Fisheries and Resources Monitoring System

Striped marlin - Indian Ocean
Marine Resource  Fact Sheet
Stock status report 2018
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: 2017
Biological State and Trend
State & Trend Descriptors
Exploitation rateSubject to overfishing (F2017/FMSY (80% CI) = 1.99 (1.21–3.62) ) (JABBA Model)High fishing mortality
Abundance levelOverfished (B2017/BMSY (80% CI) = 0.33 (0.18–0.54)) (JABBA Model)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 5362tonnesAverage 1990 - 1999
Catch 3639tonnesAverage 2000 - 2009
Catch 2821tonnes2008
Catch 2400tonnes2009
Catch 2777tonnes2010
Catch 3544tonnes2011
Catch 5066tonnes2012
Catch 4431tonnes2013
Catch 2966tonnes2014
Catch 3336tonnes2015
Catch 4117tonnes2016
Catch 2991tonnes2017

A new stock assessment for striped marlin was carried out in 2018, based on two different models: JABBA, a Bayesian state-space production model; and SS3, an integrated length-based model. Both models were very consistent and confirmed the results from 2012, 2013, 2015 and 2017 assessments. On the weight-of-evidence available in 2018, the stock status of striped marlin is determined to be overfished and subject to overfishing. 
Assessment Model
Type:  Biomass-aggregated
JABBA model
Assessment Model
Type:  Age-structured
Stock Synthesis III (SS3)
Scientific Advice

Current or increasing catches have a very high risk of further decline in the stock status. Current 2017 catches are lower than MSY but the stock has been overfished for more than two decades and is now in a highly depleted state. If the Commission wishes to recover the stock to the green quadrant of the Kobe plot with a probability ranging from 60% to 90% by 2026, it needs to provide mechanisms to ensure the maximum annual catches remain between 1,500 t – 2,200 t.
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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