Effect of terbutryn at environmental concentrations on early life stages of common carp ( Cyprinus carpio L.)

Abstract

The aim of this study was to assess the toxicity of terbutryn to early developmental stages of common carp ( Cyprinus carpio). Based on accumulated mortality in the experimental groups, lethal concentrations of terbutryn were estimated at 36 day LC50 = 3.06 mg l −1 terbutryn. Based on inhibition of growth in the experimental groups, lowest observed-effect concentration (LOEC) = 0.005 mg l −1 terbutryn; and no observed-effect concentration (NOEC) = 0.0007 mg l −1 terbutryn. Fulton’s condition factors were significantly lower in fish exposed to 2 mg l −1 compared with controls. By day 30, fish exposed to 0.00002 mg l −1 – real environmental concentration in Czech rivers – 0.02, 0.2, and 2 mg l −1 terbutryn showed significantly lower mass and total length compared with controls. No significant negative effects on hatching or embryo viability were demonstrated at the concentrations tested, but significant differences in early ontogeny among groups were noted. Fish from the two highest tested concentrations (0.2 and 2 mg l −1) showed a dose-related delay in development compared with the controls. At concentrations of 0.02, 0.2, and 2 mg l −1 damage to caudal kidney tubules when compared to control fish was found.