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Dry hydrolysate was prepared from protein-containing waste of Icelandic scallop processing by means of a proteinase complex from king crab hepatopancreas. The resulting product contains no less than 80% free amino acids and oligopeptides. Predominant are aspartic acid, leucine, isoleucine, arginine, and lysine, which account for more than 50% of the free amino acids. The potential of using the protein hydrolysate as a nutrient for microorganism cultivation is estimated. It is demonstrated that the hydrolysate can be used for growing test cultures.