Formulation (%) and proximate composition (%) of the experiment diets.

1Defatted fish meal: 75.6% crude protein, 1.8% crude lipid; soybean meal: 51.7% crude protein, 2.0% crude lipid; of dry matter.
2Shanghai Zhixin chemical Co., Ltd., Shanghai, China.
3HUDONG article of everyday use Co., Ltd., Jiaxing, China.
4Blended oil of linseed oil and perilla oil (Linseed oil: Perilla oil  = 3:1).
5n-3 LC-PUFA enriched oil: DHA content, 37.1% of total fatty acid (TFA); EPA content, 20.8% of TFA; both in the form of triglyceride; HEBEI HAIYUAN Health biological Science and Technology Co., Ltd., Cangzhou, China.
6Mineral premix (mg or g/kg diet): MgSO4·7H2O, 1200 mg; CuSO4·5H2O, 10 mg; ZnSO4·H2O, 50 mg; FeSO4·H2O, 80 mg; MnSO4·H2O, 45 mg; CoCl2·6H2O (1%), 50 mg; NaSeSO3·5H2O (1%), 20 mg; Ca(IO3)2·6H2O (1%), 60 mg; CaH2PO4·H2O, 10 g; zoelite, 8.485 g.
7Vitamin premix (mg or g/kg diet): thiamin 25 mg; riboflavin, 45 mg; pyridoxine HCl, 20 mg; vitamin B12 (1%), 10 mg; vitamin K3, 10 mg; inositol, 800 mg; pantothenic acid, 60 mg; niacin, 200 mg; folic acid, 20 mg; biotin (2%), 60 mg; retinol acetate, 32 mg; cholecalciferol, 5 mg; alpha-tocopherol (50%), 240 mg; ascorbic acid, 2000 mg; choline chloride (50%), 4000 mg; wheat middling, 8.47 g.
8Mold inhibitor: contained 50% calcium propionic acid and 50% fumaric acid.
9Attractant: glycine and betaine.