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| Marine Resource Fact Sheet |
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| Yellowfin tuna - Indian Ocean |
 | Yellowfin 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 - Yellowfin tuna, fr - Albacore, es - Rabil, ru - Тунец желтоперый |
Fishery IndicatorsProduction: Catch |
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| Geographic extent of Yellowfin tuna - Indian Ocean
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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: 2015 |
| 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 Yellowfin 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 Yellowfin 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 of the RTTP-IO [Regional Tuna Tagging Project-Indian Ocean] provide evidence of large movements of yellowfin tuna, thus supporting the assumption of a single stock for the Indian Ocean. Exploitation Fishery Indicators | Type | Measure | Value | Unit | Time period |
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| Production | Catch | 27539 | tonnes | Average 1950 - 1959 | | Catch | 51698 | tonnes | Average 1960 - 1969 | | Catch | 53345 | tonnes | Average 1970 - 1979 | | Catch | 127960 | tonnes | Average 1980 - 1989 | | Catch | 333524 | tonnes | Average 1990 - 1999 | | Catch | 385292 | tonnes | Average 2000 - 2009 | | Catch | 425942 | tonnes | 2006 | | Catch | 324577 | tonnes | 2007 | | Catch | 321258 | tonnes | 2008 | | Catch | 266935 | tonnes | 2009 | | Catch | 301738 | tonnes | 2010 | | Catch | 329305 | tonnes | 2011 | | Catch | 400501 | tonnes | 2012 | | Catch | 405050 | tonnes | 2013 | | Catch | 408511 | tonnes | 2014 | | Catch | 407573 | tonnes | 2015 |
Assessment In 2016, two models were applied to the update of the 2015 yellowfin tuna stock assessment, both of which give qualitatively similar results. Stock status is based on the Stock Synthesis III model formulation. On the weight-of-evidence available in 2016, the yellowfin tuna stock is determined to be overfished and subject to overfishing. Assessment Model Type: Biomass-aggregated Biomass Dynamic Model (BDM) The WPTT [Working Party on Tropical Tunas of the IOTC] agreed that the base case model run from the SS3 stock assessment would be used for development of management advice for the Scientific Committee’s consideration. The other models (Bayesian biomass production model (BBPM) and Statistical-Catch-At-Age (SCAA)) should be discussed as supporting evidence. Assessment Model Type: Age-structured Stock Synthesis III (SS3) Scientific Advice The stock status determination did not change in 2016, but does give a somewhat more optimistic estimate of stock status than the 2015 assessment as a direct result of the use of more reliable information on catch rates of longline fisheries and updated catch up to 2015. The stock status is driven by unsustainable catches of yellowfin tuna taken over the last four (4) years, and the relatively low recruitment levels estimated by the model in recent years. The Commission has an interim plan for the rebuilding of this stock (Resolution 16/01, which is yet to be evaluated) to achieve the recovery of yellowfin stock, with catch limitations beginning January 1 2017. The projections produced to advise on future catches are, in the short term, driven by the below average recruitment estimated for in recent years since these year classes have yet to reach maturity and contribute to the spawning biomass (see Table 2).
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.pdfBibliography All references to figures, tables and bibliography in the text are found within the source of information. |
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