Fisheries and Resources Monitoring System

Skipjack tuna - Indian Ocean
Marine Resource  Fact Sheet
Stock status report 2018
Skipjack tuna - Indian Ocean
Fact Sheet Citation  
Skipjack tuna Indian Ocean
Owned byIndian Ocean Tuna Commission (IOTC) – More
Related observationsLocate in inventorydisplay tree map
FAO Names: en - Skipjack tuna, fr - Listao, es - Listado, zh - 鲣, ru - Тунец полосатый (=скипджек)

Fishery Indicators
Production: Catch
Geographic extent of Skipjack tuna - Indian Ocean
Main Descriptors
Considered a single stock: Yes        Management unit: Yes
Reference year: 2016
Biological State and Trend
State & Trend Descriptors
Exploitation rateNot subject to overfishing (C2016/C40%SSB (80% CI) = 0.88 (0.72-0.98))No or low fishing mortality
Abundance levelNot overfished (SB2016/SB40%SSB (80% CI) = 1.00 (0.88–1.17))Pre-exploitation biomass or high 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 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.
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 15015tonnesAverage 1950 - 1959
Catch 26867tonnesAverage 1960 - 1969
Catch 46918tonnesAverage 1970 - 1979
Catch 130080tonnesAverage 1980 - 1989
Catch 319670tonnesAverage 1990 - 1999
Catch 476251tonnesAverage 2000 - 2009
Catch 438425tonnes2008
Catch 437799tonnes2009
Catch 423991tonnes2010
Catch 383091tonnes2011
Catch 344354tonnes2012
Catch 437862tonnes2013
Catch 428742tonnes2014
Catch 405214tonnes2015
Catch 474412tonnes2016
Catch 524282tonnes2017

No new stock assessment was carried out for skipjack tuna in 2018, thus, stock status is determined on the basis of the 2017 assessment and other indicators presented in 2018. On the weight-of-evidence available in 2017, 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

Based on the results of the stock assessment of skipjack tuna in 2017, the Commission, following Resolution 16/02, adopted an annual catch limit of 470,029 tonnes for the years 2018 to 2020. The Commission needs to ensure that catches of skipjack in the 2018–2020 period do not exceed the agreed limit
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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