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| Marine Resource Fact Sheet |
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| | Bigeye tuna - Western and Central Pacific Ocean (WCPO), 2005 |
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| | Owned by | Inter-American Tropical Tuna Commission (IATTC)
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| Main Descriptors | Considered a single stock: Yes
Spatial Scale: Regional Considered a management unit: Yes |
| Considered a single stock: A group of individuals in a species occupying a well defined spatial range independent of other stocks of the same species. It can be affected by random dispersal movements and directed migrations due to seasonal or reproductive activity. |
| Spatial Scale: Spatial scale contains a standard term such as Global, Regional (e.g. for the whole Atlantic), sub-regional (e.g. for a part of the Atlantic), national, local (for sub-national levels). |
| Considered a management unit: An aquatic resource or fishery is
declared as [Fishery] Management Unit if it is
effectively the focus for the application of selected
management methods and measures, within the broader
framework of a management system. According to the FAO
Glossary for Responsible Fishing, "a Fishery Management
Unit (FMU) is a fishery or a portion of a fishery
identified in a Fishery Management Plan (FMP) relevant
to the FMP's management objectives." FMU's may be
organised around fisheries biological, geographic,
economic, technical, social or ecological dimensions ,
and the makeup and attribute of a fishery management
unit depends mainly on the FMP's management
objectives. |
| Jurisdictional distribution: Jurisdictional qualifier (e.g.
"shared", "shared - highly migratory") of the aquatic
resource related with its spatial distribution. |
| Environmental group: Classification of the aquatic
resource according to the environmental group (e.g.
pelagic invertebrate, or demersal fish) to which the
species belong. |
| | | | | | Habitat and Biology Bottom type: Unspecified Depth zone: Abyssal Horizontal distribution: Oceanic Vertical distribution: Pelagic Geographical Distribution Jurisdictional distribution: Highly migratory Geo References  | | Distribution of Bigeye tuna - Western and Central Pacific Ocean (WCPO)
| Pacific Tuna East-West reporting areas | WCPO: West Central Pacific Ocean |
| | | | | | Intersecting Major FAO areas and LME areas |
The following area codes have been found as intersecting the distribution of Bigeye tuna - Western and Central Pacific Ocean (WCPO) | (LME) Large Marine Ecosystem Areas | 1: Eastern Bering Sea | | 2: Gulf of Alaska | | 10: Insular Pacific-Hawaiien | | 34: Bay of Bengal | | 35: Gulf of Thailand | | 36: South China Sea | | 37: Sulu-Celebes Sea | | 38: Indonesian Sea | | 39: North Australian Shelf | | 40: Northeast Australian Shelf/Great Barrier Reef | | 41: East-Central Australian Shelf | | 42: Southeast Australian Shelf | | 46: New Zealand Shelf | | 47: East China Sea | | 48: Yellow Sea | | 49 | | 50: Sea of Japan | | 51 | | 52 | | 53 |
Resource Structure Considered a single stock: Yes Management Considered a management unit: Yes Biological State and Trend Exploitation state: Fully exploited
The current bigeye assessment indicates the stock is not in an overfished state although current fishing mortality rates are approaching or exceeding the overfishing benchmark. The current level of exploitation appears not to be sustainable in the long term, unless the high recent recruitment is maintained in the future. Lower future recruitment is a possibility if the recruitment trends for bigeye in the EPO are mirrored in the WCPO. Should recruitment fall to average levels, current catch levels would result in stock reductions to near and possibly below MSY-based reference points. Reduction of juvenile fishing mortality in the equatorial regions would have significant benefits for both the bigeye tuna stock and the longline fishery. On this basis, the SCTB recommended that, as a minimum measure, there be no further increase in the fishing mortality rate for bigeye tuna from the recent level. Bibliography “Stock assessment of bigeye tuna in the western and central Pacific Ocean. Standing Committee on Tuna and Billfish, Majuro, Marshall Islands, August, 2004. 73 p.” Hampton, J., P. Kleiber, A. Langley, and K. Hiramatsu 2004 SCTB-17/SA-2 SCTB  . “The Western and Central Pacific tuna fishery: 2003: overview and status of stocks. xix 66 p.” Langley, A., Hampton, J., Williams, P. and Lehodey, P. 2005 Tuna Fisheries Assessment Report 6 SPC  . |
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