Fig. 1. (A) Effects of various periods of ammonia exposure (30 mmol l^–1 NH₄Cl) on the concentrations of ammonia (A) and urea (B) in the blood plasma (open columns), liver (hatched columns) and muscle (filled columns) of Misgurnus anguillicaudatus. Values are means + S.E.M. (N=6). ^aSignificantly different from the 0 h/C condition, P<0.05; ^bsignificantly different from the 12 h/N condition, P<0.05; ^csignificantly different from the 24 h/N condition, P<0.05; ^dsignificantly different from the 48 h/N condition, P<0.05. N, 30 mmol l^–1 NH₄Cl; C, control.