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以南方鲇Silurus meridionalis Chen初孵仔鱼、10日龄仔鱼为对象,采用水体染毒法进行急性镉暴露实验,研究了南方鲇仔鱼对镉暴露的耐受程度.初孵仔鱼实验设置一个对照组和5个镉处理组(0.04 mg/L,0.08 mg/L,0.16mg/L,0.32mg/L,0.64mg/L);10日龄仔鱼实验设置一个对照组和5个镉处理组(0.075mg/L,0.15mg/L,0.3mg/L,0.6mg/L,1.2mg/L).结果表明:随镉暴露质量浓度升高,初孵仔鱼存活率在暴露24h各组间差异不具有统计学意义(p>0.05);暴露48h存活率仅在0.64mg/L组显著低于其余各组(p<0.05);暴露72h,96h存活率在0.16mg/L,0.32mg/L和0.64mg/L组显著低于其余各组(p<0.05).初孵仔鱼96hLC50为0.104mg/L,10日龄仔鱼96hLC50为0.039mg/L.镉暴露对10日龄仔鱼存活率的影响呈剂量依赖效应和时间依赖效应.与文献报道的多数鱼类相比,南方鲇仔鱼对镉暴露相对较敏感;而10日龄仔鱼对镉暴露的敏感程度高于初孵仔鱼.10日龄可能是南方鲇仔鱼发育受水体镉污染影响的瓶颈期,因此南方鲇生境水质保护工作应重点考虑到10日龄仔鱼的发育.
In order to study the acute exposure to cadmium in the larvae of Silurus meridionalis Chen and the 10-day-old larvae of southern catfish, Five cadmium treatment groups (0.04 mg / L, 0.08 mg / L, 0.16 mg / L, 0.32 mg / L, 0.64 mg / L) and one control group and five cadmium treatment groups /L0.15mg/L,0.3mg/L,0.6mg/L, 1.2mg/L) .The results showed that: With the cadmium exposure mass concentration increased, the survival rate of newly hatched larvae after exposure 24h difference between the groups did not have statistics (P> 0.05). The survival rate at 48h after exposure was significantly lower than that of the other groups only at 0.64mg / L (p <0.05). The survival rates at 96h exposure were 0.16mg / L, 0.32mg / L and 0.64mg / L group was significantly lower than the other groups (p <0.05) 96hLC50 0.104mg / L, 10-day-old larva 96hLC50 0.039mg / L. Cd exposure on 10-day survival rate of larvae in a dose-dependent manner Effect and time-dependent effect.Compared with most fish species reported in the literature, Southern larvae were more sensitive to cadmium exposure, while 10-day-old larvae were more susceptible to cadmium exposure than fresh-born larvae Luna Bringing bottleneck affected by cadmium pollution of water bodies, so southern catfish habitat water quality protection work should focus on the 10-day-old larvae development.