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2010年9月至2011年8月采用定置网对福建九龙江口水域的鱼类群落进行了调查,该河口区鱼类生物有169种,隶属于18目63科118属,其中鲈形目最多(89种),占总种数的52.7%;其次为鲤形目(18种)和鲱形目(16种),分别占总种数的10.7%和9.5%。暖水性鱼类种类最多(59.8%),暖温性种类次之(37.8%),冷温性种类最少(2.3%)。岛美站位鱼类种类数最多(98种),浮宫站位次之(96种),紫泥站位种类最少(87种),而Shannon-Weaver多样性指数以岛美站位最高,浮宫站位最低,其平均值分别为2.816 8和2.060 4。研究水域周年渔获物全年出现频率大于50%的优势种类有中华小公鱼(Anchoviell achinensis)、眶棘双边鱼(Ambassis gymnocephalus)和前鳞鲻(Mudil affinis)3种。渔获量以秋季最高,夏季次之,冬季最低。全年鱼类群聚特征与河口径流关系密切,即汛期浮宫站位(交汇区)的鱼类群落与紫泥站位(淡水区)的相似,而其他时间浮宫站位(交汇区)的鱼类群落则与岛美站位(咸水区)的相似。
From September 2010 to August 2011, the fish communities in the waters of Jiulong River Estuary in Fujian Province were surveyed by using the set-up network. There were 169 species of fish in the estuarine area, belonging to 18 orders, 63 families and 118 genera, of which the percrosses were the most 89 species), accounting for 52.7% of the total species; followed by Cypriniformes (18 species) and herring species (16 species), accounting for 10.7% and 9.5% of the total species, respectively. The species of warm-water fish is the most (59.8%), the warm-temperate species is the second (37.8%) and the cold-temperate species is the least (2.3%). The number of fish species in the island station was the highest (98 species), followed by the floating node (96 species), and that of purple vermilion species was the least (87 species), while the Shannon-Weaver diversity index Floating station has the lowest average of 2.8168 and 2.0604 respectively. The dominant species of Anchoviell achinensis, Ambassis gymnocephalus and Mudil affinis were more than 50% of annual catch in study waters. Catches the highest in autumn, summer followed, the lowest in winter. The clustering characteristics of fish during the whole year are closely related to the runoff in the river mouth, that is, the fish community in the floating station (intersection area) during the flood season is similar to the purple soil station (fresh water area) Of the fish communities are similar with the island United States station (salt water area).