Proximal and sensory analysis of red tilapia (Oreochromis sp.) fed with fish tanks sediments from a Biofloc culture

Abstract Feeding accounts for 50%-60% of production costs in fish farming, and alternative raw materials are used to lower production costs. These raw materials can alter nutritional values and sensory aspects of the final product. The present study describes the results for the proximal composition, sensory, and microbiological analyses of red tilapia (Oreochromis sp.) fed with a biofloc meal (fish sediment residue). The results showed that the red tilapia biofloc meal contained protein levels over 30%, with 3% nitrogen and 6% calcium. Fish fed biofloc meal showed productive performances within the ranges established for the species. Sensory analysis revealed that the cooked product’s appearance was very characteristic, presenting a slight metallic flavor and moderate juiciness. The bromatological composition analysis indicated that each 100g of tilapia contained 16 g of protein. Finally, the microbiological study guarantees compliance with the local tandards and confirms that the product does not contain significant levels of microorganisms that could cause foodborne diseases when consumed by humans. In conclusion, the use of biofloc meal at a small red tilapia farm proved to be a sustainable alternative for feeding Oreochromis sp.摘要：饲料成本占水产养殖生产成本的50%~60%，为降低养殖成本，业界常采用替代原料配制饲料，但此类原料会改变成品的营养价值与感官品质。本研究针对以生物絮团饲料（biofloc meal，鱼沉积物残渣）为日粮的红罗非鱼（Oreochromis sp.），开展了常规营养组成、感官及微生物学分析，现将结果报道如下。结果表明，该生物絮团饲料的粗蛋白含量超过30%，含氮量3%、钙含量6%。投喂该饲料的红罗非鱼，其生产性能处于该物种的既定标准范围内。感官分析显示，烹饪后的红罗非鱼外观特征鲜明，带有轻微金属味，多汁性适中。食品营养组成分析显示，每100g罗非鱼中含有16g蛋白质。最后，微生物学检测结果证实该产品符合当地标准，且未检出可引发食源性疾病的高水平微生物。综上，在小型红罗非鱼养殖场中使用生物絮团饲料，可为Oreochromis sp.的养殖提供一种可持续的饲料替代方案。