<;P>;PROBLEM TO BE SOLVED: To provide a novel composition which efficiently accelerates maturation and/or spawning of crustacea. <;P>;SOLUTION: The composition for accelerating maturation and/or spawning of crustacea contains neutral lipid fractions and/or free amino acid/peptide fractions isolated from lugworm extract, wherein the content of the neutral lipid derived from lugworm is &ge;0.5 wt.% in terms of dry weight and the content of the free amino acid/peptide derived from lugworm is &ge;0.1 wt.% in terms of dry weight. <;P>;COPYRIGHT: (C)2011,JPO&INPIT