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| Marine Resource Fact Sheet |
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| | 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 - Albacore, fr - Germon, es - Atún blanco, ru - Тунец длинноперый |
Fishery IndicatorsProduction: Catch |
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| Geographic extent of Albacore - 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: 2014 |
| 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 Albacore - 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 Albacore - 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 In the Indian Ocean, there is probably only one southern stock, distributed from 5°N to 40°S, because there is no northern gyre. Exploitation Fishery Indicators | Type | Measure | Value | Unit | Time period |
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| Production | Catch | 3736 | tonnes | Average 1950 - 1959 | | Catch | 17347 | tonnes | Average 1960 - 1969 | | Catch | 17310 | tonnes | Average 1970 - 1979 | | Catch | 22417 | tonnes | Average 1980 - 1989 | | Catch | 30472 | tonnes | Average 1990 - 1999 | | Catch | 35339 | tonnes | Average 2000 - 2009 | | Catch | 35890 | tonnes | 2008 | | Catch | 38205 | tonnes | 2009 | | Catch | 44135 | tonnes | 2010 | | Catch | 33902 | tonnes | 2011 | | Catch | 33355 | tonnes | 2012 | | Catch | 32691 | tonnes | 2013 | | Catch | 38414 | tonnes | 2014 | | Catch | 35628 | tonnes | 2015 | | Catch | 35729 | tonnes | 2016 | | Catch | 38713 | tonnes | 2017 |
Assessment Assessment Model Type: Age-structured Stock Synthesis III (SS3) The WPTmT [Working Party on Temperate Tunas of the IOTC] noted a thorough and in-depth analysis of SS3 was presented with a complete set of diagnostics, in comparison to other stock assessments for which some key diagnostics were not provided. Therefore, the WPTmT agreed that albacore stock status should be determined by the results of the SS3 stock assessments undertaken in 2016 and that the results of the other models should be presented for informative purpose supporting the results of the SS3. Statistical catch-at-age (SCAA) Assessment Model Type: Biomass-aggregated Bayesian biomass dynamics model (BBDM) Bayesian State-Space Production Model (BSPM) A Stock-Production Model Incorporating Covariates (ASPIC) Scientific Advice Catches in 2014 have been marginally above the MSY level of the SS3 model. Fishing mortality represented as F2014/FMSY is 0.85 (0.57–1.12). Biomass is considered to be above the SBMSY level (SB2014/SBMSY = 1.80 (1.38–2.23)) from the SS3 model (Table 1, Fig.1). The results from the other model options were also generally consistent with these estimates of stock status. Thus, the stock status in relation to the Commission’s BMSY and FMSY target reference points indicates that the stock is not overfished and not subject to overfishing (Table 1), although considerable uncertainty remains in the SS3 assessment, particularly due to the lack of biological information on Indian Ocean albacore tuna stocks, indicating that a precautionary approach to the management of albacore tuna should be applied by capping total catch levels to MSY levels (approximately 40000 t; Table 2). Management Management unit: Yes Source of information IOTC–SC21 2018. Report of the 21st Session of the IOTC Scientific Committee. Seychelles, 3 – 7 December 2018. IOTC–2018–SC21–R[E]: 250 pp.  https://iotc.org/sites/default/files/documents/2019/02/IOTC-2018-SC21-RE_FINAL_DO_NOT_MODIFY_Rev1.pdfBibliography All references to figures, tables and bibliography in the text are found within the source of information. |
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