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The LC50‐values of As3+‐compounds for Channa punctatus are determined for a 48‐h exposure to 19.4 (18.02… 21.3) mg/1 and for a 96‐h exposure to 14.3 (13.06… 16.80) mg/1. At a long‐time exposure to 7.0 mg/1 As3+, during the first seven days there does not occur any change of growth, then the...
The biology and purity of the water in three profiles of the Oder River in its upper stream on the Czechoslovak territory were investigated in the course of 1979… 1980. Zoobenthos, physical and chemical parametres, and microbiological germs were analysed. The bioseston was considered only...
The acute toxicity of nickel sulphate to Colisa fasciatus has been evaluated by static bioassay experiments. The LC 50 values of nickel for 24, 48, 72 and 96 h were computed to be 96.12, 60.18, 24.45 and 16.72 mg/1, respectively. Their 95 % confidence limits have also been investigated.
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