Investigation of some chemical and microbial properties of biosilage produced from rainbow trout (Oncorhynchus mykiss) wastes

With the increase in production, consumption and processing centers of rainbow trout, the optimal use of the generated waste is very important. One of the ways to convert these wastes into high value-added products is to produce biosilage. The aim of this study was to investigate some of the chemical and microbial properties of biosilage produced from rainbow trout wastes as a suitable product for use in the livestock, poultry and fish feed industry. The results showed that the product has 52.27% protein and 8.3% fat. PV and TVB-N for biosilage were measured to be 2.61 meq/kg and 44.0 mg/100g, respectively. Logarithm total viable bacteria, coliforms, Fecal coliforms, Escherichia coli and mold and yeast count in the product were reported 8.78, 3.72, 1.18, zero and 3.23 per gram, respectively. The concentrations of manganese, copper, iron and zinc were 10.6, 13.7, 251.3 and 118.7 mg/kg, respectively in the produced silage. According to the results of the present study and comparison of these findings with other studies, it can be claimed that the biosilage produced in the present study is almost equivalent to other consumables for feeding livestock, poultry and fish in terms of indicators and characteristics and this product can be used as a suitable alternative to other common products used in the food industry.