Abstract
As part of a programme of acquiring data for preparing standards to safeguard European, nonsalmonid, freshwater fish from pollution, toxicity tests were carried out in hard, well‐aerated water. Asymptotic median lethal concentrations (LC50s) of undissociated ammonia, cyanide, nitrite and phenol to one or more of three species were determined. The LC50s were as follows: to common carp 16mg1‐1 as NO2–N; to perch 0.1 mg1‐1 as HCN; to roach 0.35 mg1‐1 as NH3‐N, 0‐11mg1‐1 as HCN, 10.1 mg1‐1 asNO2‐Nand 10mg‐1 as phenol. In order to define these LC50s, exposure periods within the range 0.3 days (phenol) to 14 days (nitrite) were required. Comparisons are made with other data and the tentative water quality ‘criteria’ proposed by the European Inland Fisheries Advisory Commission.
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