Production of biological silage from wastes of rainbow trout (Oncorhynchus mykiss) using autogenous bacteria and quantitative and qualitative measurement of amino acid and fatty acid profiles of the product

With the increasing of rainbow trout processing centers in the country, the optimal use of the wastes produced is necessary. One of the efficient use of waste products is convert them into products with value added products such as biosilage. This product, if it has the desirable characteristics, can be used in the fish, livestock and poultry feed industry. The aim of the present study was to produce biosilage from rainbow trout wastes using autogenous bacteria and to investigate the amino acid and fatty acid profiles of the product. The results showed that the total of essential, non-essential and total amino acids in the produced product are 32.12, 27.06 and 59.18 g/100g, respectively. It was further found that among the essential and non-essential amino acids, arginine and glutamic acid have the highest amounts (5.82 and 9.02g per 100g of substrate, respectively) and the product produced does not contain the amino acid tryptophan. In the product, the chemical index was calculated based on the reference proteins for the amino acids histidine, arginine, valine and leucine more than one. Examination of biosilage fatty acids showed that the total of saturated fatty acids (SFA), monounsaturated fatty acids (MUFA) and polyunsaturated fatty acids (PUFA) in this product are 33.39, 31.32 and 35.27%, respectively. In the following, ratio of omega 6 to omega 3 in biological silage was reported to be 9.73. According to the findings, biosilage produced from rainbow trout wastes is rich in term of amino acids and fatty acids and can be added to diet formulation in fish, livestock and poultry feed.