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Effects of intraspecific density on Neanthes arenaceodentata Moore were examined under laboratory conditions by rearing animals for 28 days, in the presence of sediment, at densities of 230, 575, 1150, and 1730 worms/m 2 . The lowest density examined in this study was similar to the mean reported field density for N. arenaceodentata. Food was allocated to each beaker on a per worm basis to...