Preliminary Investigation And Analysis Of Fish Resources In Jingwei Lake National Wetland Park

This paper is on the status of fish resources in the Shanxi Zhangzi Jingwei Lake National Wetland Park,the contents of the heavy metals and the degree of pollution of heavy metals in fish via the study of the natural environment of the Jingwei Lake National Wetland Park and the heavy metal pollution in the fish body.The results are as follows:(1)In this study,736 fishes including 8 species which belonged to 2orders and 5 families were caught and used.Cypriniformes accounted for the most,accounting for 62.5% of the total species,being the largest numbers of the total fish species.And Perciformes accounted for 37.5%.Cyprinidae is the main species of the Cypriniformes,and 4 species accounted for 50% of the total species.And Cobitidae accounted for only12.5%.In addition,each of Eleotridae,Channidae and Gobiidae in the family of Perciformes accounted for 12.5% of the total fish species.(2)In the study,the cages were used for catching fishes.Therefore most of the fishes are small and young.According to the standard length-weight relationship,Hemiculter leucisculus showed allometric growth.Ctenogobius giurinus,Pseudoperilampus lighti,and Abbottina rivularis were generally isometric growth.Misgurnus anguillicaudatus,Erythroculter ilishaeformis,Channa argus,Hypseleotris swinhonis,and Ctenogobius giurinus are only one year old.Hemiculter leucisculus and Abbottina rivularis were one or two years old and mainly the former.The Pseudoperilampus lighti include the mixed groups of one year old,and two or three-years old.(3)The ratio of male to female of Hemiculter leucisculus is 1:1.128;1:1.632 for Ctenogobius giurinus;1:0.961 for Abbottina rivularis;and1:2.125 for Pseudoperilampus lighti.(4)In Jingwei Lake National Wetland Park,the contents of heavy metals in five kinds of fish were as follows: Cu:0.34-1.76 mg/kg,Zn:5.24-23.8mg/kg,As:0.041-0.293mg/kg,Cd:nd-0.178 mg/kg,Hg:0.025-0.1 mg/kg,andPb:nd-1.37 mg/kg.The contents of Cu and Zn in the Ctenogobius giurinus were significantly higher than those in other fish species.The content of As was significantly higher in the Abbottina rivularis than in the Hemiculter leucisculus,and the contents of As in other fish species were not significantly different.The content of Hg was significantly higher in the Ctenogobius giurinus and Abbottina rivularis than in Pseudoperilampus lighti,and the level of Hg was not significantly different among other fish species.The contents of Cd and Pb have not significantly differences among the five fish species.(5)Among the five fish species,in addition to the Pseudoperilampus lighti,the comprehensive heavy metal pollution index P in Pseudoperilampus lighti was more than 1.0,showing light pollution.The values of the comprehensive pollution index P in other four fish species(Abbottina rivularis,Ctenogobius giurinus,Hemiculter leucisculus and Hypseleotris swinhonis)were less than 1.0,showing non-pollution and overall situation was better.The comprehensive pollution index P of heavy metals in five fish species in Jingwei Lake National Wetland Park conformed to the order of Pseudoperilampus lighti > Abbottina rivularis >Ctenogobius giurinus > Hemiculter leucisculus > Hypseleotris swinhonis;and for the six heavy metals,the average of pollution index P,Pb(Pi=0.792)>As(Pi=0.338)>Cd(Pi=0.302)>Zn(Pi=0.254)>Hg(Pi=0.114)>Cu(Pi=0.017).Through the investigation of the fish resources and the determination of heavy metals in fish in the Jingwei Lake National Wetland Park,we can find there are still some problems to be solved.Both the sewage from the nearby villagers and the rubbish from the tourists can result in the pollution of the water system to some extent.In addition,the release of non-native fish can cause the invasion of the water system of this area.From this study,we can propose new ideas on protection and utilization of the fish resources of Jingwei Lake National Wetland Park.