福建省主要海湾浮性鱼卵和仔稚鱼的种类组成与丰度分布

Composition of species and distribution of abundance of pelagic fish eggs,larvae and juveniles in main bays of Fujian

根据2007年8月至2009年10月期间在福建省主要海湾的调查资料,对其浮性鱼卵和仔稚鱼的种类组成与数量分布特点进行初步研究和探讨.结果表明,本调查海域共出现鱼卵和仔稚鱼68种,隶属于29科,主要是近海中上层鱼类、浅海底层鱼类和港湾河口型鱼类3个生态类型.各站鱼卵总平均丰度是497.5粒/网,仔稚鱼总平均丰度50.8个/网.优势种明显,占总量比例大;不同季节和不同海湾的种类数相差不大;数量平面分布呈现不同季节不同海湾差别较大,规律性不强,偶然性大等特点.

Many coastal constructing projects in Fujian seriously impact fishery resources in sea bays.Distributions of species and abundances of fish eggs,larvae and juveniles,which are very sensitive to environmental change,are important parameters in assessment of fishery resources;however,there are scant data at present.According to the instructions of The Specification for Marine Monitoring,part 7： Ecological survey of offshore pollution and biological monitoring,62 stations in the main bays of Fujian were included in the survey of pelagic fish eggs,larvae and juveniles from August 2007 to October 2009.A total of 30 844 fish eggs and 3 150 larvae and juveniles were obtained.Using the survey data,the distributions of species and abundances of pelagic fish eggs,larvae and juveniles are discussed in this paper.The results show 68 species,belonging to 29 families,which can be classified into three eco-types： epipelagic and mesopelagic fish,shallow-water benthic fish,and estuarine fish.The total mean abundance of fish eggs is 497.5 ind/net,and that of larvae and juveniles is 50.8 ind/net.Dominant species account for a large proportion of the total number of individuals.The number of species is similar for different seasons and bays.The abundance distribution differs for different seasons and bays,and is irregular and random.The data can be used to guide protection of the marine environment and fishery resources,and are basic data for assessment of the marine environmental impact and the use of sea areas of coastal construction projects in Fujian.