trout waste can replace up to 30% of fish meal in Nile tilapia diets without adverse effects on growth performance or digestive physiology.
کلیدواژهها [English]
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