摘要
为了解长江口北支邻近水域鳗苗网兼捕主要经济鱼类在大小潮期间的分布特征,于2022年2—4月,在该水域设置3个站点,分别在3个大潮和3个小潮期间开展调查。结果表明,主要经济鱼类包括2种洄游性鱼类(刀鲚和凤鲚)、4种海洋性鱼类([鱼免]黄鱼、小黄鱼和半滑舌鳎);共采样72网次,采集到经济种个体数为374尾。刀鲚、凤鲚、[鱼免]、大黄鱼最高单位努力渔获量(CPUE)均出现在大潮期间,小黄鱼CPUE最高值则出现在小潮期间,半滑舌鳎大小潮CPUE值一致。大黄鱼、小黄鱼和半滑舌鳎在大潮期间的体长和体质量中位数均大于小潮期间。刀鲚、凤鲚和[鱼免]最高损伤率均出现在大潮期间的3月1—4日。指出,长江口北支的鳗苗定制网,成为多种经济鱼类洄游通道上的重大阻碍,严重损害其早期资源的可持续发展。
In order to investigate the characteristics of main economic fish species collected by elver net in adjacent water area of north Yangtze River estuary,three survey stations were set up during the three spring tides and three neap tides respectively in the water area from February to April 2022.The main economic species in-cluded two migratory fishes(Coilia nasus and Coilia mystus)and four marine fishes(Michthys miuy,Larim-ichthys crocea,Larimichthys polyactis and Cynoglossus semilaevis).The highest CPUE of Coilia nasus,Coilia mystus,Miichthys miuy and Larimichthys crocea appeared during spring tide.The highest CPUE of Larimichthys polyactis appeared during neap tide,and the CPUE of Cynoglossus semilaevis was the same during spring and neap tide.The median body length and weight of Larimichthys crocea,Larimichthys polyactis and Cynoglossus semilaevis during spring tide were greater than those during neap tide.The highest injury rates of Coilia nasus,Coilia mystus and Michthys miuy all occurred at T1 during spring tide.Elver net in adjacent water area of north Yangtze River estuary has become a major obstacle to the migration channels of various economic fish species,seriously damaging the sustainable development of their early resources.
作者
闫欣
王储庆
施金金
葛慧
王燕平
朱海晨
YAN Xin;WANG Chuqing;SHI Jinjin;GE Hui;WANG Yanping;ZHU Haichen(Marine Fisheries Research Institute of Jiangsu Province,Nantong,Jiangsu 226007,China)
出处
《水产养殖》
2024年第1期22-27,共6页
Journal of Aquaculture
基金
江苏省渔业生态与监测项目(2022-SJ-061-01)
南通市科技项目(MS12021085)。
关键词
长江口
鳗苗网
经济鱼类
兼捕
潮汐
Yangtze River estuary
Elver Net
Economic Fish Species
By-Catch
Tide
作者简介
闫欣(1988-),男,工程师,硕士,研究方向为鱼类早期生活史.E-mail:yx_19880821@163.com;通信作者:葛慧,E-mail:gehui_xi@163.com。
