Preliminary Trawling Tests using a Two-level Beam Trawl with Square Mesh Separator and its Separation Efficiency.

• Kajikawa Yoritake

  Department of Fishery Science and Technology, National Fisheries University

• Fujiishi Akio

  Department of Fishery Science and Technology, National Fisheries University

• Inoue Satoru

  Department of Fishery Science and Technology, National Fisheries University

• Nagamatu Kimiaki

  Department of Fishery Science and Technology, National Fisheries University

• Hamano Akira

  Department of Fishery Science and Technology, National Fisheries University

Bibliographic Information

Other Title

• 分離漁獲装置付き２階式小型底曳網の分離効果
• ブンリ ギョカク ソウチ ツキ 2カイシキ コガタ ソコビキアミ ノ ブンリ

Abstract

A two-level beam trawl was developed with a square-mesh separator panel in it to separate marketable fish and shrimp from non-commercial crabs and smaller fish. The net-mouth of the lower cod-end in the two-level trawl gear was covered with a square-mesh net panel as a separator. Fishing experiments of the gear were conducted with a chartered trawler off Shimonoseki city in October 1995. Two square-mesh net panels of 40 and 50mm mesh bars were used in the fishing experiments. The net mouth openings of the upper and lower cod-end associated with the efficiency of the separator were measured. The total number of animals caught in 7 hauls was nearly 2, 300. Separation efficiencies defined as the ratio of the catch in the upper cod-end to the total catch of 11 species were compared by two mesh bar sizes. Non-commercial crabs passed through the separator panel and then entered in the lower one, while shrimp were caught in the upper cod-end although its body was enough small to pass through the separator. Separation efficiencies of the main 6 species plotted versus bodysize indicate that the separator has size-selectivity to some extent. Thus, the gear was useful to catch fish of marketable size and shrimp in the upper cod-end.

Journal

• NIPPON SUISAN GAKKAISHI

  NIPPON SUISAN GAKKAISHI 64 (2), 189-196, 1998

  The Japanese Society of Fisheries Science

Keywords

• 小型底曳網
• 分離漁獲
• 2階式網
• 角目網

Details

• CRID: 1390282681387851264
• NII Article ID: 10004852771
• NII Book ID: AN00193422
• DOI: 10.2331/suisan.64.189
• ISSN: 1349998X
• ISSN: 00215392
• ISSN: http://id.crossref.org/issn/00215392
• NDL BIB ID: 4437707
• Web Site: https://agriknowledge.affrc.go.jp/RN/2010572375
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4437707
• Text Lang: ja
• Data Source:
  • JaLC
  • IRDB
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed