Experiment 2 (E2)
Quality of the pond water was high throughout the experiment: Secchi clarity was 40 cm; pH and dis- solved oxygen at 1445 hours ranged from 5.8 to
7.3 and from 7.4 to 10.6 mg/L respectively. Max- imum and minimum water temperatures fell stead- ily during the experiment from 30 oC to 26 oC and from 27 oC to 24 oC respectively (Fig. 3).
Net damage to two cages resulted in the escape of a large number of the fish, necessitating production data from these cages being excluded from the an- alysis. Fish loss from the cages was otherwise low, with 98.2% of those initially stocked being present at the end of the experiment.
Fish fed the M4 diet performed the best overall, growing faster (P < 0.05) than those fed either Ctl or P2 diets (Table 4). Fish fed the Ctl diet had the lowest food issued (P < 0.05) and the best feed conversion, which was better (P < 0.05) than either M3 or P2 diets. Dressing-out percentage was un- affected (P > 0.05) by diet and averaged 89.2 ±
0.54%.