A New Toxicity Test Organism--Gobiocypris rarus

This study deals with the evaluation of Gobiocypris rarus as a toxicity test material.The acute toxicity of chromium,copper,zinc and pentachlorophenol (PCP) to Gobiocypris rarus were determined under renewal condition with a hardness of 200 mg/L (as CaCO3) at Ph7.8±0.2 in water held at 24-25℃.The control limits of 24 h and 96 h LC50 of potassium dichromate to 2 d old Gobiocypris rarus were 263.6-334.7 and 115.3-178.5 mg K2Cr2O7/L (n=8).The values of the acute toxicity (96 h LC50) to 2 d old Gobiocypris rarus ranged from 52.2 μg/L for copper to 52000 μg/L for chromium,and were ranked in order of toxicity:Cu>PCP>Zn>Cr.The results of this study indicated that Gobiocypris rarus may be a proper animal for toxicity test.