摘要
在九龙江口湾区设置3个断面共9个站位,于2007年11月～2008年8月按季度采用浅水I型浮游生物网进行垂直拖网和表层水平拖网,并在2号站位进行中层水平拖网。共采集到仔、稚鱼1763尾,鉴定出33种,隶属于16属15科。其中垂直拖网167尾(密度为1.97ind.m-3),表层水平拖网965尾(密度为0.30ind.m-3),中层水平拖网631尾(密度为5.39ind.m-3)。调查结果表明,虾虎鱼类(Gobiidae)占绝对优势,普氏细棘虾虎鱼(Acentrogobius pflaumi)、美肩鳃鳚(Omobranchus elegans)、斑(Konosirus punctatus)、鳀(Engraulis japonicus)和白姑鱼(Argyrosomus argentatus)等为主要优势种。春季种类数最多(22种),冬季仅为5种。春季的平均密度最大,秋季和冬季的密度最小。中层水域仔、稚鱼种类数和数量均多于表层水域,且在水层分布也存在种类差异。比较以往的研究成果,在种类组成和主要优势种方面均发生了一些变化。
In order to study the species composition and abundance of fish larvae and juveniles, seasonal collections （9 stations） were conducted with a plankton net （50 cm mouth-diameter, 145 cm net length, 0. 505 mm mesh-aperture） in Jiulong River estuary from November of 2007 to August of 2008. Horizontal surface towing and vertical towing were carried out in each station. Middle layer towing was made at station 2. A total of 1 763 fish larvae and juveniles were collected, belonging to 33 species, 16 genus, 15 families. In them, 167 individuals were collected by oblique towing （ the average density was 1.97 ind·m^-3 ）, 965 individuals were collected by horizontal surface towing （the average density was 0. 30 ind·m^-3）, 631 individuals were collected by a middle layer towing （the average density was 5. 39 ind·m^-3 ）. The dominant species were Gobiidae fishes, Acentrogobius pflaumi, Omobranchus elegans, Konosirus punctatus, Engraulis japonicus and Argyrosomus argentatus. The species numbers of fish larvae and juveniles were the greatest in spring （22） and the least in winter （5）. Also the average density in spring were the highest in summer and the lowest in autumn and winter. There were more species and numbers of larvae and juveniles in middle layer than in surface, and there were different distribution of larvae and juveniles in different layers. Compared with the previous researches, some changes were observed in species composition and the dominant species.
出处
《南方水产》
2009年第4期1-8,共8页
South China Fisheries Science
基金
厦门市海洋与渔业局重点项目"厦门海域渔业资源本底调查"
关键词
九龙江口
仔
稚鱼
种类组成
季节变化
Jiulong River estuary
larvae and juveniles
species composition
seasonal variation
