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| Fact Sheet Title 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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| ident Block | ident Block | | | | Species List: | | Species Ref: en - Albacore, fr - Germon, es - Atún blanco, ru - Тунец длинноперый |
Species Ref Type: Measure |
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| ident Block Albacore - Indian Ocean Aq Res Ident Aq Res Ident Aq Res Ident | fao Major |
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| 51 | Indian Ocean, Western |
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| 57 | Indian Ocean, Eastern |
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| Aq Res | Biological Stock: Biological Stock
Management Unit: Management Unit
Reference Year: 2017 |
| 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 Bio Climatic Zone: Temperate; Tropical. Horizontal Dist: Oceanic. Vertical Dist: Pelagic. Geo Dist Geo Dist: Highly migratory Geo Dist  | | Geo Dist Albacore - Indian Ocean
| fao Major | 51: Indian Ocean, Western | | 57: Indian Ocean, Eastern |
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Geo DistAlbacore - Indian Ocean | fao Major | 51:
Indian Ocean, Western | | 57:
Indian Ocean, Eastern | | 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 |
Aq Res Struct Biological Stock: Biological Stock In the Indian Ocean, there is probably only one southern stock, distributed from 5°N to 40°S, because there is no northern gyre. Exploit Fishery Indicator | Fishery Indicator | Fishery Indicator | Fishery Indicator | Fishery Indicator | Fishery Indicator |
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| Type | Measure | 3736 | tonnes | Average 1950 - 1959 | | Measure | 17347 | tonnes | Average 1960 - 1969 | | Measure | 17310 | tonnes | Average 1970 - 1979 | | Measure | 22417 | tonnes | Average 1980 - 1989 | | Measure | 30472 | tonnes | Average 1990 - 1999 | | Measure | 35339 | tonnes | Average 2000 - 2009 | | Measure | 37395 | tonnes | Average 2010 - 2019 | | Measure | 33902 | tonnes | 2011 | | Measure | 33355 | tonnes | 2012 | | Measure | 32691 | tonnes | 2013 | | Measure | 38414 | tonnes | 2014 | | Measure | 35628 | tonnes | 2015 | | Measure | 35761 | tonnes | 2016 | | Measure | 38932 | tonnes | 2017 | | Measure | 41615 | tonnes | 2018 | | Measure | 39517 | tonnes | 2019 | | Measure | 38083 | tonnes | 2020 |
Bio Assess A new stock assessment was carried out for albacore in 2019 to update the assessment undertaken in 2016. The stock assessment was carried out using Stock Synthesis III (SS3), a fully integrated model that is currently also used to provide scientific advice for the three tropical tunas stocks in the Indian Ocean. The model used in 2019 is based on the model developed in 2016 with a series of revisions that were noted during the WPTmT data preparatory meeting held in January 2019. There are some noticeable changes in spatial distribution of longline catches compared to the previous assessment data set, with historical catch shifted to equatorial regions (LL1 and LL2) from southern fisheries (LL3 and LL4). This is due to revisions in the historical catch data carried out since the last assessment. The stock status in relation to the Commission’s BMSY and FMSY target reference points indicates that the stock is not overfished but is subject to overfishing. Assess Models Type: Age-structured Stock Synthesis III (SS3) Sci Advice Although considerable uncertainty remains in the SS3 assessment conducted in 2019, particularly due to the conflicts in key data inputs, a precautionary approach to the management of albacore tuna should be applied. The K2SM indicates that catch reductions are required in order to prevent the biomass from declining to below MSY levels in the short term, due to the low recent recruitment levels. Although there is considerable uncertainty in the projections, current catches are exceeding the estimated MSY level. Management Management: Management Sources IOTC–SC23 2020. Report of the 23rd Session of the IOTC Scientific Committee. Seychelles, 7 – 11 December 2020. IOTC–2020–SC23–R[E]: 211pp.  https://www.iotc.org/sites/default/files/documents/2021/06/IOTC-2020-SC23-RE_Rev1.pdf Bibliography All references to figures, tables and bibliography in the text are found within the source of information. |
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