Exposure of silver carp (Hypophthalmichthys molitrix) to environmentally relevant levels of cadmium:hematology,muscle physiology,and implications for stock enhancement in the Xiangjiang River (Hunan,China)  

作　　者：ZHANG Ting ZHANG Yu LI DeLiang XIAO TiaoYi LI Jie 

机构地区：[1]College of Animal Science and Technology,Hunan Agricultural University [2]School of Biological Science and Technology,Central South University

出　　处：《Science China(Life Sciences)》2013年第1期66-72,共7页中国科学（生命科学英文版）

基　　金：supported by the National Natural Science Foundation of China (31100282,31000183,31000179)

摘　　要：Cadmium is a non-essential metal with a wide distribution that has severe toxic effects on aquatic animals. Changes in hematology and muscle physiology were examined in silver carp (Hypophthalmichthys molitrix) exposed to environmentally relevant levels of cadmium (0.01 mg L-1 ) for 96 h. Cadmium exposure induced significant increases in the red blood cell count, and in the plasma concentrations of cortisol, glucose, and lactate. This suggests that the dose of cadmium was sufficient to cause stress, possibly associated with impaired gas exchange at the gills. There were no changes in hemoglobin concentration or plasma protein concentration. Significant decreases in muscle energy fuels (ATP and glycogen), and increases in muscle lactate persisted until the end of the exposure period, respectively. The changes in muscle lactate and protein in silver carp differed from those observed in response to exposure of fish to cadmium and heavy metals in other studies. The study highlights the importance of selecting unpolluted release sites with suitable water conditions for the survival of newly released individuals for stock enhancement of the Xiangjiang River.Cadmium is a non-essential metal with a wide distribution that has severe toxic effects on aquatic animals. Changes in hema- tology and muscle physiology were examined in silver carp （Hypophthalmichthys molitrix） exposed to environmentally rele- vant levels of cadmium （0.01 mg L^-1） for 96 h. Cadmium exposure induced significant increases in the red blood cell count, and in the plasma concentrations of cortisol, glucose, and lactate. This suggests that the dose of cadmium was sufficient to cause stress, possibly associated with impaired gas exchange at the gills. There were no changes in hemoglobin concentration or plasma protein concentration. Significant decreases in muscle energy fuels （ATP and glycogen）, and increases in muscle lactate persisted until the end of the exposure period, respectively. The changes in muscle lactate and protein in silver carp dif- fered from those observed in response to exposure of fish to cadmium and heavy metals in other studies. The study highlights the importance of selecting unpolluted release sites with suitable water conditions for the survival of newly released individu- als for stock enhancement of the Xiangjiang River.

关 键 词：silver carp HEMATOLOGY muscle physiology cadmium exposure stock enhancement 

分 类 号：X835[环境科学与工程—环境工程]