A method for assessing chronic effects of toxic substances on the midge, Paratanytarsus parthenogeneticus-effects of copper.

A method was developed for the assessment of the chronic effects of copper on midge larva. Growth and reproduction of the midge was related to copper concentrations greater than 0.08mg/L; 50% reproductive impairment was apparent at a copper level of 0.37 mg/L. Growth and amount of food uptake by larvae were inversely related to copper concentration. Accumulation of copper in green algae was proportional to copper concentration in the water.