2011 Fiscal Year Final Research Report
Application of standard method for extensive estimation of ghost-fishing mortality to international fishing ground
| Project/Area Number |
21580231
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
General fisheries
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| Research Institution | Kagoshima University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
ANRAKU Kazuhiko 鹿児島大学, 水産学部, 准教授 (50274840)
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| Project Period (FY) |
2009 – 2011
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| Keywords | ゴーストフィッシング / 逸失漁具 / 漁業 |
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| Research Abstract |
On-board survey of the fishing gear loss rate in the crab trap fishing ground in the Sea of Japan, interview surveys of fishing gear loss rates in 3 countries and under-water observation of the consequent changesin entry and death of crabs in deliberately-set derelict traps were conducted. The ghost-fishing mortality in a trap was represented with an experimental and theoretical equation as; f_g(t) = a(1-c^t)・(1-b)^t. Annual gear loss rates were 0.2 in Japanese crab-trap fisheryat the Sea of Japan, 0 in coastal fisheries in Thailand and Tanzania, while 0.08 to 0.23 in coastal fisheries in Southern Kyushu. Escape-ring as a countermeasure against ghost fishing was proved to have an additional function to increase large individuals in catch.
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