Abstract:Studies on the toxic effects of suspended substances (SS) on the embryos and newly hatched larvae of Cynoglossus semilaevis Günther were conducted in laboratory in October 2007. The results showed that the effect of SS on hatching time was not evident. When the SS concentration was less than 200 mg/L, there was no significantly difference in hatching rate (P＞0.05)between the treatment and control.When the SS concentration was more than 200 mg/L, there were significant difference between the treatment and control in embryos hatching rate and deformity rate of newly hatched larvae (P＜0.01). The Incipient LC50（95% confidence limits）of SS to embryo was 1 974.8 mg/L (1 375.4-2 835.5 mg/L), and the safety concentration(SC) was 197.5 mg/L.The 48 h LC50 and 96 h LC50（95% confidence limits）of SS to newly hatched larvae were 226.9 mg/L (204.6-251.7 mg/L) and 202.9 mg/L (182.3-225.9 mg/L), respectively,and the SC was 20.29 mg/L.
