台湾海峡鲐鱼捕捞群体结构及资源开发利用状况

The Fishing Population Structure and Resources Utilization Status of Pneumatophorus japonicus in Taiwan Strait

本文根据2003～2004年台湾海峡渔业资源调查资料,结合以往闽南、台湾浅滩渔场鲐鲹鱼类监测资料,研究分析了台湾海峡鲐鱼捕捞群体结构及资源开发利用状况。结果表明:台湾海峡鲐鱼资源主要为灯光围网作业和拖网作业所利用;5、6月在灯光围网作业主要渔获物中鲐鱼占绝对优势,其余各月所占比重均较低,其渔获群体优势叉长组为230～260mm,占60.8%,平均叉长246.1mm,资源利用较合理;而拖网作业捕捞群体以0龄鱼和1龄鱼为主。定点调查表明5月鲐鱼数量分布的主要密集区出现在闽南、台湾浅滩渔场的近岸海域,以幼鱼为主,8月群体较为分散,密集度不高。为合理利用鲐鱼资源,应加强对灯光围网作业扶持力度。

According to the fisheries resources investigation in Taiwan strait during 2003 to 2004, combining with monitoring data of pelagic fish in Minnan-Taiwan bank fishing ground during 1990 to 2004, this paper analyzed the fishing population structure and resources utilization status of Pneumatophorus japonicus in Taiwan strait. The results showed that Pneumatophorus japonicus was utilized by light seine and trawler, it was dominant catch by light seine in May and June, and the percent of yield were lower in the others month, the dominant fork length were 230～260mm, occupying (60.8%), the average was (246.1)mm, the resources utilization was reasonable; And trawler's fishing population mainly consists of age 0 to age 1 year-classes, the investigation of single trawler have indicated that main dense zone of Pneumatophorus japonicus population in May appeared in the coastal waters of Minnan-Taiwan bank fishing ground and mostly was juvenile, and the population relative decentralized in August. This paper suggested that it is needed to strengthen support of light seine for reasonable utilization of Pneumatophorus japonicus resources.