This International Standard describes a method for the determination of the acute toxicity to one of three specified species of marine copepod (Copepoda, Crustacea) ofchemical substances which are soluble, or can be maintained as a stable suspension or dispersion, under the conditions of the test; industrial or sewage effluents, treated or untreated, after decantation, filtration or centrifugation if necessary; marine or estuarine waters. This title may contain less than 24 pages of technical content.