布兰斯菲尔德海峡南极磷虾资源密度及渔获个体时空特征  

Spatiotemporal characteristics of resource density and catch individual of Antarctic krill in the Bransfield Strait

作　　者：李帅 杨嘉 赵国庆 李灵智[1] 饶欣[1] 黄洪亮[1] LI Shuai;YANG Jialiang;ZHAO Guoqing;LI Lingzhi;RAO Xin;HUANG Hongliang(Key Laboratory of Oceanic and Polar Fisheries,Ministry of Agriculture and Rural Affairs,East China Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences,Shanghai 200090,China)

机构地区：[1]中国水产科学研究院东海水产研究所,农业农村部远洋与极地渔业创新重点实验室,上海200090

出　　处：《海洋渔业》2025年第2期243-252,共10页Marine Fisheries

基　　金：国家重点研发计划(2022YFC2807504);中国水产科学研究院基本科研业务费资助项目(2023TD03);上海市极地前沿科学研究基地开放课题基金(SCO2024-15)。

摘　　要：布兰斯菲尔德海峡为南极磷虾主要捕捞区域,为了进一步研究该海域南极磷虾资源分布及生物学特征,基于2018/19渔季中国南极磷虾商业捕捞数据,从时间和空间两个维度对南极磷虾CPUE(catch per unit fishing effort,CPUE)、体长及年龄组成进行了分析。结果表明,布兰斯菲尔德海峡南极磷虾CPUE月间差异显著(P<0.001),4—7月平均CPUE整体呈下降趋势;CPUE沿海峡呈东北-西南向分布,高值区多分布在海峡东北海域(58°45′00"~59°45′00"W、62°52′30"~63°07′30"S)。空间冷热点分析结果表明,CPUE热点主要位于海峡东北海域,核心冷点和次冷点主要分布在海峡西南海域和东南海域。不同月间南极磷虾体长差异显著(P<0.001),平均体长变化范围为39.72~44.51 mm;平均体长低值区沿东北-西南走向平行分布于海峡西缘的南设得兰群岛近岸海域,高值区多分布在海峡中部及海峡东缘的南极半岛近岸海域。不同月间南极磷虾年龄组成差异较大,5月年龄组成以3~+龄为主,其余月份以2~+龄为主;年龄组成整体上由西北向东南增大,海峡西缘的南设得兰群岛近岸海域年龄组成略低于海峡中部及海峡东缘的南极半岛近岸海域。Antarctic krill,as a key species in the Southern Ocean ecosystem,is also an important group in the world's pelagic fisheries.Studies show that the distribution of Antarctic krill is not uniform,showing a significant patchy distribution,more than 50%of Antarctic krill is distributed in the southwest of the South Atlantic Ocean.Bransfield Strait is also one of the important fishing areas of Antarctic krill.CPUE(catch per unit fishing effort),as an important index to analyze resource density,is a commonly used method to assess fishery resources.The growth of Antarctic krill has an important impact on the annual renewal rate of its resources and is an important parameter to study the change and distribution of its resources,and the length is a key factor to analyze its growth rate.Therefore,it is very important to understand the basic biological characteristics of Antarctic krill such as length and population age structure.In order to further study the spatiotemporal characteristics of resource density and catch individual of Antarctic krill in this area,CPUE,length and age composition of Antarctic krill were analyzed from two dimensions of time and space based on the commercial krill fishing data of Chinese during the 2018/19 fishing season.The results showed that the CPUE of Antarctic krill in the Bransfield Strait varied significantly between months(P<0.001),with an overall decreasing trend in the average CPUE from April to July.The CPUE was distributed in a northeast-southwest direction along the strait,with most of the high-value zones located in the northeastern part of the strait(58°45′00″-59°45′00″W,62°52′30″-63°07′30″S).The results of the spatial hot(cold)spot analysis showed that the hotspot of CPUE was mainly located in the northeastern sea area of the strait,and the core cold spot and sub-cold spot were mainly distributed in the southwestern and southeastern sea area of the strait.The body length of krill in different months was significantly different(P<0.001),and the average length v

关 键 词：南极磷虾 CPUE 体长 年龄结构 时空分布 

分 类 号：S932[农业科学—渔业资源]