April, 1996 to March, 1997 studies on the abundance and secondary production of Limnodrilus hoffmeisteri in an algae-dominated lake showed that the worm density and biomass peaked in December at 152 ind/m2 and 0.087 g/m2, respectively. The secondary production of the animal was 0.294 g/m2 fresh wt/a. The turnover rate (P/B ratio) was 11.4.