Larval, dry weights (DW) were taken of 7-15 pooled larvae rinsed in distilled water and dried at 55°C for 24 h on pre-weighed aluminum squares. Rotifer dry weights and dry weights of copepods of the relevant size fractions were obtained from duplicate measurements of counted organisms retained on a pre-washed and weighed GF/C filter. The organisms were rinsed in distilled water and dried at 55°C for 24 h before being weighed.