Fisheries and Resources Monitoring System

Indo-Pacific sailfish - Indian Ocean
Marine Resource  Fact Sheet
Stock status report 2018
Indo-Pacific sailfish - Indian Ocean
Fact Sheet Citation  
Indo-Pacific Sailfish Indian Ocean
Owned byIndian Ocean Tuna Commission (IOTC) – More
Related observationsLocate in inventorydisplay tree map
FAO Names: en - Indo-Pacific sailfish, fr - Voilier indo-pacifique, es - Pez vela del Indo-Pacífico, ru - Парусник индо-тихоокеанский

Fishery Indicators
Production: Catch
Geographic extent of Indo-Pacific sailfish - Indian Ocean
Main Descriptors
Considered a single stock: Yes        Management unit: Yes
Reference year: 2014
Biological State and Trend
State & Trend Descriptors
Exploitation rateSubject to overfishing (F2014/FMSY (80% CI) = 1.05 (0.63–1.63))High fishing mortality
Abundance levelNot overfished (B2014/BMSY (80% CI) = 1.13 (0.87–1.37))Intermediate 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 stock structure of Indo-Pacific sailfish in the Indian Ocean is uncertain: apparently there are local reproductively isolated stocks. At least one stock was reported in the Persian Gulf with no or very little intermixing with open Indian Ocean stocks. However outside of the Gulf no stock differentiation has been determined; thus for the purposes of assessment, one pan-ocean stock is assumed. However, spatial heterogeneity in stock indicators (catch– per–unit–effort trends) for other billfish species indicates that there is potential for localised depletion. 
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 633tonnesAverage 1950 - 1959
Catch 1197tonnesAverage 1960 - 1969
Catch 1347tonnesAverage 1970 - 1979
Catch 3480tonnesAverage 1980 - 1989
Catch 9966tonnesAverage 1990 - 1999
Catch 17934tonnesAverage 2000 - 2009
Catch 20986tonnes2008
Catch 25143tonnes2009
Catch 27797tonnes2010
Catch 25915tonnes2011
Catch 27385tonnes2012
Catch 30026tonnes2013
Catch 28279tonnes2014
Catch 29556tonnes2015
Catch 28218tonnes2016
Catch 33320tonnes2017

In 2015, data poor methods for stock assessment using Stock reduction analysis (SRA) techniques indicate that the stock is not yet overfished, but is subject to overfishing (Table 1). In using the SRA method for comparative purposes with other stocks, the use of the target reference points may be possible for the approach. In addition, a Bayesian Surplus Production Model indicated that the stock could be severely overfished so this is a less pessimistic outlook on the stock status. The stock appears to show a continued increase in catch rates which is a cause of concern, indicating that fishing mortality levels may be becoming too high (Fig. 1). 
Assessment Model
Type:  Biomass-aggregated
Stock-reduction analysis (SRA)

Since 2015 was the first year the BSPM model was applied, the Stock Reduction Analysis (SRA) has been kept as the basis for current stock status advice.
Bayesian State-Space Production Model (BSPM)
Scientific Advice

The same management advice for 2016 (catches below a MSY of 25000 t) is kept for the next year (2017).
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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