Vertical distribution of Manila clam Ruditapes philippinarum larvae characterized through year-round observations in Tokyo Bay, Japan

The spatial density of the Manila clam Ruditapes philippinarum larvae was monitored during 2001 2003 at intervals of 2 4 weeks in Tokyo Bay. Clam larvae were sampled at 3 6 depth layers at four coastal sites (water depth 6 8 m) and four central sites (10 24 m) of the bay.In the coastal sites, small clam larvae (shell length ＜