Effect of replacing dietary fish meal with black soldier fly larvae meal on growth and fatty acid composition of Jian carp (Cyprinus carpio var. Jian)

To explore the effect of replacing dietary fish meal (FM) with black soldier fly (Hermetia illucens) larvae meal (BSFLM) on growth and body composition of Jian carp (Cyprinus carpio var. Jian), the FM in basal diet of Jian carp was replaced by 0, 35, 70, 105 and 140 g/kg BSFLM respectively to form five isonitrogenous and isolipidic diets. A total of 300 Jian carp (10.1 +/- 1.6g) were randomly divided into five groups (triplicate per group) and fed five diets, respectively. After 56days of feeding, growth and body composition of fish were determined. Results showed that serum maleic dialdehyde, total antioxidant capacity, 18:1n-9, 18:2n-6, 20:5n-3 and 22:6n-3 in fish significantly decreased and 12:0, 14:0 and 16:0 significantly increased with increasing replacement of BSFLM. The growth, biological parameters, proximate composition, amino acid composition and serum biochemical parameters of Jian carp were not affected by the replacement of BSFLM. In conclusion, up to 140g/kg BSFLM (100% replacement of FM) can be included in diets of Jian carp without unfavourable effects on growth while decreasing n-3 highly unsaturated fatty acid (HUFA) composition in body of fish, suggesting that BSFLM could be used after nutrient enrichment with n-3 HUFA to bring active effects on fish quality.