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Test organisms of three trophic levels (Daphnia, alga, fish) were exposed to the test substance decamethylenediamine at concentrations ranging from 0.7 to 80 mg/L. The green alga Desmodesmus subspicatus was observed to be most susceptible to the test substance. The ErC50 was 12.68 mg/L and the NOEC (growth rate) was 1.5 mg/L.