A series of 14 day experiments was conducted on five common New Zealand fish species (redfin bully Gobiomorphus huttoni , inanga Galaxias maculatus , brown trout Salmo trutta , longfin eel Anguilla dieffenbachii and koaro Galaxias brevipinnis ) to assess the effect of pH on survival and changes in body mass. No species survived in water of pH pH 4·5, G. maculatus larvae were also tested and had high mortality at this pH . Resu...