稀有鮈鲫──一种新的鱼类毒性试验材料

A NEW TOXICITY TEST ORGANISM──Gobiocypris rarus

本文研究了稀有鲫（Ｇｏｂｉｏｃｙｐｒｉｓｒａｒｕｓ）作为毒性试验材料的可行性。采用换水式试验，在硬度为２００ｍｇ／Ｌ（以ＣａＣＯ３计）、ｐＨ７．８±０．２、温度２４－２５℃条件下研究了铬、铜、锌和五氯酚（ＰＣＰ）对稀有鲫的急性毒性。重铬酸钾对２日龄稀有鲫的２４ｈ和９６ｈ和ＬＣ５０控制范围分别２６３．６－３３４．７和１１５３－１７８．５ｍｇ／Ｌ（ｎ＝８）。铬、铜、锌和五氯酚对２日龄稀有鲫的急性毒性值（９６ｈＬＣ５０）范围，从铜的５２．２μｇ／Ｌ到铬的５２０００μｇ／Ｌ，毒性大小的顺序是铜＞五氯酚＞锌＞铬。研究结果表明，稀有鲫有可能发展成为一种较为理想的毒性试验材料。

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 24h and 96h 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(96h 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.