Impact of Autolysed Brewer's Yeast and Soluble Dried Yeast Extract on Growth Performance and Mucosal Health of Atlantic Salmon () Parr.

Yeast-based feed additives have emerged as promising functional feed additives (FFAs) to promote sustainable aquaculture development through enhanced gut health and immune modulation in fish. The present study evaluated the impact of autolysed brewer's yeast (ABY) and soluble dried yeast extract (SDYE) in improving the intestinal and skin histology, immune response, and intestinal microbiome of Atlantic salmon parr () over a 9-week feeding trial. Three experimental diets were produced: a control diet, a diet supplemented with ABY at 2.