Preliminary Investigation of Fishery Resources in Lishui Section of Oujiang River

This paper deals with the survey of fish resources and analysis of species diversity in Lishui section of Oujiang River.Fish were collected monthly at 3 stations in March 2009,June 2009 and February 2010.The results showed that a total of 2 579 fish were collected.The total of 53 species belong to 5 orders,13 families,and 41 genera.The species of Cypinifomes has the highest number in population,37 species belong to Cyprinidae,accounting for 69.81% of total samples.The Siluriformes and Perciformes came in second.The numbers of species of the Anguilliformes and Synbranchiformes were comparatively smaller,only 1 species.The dominant species were Distoechodon tumirostris,Sinibrama macrops,Pelteobagrus fulvidraco,accounting for 33.00%,12.52%and 11.36% of the total samples.The characters of the fish fauna can be divided into the marine fishes and freshwater fishes among the catch.The Margalef index was decling during the period from July 2009 to January 2010,the highest being in July 2009.The Shannon-Wiener diversity index was invariable throughout the whole year and relatively high in July and August 2009.The Pielou evenness index was inariable throughout the whole year.Hemibarbus laleo,Bagridae,Siniperca scherzeri,Siniperca chuatsi were the main economic species in the Lishui section of Oujiang River.The average density reached 15.53 ind./net on June 2009.The number of species collected in station 2 was the largest in a year,which was 40.The number of species collected in station 3 was the smallest in a year,which was 27.