Abstract
Toxicity of commercial cypermethrin on the growth of three marine microalgal species, Skeletonema costatum (Bacillariophyceae), Scrippsiella trochoidea (Dinophyceae) and Chattonella marina (Raphidophyceae) was separately investigated by 96h and 24d growth tests. The growth was stimulated at low concentrations and inhibited under high concentrations; however, overcompensation was observed at the late period of exposure under high concentrations in 24d growth tests. The highest stimulation rates were obtained at concentration of 5μg/L. The 24h SC10 values were 0.91, 4.17 and 20.4μg/L for S. costatum, S. trochoidea and C. marina, respectively. The 96h IC50 values were 75.3, 227 and 114μg/L for the three species, respectively. Results suggest that cypermethrin level used for sea lice controlling exert a stimulative effect on phytoplankton growth, and might result in the succession of phytoplankton community structure due to different sensitivity of species.
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