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| Marine Resource Fact Sheet |
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| Skipjack tuna - Indian Ocean |
 | Skipjack tuna Indian Ocean |
| | Data Ownership | | This document provided, maintained and owned by Indian Ocean Tuna Commission (IOTC) , is part of IOTC Stock Status Reports data collection. |
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| Related observations | Locate in inventory | | | | Species: | | FAO Names: en - Skipjack tuna, fr - Listao, es - Listado, zh - 鲣, ru - Тунец полосатый (=скипджек) |
Fishery IndicatorsProduction: Catch |
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| Geographic extent of Skipjack tuna - Indian Ocean Map tips - Click on
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| FAO Major Fishing Areas |
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| 51 | Indian Ocean, Western |
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| 57 | Indian Ocean, Eastern |
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| Main Descriptors | Considered a single stock: Yes Management unit: Yes
Reference year: 2013 |
| 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. |
| Reference Year: The Reference Year is the last year considered in the stock assessment and/or fishery status. |
| | | | | | Biological State and Trend Habitat and Biology Climatic zone: Temperate; Tropical. Horizontal distribution: Oceanic. Vertical distribution: Pelagic. Geographical Distribution Jurisdictional distribution: Highly migratory Geo References  | | Geographic extent of Skipjack tuna - Indian Ocean
| FAO Major Fishing Areas | 51: Indian Ocean, Western | | 57: Indian Ocean, Eastern |
| | | | | | Intersecting Major FAO areas and LME areas |
The following area codes have been found as intersecting the distribution of Skipjack tuna - Indian Ocean | FAO Major Fishing Areas | 51: Indian Ocean, Western | | 57: Indian Ocean, Eastern | | Large Marine Ecosystem Areas (LME) | 30: Agulhas Current | | 31: Somali Coastal Current | | 32: Arabian Sea | | 33: Red Sea | | 34: Bay of Bengal | | 38: Indonesian Sea | | 39: North Australian Shelf | | 42: Southeast Australian Shelf | | 43: Southwest Australian Shelf | | 44: West-Central Australian Shelf | | 45: Northwest Australian Shelf |
Resource Structure Considered a single stock: Yes The tag recoveries from the RTTP-IO [Regional Tuna Tagging Project-Indian Ocean] provide evidence of rapid, large scale movements of skipjack tuna in the Indian Ocean, thus supporting the current assumption of a single stock for the Indian Ocean. Skipjack tuna in the Indian Ocean are considered a single stock for assessment purposes. Exploitation Fishery Indicators | Type | Measure | Value | Unit | Time period |
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| Production | Catch | 15015 | tonnes | Average 1950 - 1959 | | Catch | 26867 | tonnes | Average 1960 - 1969 | | Catch | 46872 | tonnes | Average 1970 - 1979 | | Catch | 129788 | tonnes | Average 1980 - 1989 | | Catch | 319670 | tonnes | Average 1990 - 1999 | | Catch | 476251 | tonnes | Average 2000 - 2009 | | Catch | 616161 | tonnes | 2006 | | Catch | 465620 | tonnes | 2007 | | Catch | 438425 | tonnes | 2008 | | Catch | 437799 | tonnes | 2009 | | Catch | 423991 | tonnes | 2010 | | Catch | 383205 | tonnes | 2011 | | Catch | 338718 | tonnes | 2012 | | Catch | 434292 | tonnes | 2013 | | Catch | 421430 | tonnes | 2014 | | Catch | 393955 | tonnes | 2015 |
Assessment No new stock assessment was carried out for skipjack tuna in 2015, thus, stock status is determined on the basis of the 2014 assessment and other indicators presented in 2016. On the weight-of-evidence available in 2016, the skipjack tuna stock is determined to be not overfished and is not subject to overfishing. Assessment Model Type: Age-structured Stock Synthesis III (SS3) Scientific Advice If catch remains below the estimated MSY levels, then immediate management measures are not required. However, continued monitoring and improvement in data collection, reporting and analysis is required to reduce the uncertainty in assessments. Management Management unit: Yes Source of information IOTC–WPTT18 2016. Report of the 18th Session of the IOTC Working Party on Tropical Tunas. Seychelles, 5-10 November 2016. IOTC–2016–WPTT18– R[E]: 126 pp.  http://www.iotc.org/sites/default/files/documents/2016/11/IOTC-2016-WPTT18-RE_-_FINAL_0.pdf |
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