Fig. 1. The amount of ammonia excreted (µmol N 3 h^-1 g^-1 wet mass fish) by unfed (control; white squares) and fed (grey squares) Periophthalmodon schlosseri at 3 h intervals during the 24 h period post-feeding. Values are means + S.E.M. (N=4). ^*Significantly different from the corresponding control value, P<0.05. ^aSignificantly different from 0-3 h, P<0.05; ^bsignificantly different from 3-6 h, P<0.05.