Fisheries and Resources Monitoring System

Striped Marlin - Indian Ocean
Marine Resource  Fact Sheet
Stock status report 2016
Striped Marlin - Indian Ocean
Fact Sheet Citation  
Striped marlin Indian Ocean
Owned byIndian Ocean Tuna Commission (IOTC) – More
Related observationsLocate in inventorydisplay tree map
FAO Names: en - Striped marlin, fr - Marlin rayé, es - Marlín rayado

Fishery Indicators
Production: Catch
Geographic extent of Striped Marlin - 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) = 1.09 (0.62–1.66))High fishing mortality
Abundance levelOverfished (B2014/BMSY (80% CI) = 0.65 (0.45–1.17))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

Several transoceanic migrations were reported in the Indian Ocean (the longest is from Kenya to Australia). Therefore a single stock hypothesis apparently is most appropriate for stock assessement and management.
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 1036tonnesAverage 1950 - 1959
Catch 3117tonnesAverage 1960 - 1969
Catch 3485tonnesAverage 1970 - 1979
Catch 5204tonnesAverage 1980 - 1989
Catch 5360tonnesAverage 1990 - 1999
Catch 3618tonnesAverage 2000 - 2009
Catch 4008tonnes2006
Catch 3010tonnes2007
Catch 2731tonnes2008
Catch 2400tonnes2009
Catch 2751tonnes2010
Catch 3131tonnes2011
Catch 5848tonnes2012
Catch 4806tonnes2013
Catch 4212tonnes2014
Catch 4410tonnes2015

No new assessment was done in 2016. In 2015 an ASPIC stock assessment confirmed the assessment results from 2012 and 2013 that indicated the stock is currently subject to overfishing and that biomass is below the level which would produce MSY. Two approaches examined in 2015 came to similar conclusions, namely a Bayesian Surplus Production Model, and a Stock Reduction Analysis using only catch data.
Assessment Model
Type:  Biomass-aggregated
A Stock-Production Model Incorporating Covariates (ASPIC)
Scientific Advice

A precautionary approach to the management of striped marlin should be considered by the Commission to reduce catches below 4000 t thereby ensuring the stock may rebuild to sustainable levels.
Management unit: Yes
Source of information
IOTC–WPB14 2016. Report of the 14thSession of the IOTC Working Party on Billfish. Victoria, Seychelles, 2016. IOTC–2016–WPB14–R[E]: 94 pp.  Click to open
Striped marlin supporting information for the 14th Session of the IOTC Working Party on Billfish. 2016.  Click to open
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