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Albacore - Indian Ocean
Marine Resource  Fact Sheet
Stock status report 2016
Albacore - Indian Ocean
Fact Sheet Citation  
Albacore Indian Ocean
Owned byIndian Ocean Tuna Commission (IOTC) – More
Related observationsLocate in inventorydisplay tree map
 
Species:
FAO Names: en - Albacore, fr - Germon, es - Atún blanco, ru - Тунец длинноперый

Fishery Indicators
Production: Catch
Geographic extent of Albacore - Indian Ocean
Main Descriptors
Considered a single stock: Yes        Management unit: Yes
Reference year: 2014
 
 
Biological State and Trend
State & Trend Descriptors
PartnerFIRMS
Exploitation rateNot subject to overfishing (F2014/FMSY (80% CI) = 0.85 (0.57–1.12))Moderate fishing mortality
Abundance levelNot overfished (SBcurrent/SBMSY (80% CI) = 1.80 (1.38–2.23))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


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
TypeMeasureValueUnitTime period
ProductionCatch 3734tonnesAverage 1950 - 1959
Catch 17344tonnesAverage 1960 - 1969
Catch 17290tonnesAverage 1970 - 1979
Catch 22149tonnesAverage 1980 - 1989
Catch 30193tonnesAverage 1990 - 1999
Catch 34845tonnesAverage 2000 - 2009
Catch 29329tonnes2006
Catch 37994tonnes2007
Catch 35171tonnes2008
Catch 37423tonnes2009
Catch 43359tonnes2010
Catch 33025tonnes2011
Catch 32710tonnes2012
Catch 32196tonnes2013
Catch 39025tonnes2014
Catch 34726tonnes2015
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–WPTmT06 2016. Report of the Sixth Session of the IOTC Working Party on Temperate Tunas. Shanghai, China, 18–21 July 2016. IOTC–2016–WPTmT06–R[E]: 58 pp.  Click to openhttp://iotc.org/sites/default/files/documents/2016/10/IOTC-2016-WPTmT06-RE_FINAL_DO_NOT_MODIFY.pdf
Bibliography
 
Albacore supporting information for the Sixth Session of the IOTC Working Party on Temperate Tunas. 2016.  Click to openhttp://www.iotc.org/sites/default/files/documents/science/species_summaries/english/Albacore%20Supporting%20Information.pdf
All references to figures, tables and bibliography in the text are found within the source of information.
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