文章摘要
莱州湾秋季弓子网网囊网目尺寸选择性研究
Study on the Selectivity of Codend Mesh of Beam Trawl in Laizhou Bay in Autumn
投稿时间:2019-08-01  修订日期:2019-10-31
DOI:
中文关键词: 弓子网  莱州湾  逃逸率  选择性  网囊网目尺寸
英文关键词: beam trawl  Laizhou Bay  escape ratio  selectivity  codend mesh size
基金项目:农业农村部财政专项(2018)资助
作者单位E-mail
许庆昌 农业农村部海洋渔业可持续发展重点实验室农业农村部极地渔业开发重点实验室中国水产科学研究院黄海水产研究所 青岛 266071 xuqc@ysfri.ac.cn 
李显森 农业农村部海洋渔业可持续发展重点实验室农业农村部极地渔业开发重点实验室中国水产科学研究院黄海水产研究所 青岛 266071 lixs@ysfri.ac.cn 
孙珊 农业农村部海洋渔业可持续发展重点实验室农业农村部极地渔业开发重点实验室中国水产科学研究院黄海水产研究所 青岛 266071  
樊钢洲 农业农村部海洋渔业可持续发展重点实验室农业农村部极地渔业开发重点实验室中国水产科学研究院黄海水产研究所 青岛 266071  
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中文摘要:
      单船框架拖网(俗称弓子网)是渤海区常见的作业渔具,对底栖渔业生物选择性差,作业过程中产生大量副渔获物。为改善网囊网目选择性,2017年9月在莱州湾海域采用“套网法”对网囊网目尺寸分别为15、25、35、45和55mm的5种网囊进行了选择性试验。结果表明,弓子网对渔获物种类的选择能力较差,具有捕获栖息于作业海域绝大多数底栖种类的能力。随网囊网目尺寸的增加,渔获物质量、尾数和产值损失率逐渐增大,短吻红舌鳎、口虾蛄、鹰爪虾和日本鼓虾的选择性参数(L0.5、SR)呈线性增加。口虾蛄和鹰爪虾的选择体长L0.5与网目尺寸(m)的线性回归方程分别为L0.5=1.472m+12.63(R2=0.934)和L0.5=1.394m+0.724(R2=0.920)。在目前渔业资源状况下,为保护口虾蛄、鹰爪虾等经济渔获物资源,兼顾生产效益和幼鱼资源保护,建议将弓子网最小网目尺寸放大至45mm。
英文摘要:
      Beam trawl is one of the common fishing gears using in Bohai Sea area, which produces lots of by-catch for its poor selectivity. To improve the selectivity of codend mesh, the authors carried out selective experiments on the codend mesh of beam trawl in the Laizhou Bay during September, 2017. Cover net method was used and five kinds of codends (the mesh size was 15, 25, 35, 45 and 55mm, respectively) were studied. Results showed that beam trawl had a poor selectivity for catch species, it can capture most of the benefic species that inhabiting in the operation area. Escape rates of the catch in weight, number and value increased with the increase of codend mesh size. The 50% selectivity body length (L0.5) and selection range of C. joyneri, O. oratoria, T. curvirostris and A. japonicus increased linearly as the mesh size increased. The L0.5 of O. oratoria and T. curvirostris appeared to be a linear relationship with codend mesh size (m), and the linear regression equations were L0.5=1.472m+12.63 (R2=0.934) and L0.5=1.394m+0.724 (R2=0.920), respectively. In order to protect the economic catch species such as O. oratoria, T. curvirostris, and so on, the authors suggested the minimum mesh size of the beam trawl need to be enlarged to 45mm which can maintain production efficiency and protect juvenile fish resources.
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