Acute toxicity of ammonia to juvenile inanga (Galaxias maculatus)

The toxic concentration of unionised ammonia (NH 3 ) was assessed for juvenile Galaxias maculatus by running a 96 h LC50 test. The 96 h LC50 concentration at 15°C and pH ≥ 8 was 1.60 mg NH 3 1 −1 , with a 95% confidence limit of 1.47–1.73 mg NH 3 1 −1 . This is intermediate compared to toxic concentrations reported for other freshwater fish species.