Fig. 1. Experimental design for testing the combined effects of fish density, feeding level (prey per fish) and prey density (prey per volume) on the survival, food intake, growth and food conversion in larvae of P. hypophthalmus. Identical symbols connected by plain lines highlight identical food densities (10–810 RFL L−1), obtained with different combinations of fish densities and feeding levels (i.e. N times the reference feeding level, RFL). An additional treatment (not shown on the figure) was also evaluated with fish raised at 10 fish L−1 offered 81 RFL