Results
3.1. Diets
The proximate composition of the experimental diets is shown in Table 1. The plant-protein based diets were almost iso-nitrogenous and iso-energetic (383–395 g/kg crude protein; 22.5–22.6 MJ/kg). The fish meal control diet had a protein:lipid content of 386:282 g/kg. Enzyme activities of the experimental diets were very similar independently of whether the enzymes were supplemented individually to the diets or in combination.