Micromolecular peptide fish meal and preparation method and application thereof

The invention discloses micromolecular peptide fish meal and a preparation method and application thereof. The preparation method of the micromolecular peptide fish meal comprises the following steps:washing fresh disused marine fish leftovers with clear water, removing scales and viscera, then conducting mincing to obtain surimi, adding water and complex enzyme for enzymolysis to obtain an enzymolysis solution, then filtering the enzymolysis solution to obtain a filtrate, and subjecting the filtrate to enzyme deactivation, sterilization and high-pressure spray drying so as to obtain the micromolecular peptide fish meal. The leftovers comprise processing by-products and low-value fishes and shrimps; the ratio of the mass of the surimi to the volume of the water is 1:(1-5); the complex enzyme comprises alkaline protease and neutral protease, and the addition of the complex enzyme is 0.1-3 percent by mass of the surimi; and the condition of the enzymolysis is as follows: pH value is 6-9, temperature is 45-60 DE