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Fig. 1. (A) Body mass of individually marked fish over 70 days in the three experimental treatments of Series 1: nominal, [T_Amm]=0 µmol l^–1 (control, N=13), [T_Amm]=70 µmol l^–1 (low ammonia, N=7) and [T_Amm]=225 µmol l^–1 (high ammonia, N=16). Values are means ±1 S.E.M. There were no significant differences at any time, but ANCOVA indicated higher overall growth (P<0.055, two-tail; P<0.028, one-tail) in the low ammonia treatment relative to the control. (B) Cumulative food consumption per fish, measured on a tank basis (N=4 for control and high ammonia, N=2 for low ammonia) in this same series. By Day 70, cumulative food consumption in the high ammonia treatment group was significantly greater (asterisk) than in the other two treatment groups.

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