The toxic effects of technical grade (95 %) malathion and commercial (25 %) malathion were investigated on young (£ 24 h old) Daphnia magna in static acute toxicity tests (24 and 48 h). The culture of D. magna and toxicity tests were performed at 24 ± 1 ºC with a photoperiod of 16 h light and 8 h dark. To obtain a healthy population, the fecundity of each female in their life cycle was also investigated. The immobilization of daphnids was considered for determination of the 24 h / 48 h effective concentration (50 %). The EC50 values were found by the probit method 24 h /48 h for technical malathion as 0.8 and 0.028 ppm., and for commercial malathion as 0.11 and 0.003 ppm respectively.
RASSOULZADEGAN, MARYAM and AKYURTLAKLI, NUSRET (2002) "The Toxic Effects of Malathion (Organophosphate Insecticide) on the Daphnia magna Straus, 1820 (Crustacea, Cladocera)," Turkish Journal of Zoology: Vol. 26: No. 4, Article 3. Available at: https://journals.tubitak.gov.tr/zoology/vol26/iss4/3