钓鱼岛北部海域光诱敷网渔业资源调查

Investigation on fisheries resources of light- liftnet in northern region of Diaoyu Island

根据2012年7—10月在钓鱼岛北部海域开展的光诱敷网渔业调查资料,结合社会调查数据和以往在该渔场的相关调查资料,着重调查研究了该海域光诱敷网渔业的生产状况、渔获种类、主要渔获种类的生物学特性及其资源开发利用程度。结果表明,钓鱼岛北部海域光诱敷网作业渔场面积约3.09×105km2,7—10月旺汛期渔船生产规模可达200多艘,平均日产5.08 t,光诱敷网作业方式捕捞效果良好,几乎常年均可作业生产,生产渔船经济效益普遍较佳,单船旺汛期产值180×104元左右、单船旺汛期盈利40多万元;渔获种类共有27种,其中鱼类有23种、头足类有4种;主要渔获种类为鲐鱼(Pneumatophorus japonicus)、扁舵鲣(Auxis thazard)、蓝圆鲹(Decapterus maruadsi)和枪乌贼类,分别占总渔获产量的36.8%、27.9%、16.2%和7.8%,这些品种都属于生命周期短、生长速度快、资源补充量相对较大的经济种类,资源开发利用总体较为合理。

Based on the survey data of light - liftnet in northern region of Diaoyu Island during July to October of 2012, combining the social investigations and history data, the production situation, catch species ,the biological characteristics of main species and degree of development and utilization of light - liftnet fishery were studied and analyzed. Results indicated that the area of fishing ground was about 3.09 × 10^5 km2 ,with more than two hundred light -liflnet fishing vessels in the northern region of Diaoyu Island throughout the year and the best fishing period was from July to October. The average daily production was 5.08 t and the production value per vessel in good season was about 1.8 million, which has good economic benefit. There were 27 species which included 23 fish species and 4 cephalopod species. The main species caught, Pneumatophorus japonicus ,Auxis thazard,Decapterus maruadsi and squids, accounted for 36.8% ,27.9% , 16.2% and 7.8% respectively. They were pelagic species with characteristics of short life period, rapid growth rate and large resources recruitment. In general, the resource exploitation and utilization was reasonable.