乐清湾流刺网游泳生物多样性分析

Diversity Analysis of Nekton in Yueqing Bay using Gillnetting

根据2016年5月、8月、11月和2017年2月在乐清湾利用流刺网开展渔业资源调查,对乐清湾游泳生物的种类组成、数量分布以及季节变化规律进行了分析。结果表明,共捕获游泳生物37种,分别隶属于7目20科,其中鲈形目最多有13种,占总种类的36.11%,十足目次之有12种,占总种类的33.33%。乐清湾游泳生物主要以洄游性种类为主,定居性种类较少,全年优势种为三疣梭子蟹和龙头鱼,IRI分别为14 021.84、1 221.16。乐清湾游泳生物夏季数量最多,春季数量最少;冬季的优势种与常见种的种类最多,春季种类较少;冬季多样性指数(H′=3.23)为最高;秋季的丰富度指数(D=4.20)高于其他季节。

According to the fishery resources investigation was conducted using gillnetting in Yueqing bay in May,August,November 2016 and February 2017,the species composition,quantitative distribution and seasonal variation of nekton in Yueqing bay were analyzed.The results showed that a total of 37 species were captured in Yueqing bay,which belonged to 7 orders and 20 families.The species of Perciformes were the most abundant accounting for 13 species and for 36.11%of the total species.Decapoda took second place,accounting for 12 species and for 33.33%of the total species.Yueqing bay nekton were mainly based on migratory species,colonist species were less.The dominant species in the whole year were mainly swiming crab(Portunus trituberculatus)and bombayduck(Harpodon nehereus),and IRI was respectively 14 021.84 and 1 221.16.Yueqing bay had the largest number of nekton in summer and lowest in spring.The dominant species and common species in winter were the most species,while fewer in spring.The winter diversity index(H′=3.23)was the highest,and the autumn abundance index(D=4.20)was higher than other seasons.