Fisheries and Resources Monitoring System

Yellowfin tuna - Indian Ocean
Marine Resource  Fact Sheet
Stock status report 2018
Yellowfin tuna - Indian Ocean
Fact Sheet Citation  
Yellowfin tuna Indian Ocean
Owned byIndian Ocean Tuna Commission (IOTC) – More
Related observationsLocate in inventorydisplay tree map
FAO Names: en - Yellowfin tuna, fr - Albacore, es - Rabil, ru - Тунец желтоперый

Fishery Indicators
Production: Catch
Geographic extent of Yellowfin tuna - Indian Ocean
Main Descriptors
Considered a single stock: Yes        Management unit: Yes
Reference year: 2017
Biological State and Trend
State & Trend Descriptors
Exploitation rateSubject to overfishing (F2017/FMSY (plausible range) = 1.20 (1.00–1.71))High fishing mortality
Abundance levelOverfished (SB2017/SBMSY (plausible range) = 0.83 (0.74–0.97))Low abundance
Habitat and Biology
Climatic zone: Temperate; Tropical.   Horizontal distribution: Oceanic.   Vertical distribution: Pelagic.  

Geographical Distribution
Jurisdictional distribution: Highly migratory

Water Area Overview
Geo References
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.
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 27542tonnesAverage 1950 - 1959
Catch 51698tonnesAverage 1960 - 1969
Catch 53344tonnesAverage 1970 - 1979
Catch 127959tonnesAverage 1980 - 1989
Catch 333524tonnesAverage 1990 - 1999
Catch 385291tonnesAverage 2000 - 2009
Catch 321259tonnes2008
Catch 266933tonnes2009
Catch 301737tonnes2010
Catch 327358tonnes2011
Catch 390574tonnes2012
Catch 391948tonnes2013
Catch 397039tonnes2014
Catch 391588tonnes2015
Catch 409423tonnes2016
Catch 409151tonnes2017

In 2018 a new stock assessment was carried out for yellowfin tuna in the IOTC area of competence to update the stock status undertaken in 2016. On the weight-of-evidence available in 2018, the yellowfin tuna stock is determined to remain overfished and subject to overfishing
Assessment Model
Type:  Age-structured
Stock Synthesis III (SS3)

The assessment results were based on a grid of 24 SS3 model runs which are recognized as insufficient to explore the spectrum of uncertainties and scenarios, noting the large uncertainty associated with data quality and lack of considering model statistical uncertainty
Scientific Advice

The decline in stock status to below MSY level is not well understood due to various uncertainties. As a precautionary measure, the Commission should ensure that catches are reduced to end overfishing and allow the SSB to recover to SSBMSY levels. At this stage, specific catch limits are not provided
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.  Click to open
All references to figures, tables and bibliography in the text are found within the source of information.
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