Distribution of Planktonic Larvae of the Japanese Surf Clam, Pseudocardium sachalinensis at Tomakomai, Hokkaido.

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The spatial distribution of planktonic larvae of the Japanese surf clam <I>Pseudocardium sachalinensis</I> at Tomakomai, Hokkaido, was studied in relation to the coastal water conditions. The umbo stage larvae, with 0.20-0.24-mm-long shells, were distributed mainly in the 5 m depth layer 400-1, 200 m off-shore. The full-grown stage larvae, with shells>0.24 mm long, were distributed patchily near the bottom 800-1, 600 m off-shore, and there were significant positive correlations between the larval density and water salinity or density. The relationship between the mean number of larvae and the coastal water conditions suggested that the major factor responsible for the appearance of the full-grown stage larvae was the existence of water with a salinity>33 or density>1025.5kg/m<SUP>3</SUP>.
日本水産増殖学会の論文