Effects of bio-fermented feed on growth, digestion, immunity, antioxidant capacity, and intestinal structure of juvenile yellow catfish (Pelteobagrus fulvidraco)

Abstract

Abstract To investigate the feeding effect of fermented feed, juvenile yellow catfish (1.23±0.54) g were fed with hard pellet feed and biological fermented feed in an indoor recirculating water system for 8 weeks. The study analyzed the effects of fermented diets on the growth performance, digestion, immunity, antioxidant capacity, and intestinal structure of yellow catfish. The results showed that: the fermented diet significantly increasedthe WGR, SGR, and VSI, but had no significant effect on the HSI. The fermented diet significantly increased the activities of Try, Lip, and AMS in the intestinal tract of yellow catfish. The fermented diet significantly increased the activities of ACP, AKP, CAT, and SOD in the serum of yellow catfish and significantly decreased the content of MDA in the serum. The fermented diet significantly increased the width and height of the intestinal villus and the thickness of the intestinal wall in the midgut of yellow catfish.The results indicate that fermented feed could effectively improve the growth performance, digestive enzyme activity, and immune and antioxidant capacity, and improve the intestinal tissue structure of yellow catfish. This provides a theoretical basis for the production of microbial fermented feed.