Abstract
Two parts of the population of Japanese scallop Mizuhopecten yessoensis inhabiting sites with different bottom sediments in an open part of Peter the Great Bay of the Sea of Japan were compared. The scallops grew slower on muddy site compared to sandy site despite better food availability at muddy site. The food sources were determined using fatty acids as biomarkers. Analysis of the fatty acid composition of the scallops has identified diatom plankton, flagellates, and invertebrate larvae as the main scallop food sources. Benthic bacteria insignificantly contributed to the scallop diet. The food composition slightly varied in scallops on different sediment types. Most likely, low oxygen content in water, high resuspension of fine sediment particles rich in dead organic matter, and high content of contaminants accumulated in muddy sediments are the main factors of decelerated growth of scallops on muddy sites.
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