The acute toxicity of 78 chemicals and pesticide formulations against two brackish water organisms, the bleak ( ) and the harpacticoid

The toxicity of 78 chemicals and pesticide formulations against the bleak, Alburnus alburnus (Pisces) and the harpacticoid Nitocra spinipes has been tested. The results are expressed as the 96 hr LC(I) 50 i.e. the initial concentration of a substance killing 50 per cent of the test organisms during 96 hours. Among the compounds tested are inorganic and organic compounds (metal salts, solvents and a few more complex compounds such as organotin compounds), pesticide formulations and other industrial chemicals (PCB-substitutes, phthalic acid esters and polychlorinated paraffins).