Fisheries and Resources Monitoring System

Skipjack tuna - Indian Ocean
Marine Resource  Fact Sheet
Stock status report 2016
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: 2013
Biological State and Trend
State & Trend Descriptors
Exploitation rateNot subject to overfishing (C2013/CMSY (80% CI) = 0.62 (0.49–0.75))No or low fishing mortality
Abundance levelNot overfished (SB2013/SBMSY (80% CI) = 1.59 (1.13–2.14))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 46872tonnesAverage 1970 - 1979
Catch 129788tonnesAverage 1980 - 1989
Catch 319670tonnesAverage 1990 - 1999
Catch 476251tonnesAverage 2000 - 2009
Catch 616161tonnes2006
Catch 465620tonnes2007
Catch 438425tonnes2008
Catch 437799tonnes2009
Catch 423991tonnes2010
Catch 383205tonnes2011
Catch 338718tonnes2012
Catch 434292tonnes2013
Catch 421430tonnes2014
Catch 393955tonnes2015

No new stock assessment was carried out for skipjack tuna in 2015, thus, stock status is determined on the basis of the 2014 assessment and other indicators presented in 2016. On the weight-of-evidence available in 2016, 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

If catch remains below the estimated MSY levels, then immediate management measures are not required. However, continued monitoring and improvement in data collection, reporting and analysis is required to reduce the uncertainty in assessments.
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.  Click to open
Skipjack tuna supporting information for the 17th Session of the IOTC Working Party on Tropical Tunas. 2016.  Click to open
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