Fig. 5. Contents (µmol g^-1) of ammonia (open), glutamine (filled) and glutamate (hatched) in the brains of Periophthalmodon schlosseri or Boleophthalmus boddaerti killed 15 min after the injection with saline (0.9% NaCl; control), succumbed within 15-50 min to an intraperitoneal injection with a sublethal dose (15 and 12 µmol g^-1 fish, respectively) of CH₃COONH₃ (dead), or survived a sublethal dose of CH₃COONH₃ (15 and 12 µmol g^-1 fish, respectively) and killed at hour 24. ^*Significantly different from values of the saline-injected control and fish survived for 24 h.