Aquaculture feeds include a combination of proteinaceous vegetable material and proteinaceous fish material. The vegetable and fish materials are combined with additives such as alcohol and reducing agents and heated at elevated temperatures to release oil and nutrients from the fish material. At least a portion of the oil is absorbed into the proteinaceous vegetable material to form a proteinaceous product from the mixture. Alcohol is removed from the mixture to form the aquaculture feed with enhanced protein digestibility and solubility. The aquaculture feed may include up to about 50 percent proteinaceous vegetable material and up to about 50 percent proteinaceous fish material. Aquaculture species ingesting diets of the aquaculture feed experience improvements in weight gain, protein conversion efficiency, and feed efficiency compared to aquaculture species ingesting diets of fishmeal alone or soy flake produced according to traditional methods.
