Additive for preventing rapeseed oil from inducing liver ultrastructure of juvenile pelteobagrus fulvidraco as well as preparation method and application of additive

The invention discloses an additive for preventing rapeseed oil from inducing liver ultrastructures of juvenile pelteobagrus fulvidraco as well as a preparation method and application of the additive, and belongs to the technical field of fish feed. Every 100 g of the additive comprises 20-40 g of fermented Chinese herbal medicine, 5-10 g of fucoxanthin, 0.02-0.08 g of manganese yeast and the balance of a carrier. The Chinese herbal medicines used for fermenting the Chinese herbal medicines comprise butterflybush flowers and fructus viticis in a mass ratio of 1: 1, and used zymophyte is pediococcus acidilactici with the preservation number of CGMCC: 1.2696. The additive can effectively improve liver ultrastructure change caused by replacement of fish oil with rapeseed oil, and ensures that growth and health of fish bodies are not affected by replacement of fish oil with rapeseed oil. The corresponding preparation method is simple and easy to operate. When the rapeseed oil is used in juvenile pelteobagrus fulv