Fig. 1

Body weight and growth of fish during an 8-week feeding trial. Different colours indicate significant differences in growth rate of fish between diets (P-value < 0.05, see Table 1 for details). Dietary manipulations were performed on four replicate tanks for each experimental diet (S₄₅, S₃₄B₁₁, S₂₂B₂₂, S₁₁B₃₄ and B₄₅) and three replicate tanks for reference FM and SBM diets. Body weight data for each tank were generated by recording the biomass of all (~150) fish in the tank, divided by the number of fish. Growth rate of fish for each tank was calculated as the initial body weight (day 0) subtracted from the final body weight (day 56). a Body weight of fish calculated for each diet as the mean across replicate tanks (error bars are omitted for simplicity). b Growth rate of fish for each replicate tank plotted against the fish meal content of the diet