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The aim of the present study was to determine and compare acute toxicity of terbutryn in Danio rerio and Poecilia reticulata, and in two different developmental stages of D. rerio - embryonic and juvenile. Acute toxicity tests were performed according to OECD methodology. The LC50 values were assessed by probit analysis using EKO-TOX 5.2 programme. The 96hLC50 terbutryn mean value of 5 tests was 2.85 +/- 0.75 mg.l(-1) for the juvenile stage of P. reticulata and 5.71 +/- 0.46 mg.l(-1) for the juvenile stage of D. rerio. For the embryonic stage of D. rerio the 144hLC50 terbutryn mean value of 6 tests was estimated as 8.04 +/- 1.05 mg.l(-1). The study proved significantly higher (p < 0.01) sensitivity of the juvenile stage of D. rerio to terbutryn compared to the embryonic stage of D. rerio and significantly higher (p < 0.01) sensitivity of the juvenile stage of P. reticulata to terbutryn compared to the juvenile stage of D. rerio. herbicides. This study documented differences in sensitivity of several fish species and different developmental stages of fish to one of triazine.

Comparison of Terbutryn Acute Toxicity to Danio rerio and Poecilia reticulata