2017 Fiscal Year Final Research Report
Studies on the reliability of stock assessment for TAC species in Japan
| Project/Area Number |
15K07542
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Aquatic bioproduction science
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Research Collaborator |
TERAUCHI Hitomi
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Keywords | 資源量推定 / VPA |
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| Outline of Final Research Achievements |
The variations in the stock size estimates for Japanese sardine, Japanese jack mackerel, etc. were about several to 30% in the coefficient of variation, based on each year's assessment. Fisheries stock management should be conducted considering such variations in the stock size estimates.
Causes of variations were changes in the catch at age, changes in biological characteristic values such as weight at age, and changes in stock assessment methods, besides the random fluctuation of data. Furthermore, bias in the abundance index was suggested as one of the causes of systematic changes in estimates of stock size.
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| Free Research Field |
水産資源学
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