Fig. 4. Ammonia content (µmol g^-1 wet mass tissue or µmol ml^-1 plasma) in muscle (white bars), liver (grey bars), gut (black bars), brain (hatched bars) and plasma (cross-hatched bars) of Periophthalmodon schlosseri during the 24 h period post-feeding. Values are means + S.E.M. (N=4), except for brain and plasma (N=3). ^aSignificantly different from 0 h control, P<0.05; ^bsignificantly different from 3 h value, P<0.05; ^csignificantly different from 6 h value, P<0.05.