Population reproductive potential: Evaluation of long-term stock productivity.
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- KATSUKAWA TOSHIO
- Fish Population Dynamics Group, Ocean Research Institute, University of Tokyo
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- MATSUDA HIROYUKI
- Fish Population Dynamics Group, Ocean Research Institute, University of Tokyo
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- MATSUMIYA YOSHIHARU
- Fish Population Dynamics Group, Ocean Research Institute, University of Tokyo
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In order to avoid recruitment overfishing, fish stocks must have sufficient reproductive ability. The spawning stock biomass (SSB), which ignores the value of immature fish, is widely used as an index of stock sustainability. From the perspective of sustainability, immediate reproduction, as well as future spawning, must be considered. We developed an index of long-term stock productivity, called the population reproductive potential (PRP). PRP is defined as the expected total reproductive value of the standing stock. We used PRP to assess the western Atlantic bluefin tuna (WBT) stock. The trends in SSB, numbers (N), biomass and PRP of WBT are inconsistent when compared to each other, due to fluctuation in age composition. We evaluated the long-term productivity of WBT by computer simulation and compared the result with trends in the abundance indices. The result of the computer simulation was highly consistent with the trend in the PRP. Short-term trends in SSB and N often do not reflect long-term stock trends, because they are highly sensitive to age-composition dynamics. The PRP is useful for evaluating stock trends, especially when the age composition is unstable.
収録刊行物
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- Fisheries science
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Fisheries science 68 (5), 1106-1112, 2002
公益社団法人 日本水産学会
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詳細情報 詳細情報について
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- CRID
- 1390001204428651136
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- NII論文ID
- 130003742481
- 10009716918
- 30014677952
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- NII書誌ID
- AA10993718
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- COI
- 1:CAS:528:DC%2BD38XosVShsb0%3D
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- ISSN
- 14442906
- 09199268
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- NDL書誌ID
- 6455403
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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