春夏季闽江口和兴化湾鱼类数量特征的研究

为了考察春夏季闽江口和兴化湾鱼类数量特征,利用2008年4月(春季)和9月(夏季)这两个海域渔业资源调查资料,研究这两个不同生态类型海域鱼类密度的时空分布,分析优势种特征、以及地形地貌、海流和水文等因素对鱼类分布的影响。结果表明,春季闽江口鱼类重量密度(165.31kg/km2)和尾数密度(15.89×103ind/km2)都低于兴化湾重量密度(638.4kg/km2)和尾数密度(19.73×103ind/km2),夏季相反,闽江口鱼类重量密度(1728.83kg/km2)和尾数密度(158.81×103ind/km2)远远大于兴化湾重量密度(1378.20kg/km2)和尾数密度(58.15×103ind/km2)。这些与闽江口和兴化湾鱼类资源生态特征有一定的关系:依据优势性分析,在兴化湾,优势种以地方种为主,除了六指马鲅,其它主要优势种优势性不明显,对总密度变化的贡献不大。而闽江口,优势种大多是洄游性经济鱼类,其中凤鲚重量密度和尾数密度明显高于其它优势种。春季洄游性鱼类尚未游到闽江口海域产卵,这是闽江口鱼类资源重量密度远远小于兴化湾的原因。夏季有较多鱼类洄游到闽江口,是这一海域鱼类数量激增的主要原因。春季...

Comparison of fish density between the Minjiang Estuary and Xinghua Bay during spring and summer

To study ecological characteristics of the fish density,this paper compared the spatial-temporal distribution of fish density between the Minjiang Estuary and Xinghua Bay,involved in some impact factors such as dominant species,background of topography and geomorphy,as well as hydrological features,based on the data from four oceanographic censuses in the two kinds of waters during April( spring) and September ( summer) 2008. Results showed that weight density( 165. 31 kg /km2) and individual density( 15. 8...