Nature & Environment
Effects of pollutants on the aquatic environment
...adult fish when levels of calcium, sodium and chloride are low 4.0–4.4 Harmful to adult fish of many types that have not been progressively acclimated to low pH 3.5–3.9 Lethal to salmonids, although acclimated roach can survive for longer 3.0–3.4 Most fish are killed within hours at these levels (EPA, 2000) In addition, highly acidic waters can dissolve heavy...