瓯江干流丽水段渔业资源的初步研究

Preliminary Investigation of Fishery Resources in Lishui Section of Oujiang River

2009年3月、2009年6月—2010年2月,作者在瓯江干流丽水段设3个采样点,每月一次对瓯江干流丽水段的渔业资源进行了调查和分析。共采集鱼类标本2 579尾,分别隶属于5目,13科,41属,53种。其中,鲤形目鱼类种数最多,鲤科鱼类37种,占样本总数的69.81%,其次是鲇形目和鲈形目;鳗鲡目和合鳃鱼目种数较少,仅1种。全年优势种为圆吻鲴(Distoechodon tumirostris)、大眼华鳊(Sinibrama macrops)和黄颡鱼(Pel-teobagrus fulvidraco),分别占样本总数的33.00%、12.52%和11.36%;Margalef丰富度指数(D)2009年7月～翌年1月呈递减趋势,其中2009年7月最高。Shannon-Wiener多样性指数(H')月变化幅度不大,只是2009年7月和8月稍高。Pielou均匀度指数(J')全年较恒定。瓯江干流丽水段主要经济鱼类有唇鱼骨、鮠科鱼类(黄颡鱼等)、斑鳜和鳜等。2009年6月平均密度最高为15.53尾/网,全年在st.2采到的鱼类种数最多(40种),在st.3采到的鱼类种数最少(27种)。

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.