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Striped marlin - Indian Ocean
Marine Resource  Fact Sheet
Stock status report 2021
Striped marlin - Indian Ocean
Fact Sheet Citation  
Striped marlin Indian Ocean
Owned byIndian Ocean Tuna Commission (IOTC) – More
Related observationsLocate in inventorydisplay tree map
 
Species:
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: 2019
 
 
Biological State and Trend
State & Trend Descriptors
PartnerFIRMS
Exploitation rateSubject to overfishing (F2019/FMSY (80% CI) = 2.04 (1.348 - 2.931)) (JABBA Model)High fishing mortality
Abundance levelOverfished (B2019/BMSY (80% CI) =0.320 (0.216 - 0.505)) (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 assessment and management.
Exploitation
 
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 1036tonnesAverage 1950 - 1959
Catch 3117tonnesAverage 1960 - 1969
Catch 3485tonnesAverage 1970 - 1979
Catch 5202tonnesAverage 1980 - 1989
Catch 5356tonnesAverage 1990 - 1999
Catch 3799tonnesAverage 2000 - 2009
Catch 3726tonnesAverage 2010 - 2019
Catch 3666tonnes2011
Catch 5142tonnes2012
Catch 4371tonnes2013
Catch 3315tonnes2014
Catch 3804tonnes2015
Catch 4614tonnes2016
Catch 3508tonnes2017
Catch 2749tonnes2018
Catch 3001tonnes2019
Catch 2586tonnes2020
Assessment
 

In 2021 a stock assessment was conducted based on two different models: JABBA, a Bayesian state-space production model (age-aggregated); and SS3, an integrated model (age-structured). Both models were generally consistent with regards to stock status and confirmed the results from 2012, 2013, 2015, 2017 and 2018 assessments. On the weight-of-evidence available in 2021, 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. The current 2020 catches (2,587 t; Fig. 1) are lower than MSY (4,601 t) but the stock has been overfished for more than a decade 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 as per Resolution 18/05, it needs to provide mechanisms to ensure the maximum annual catches remain between 900 t – 1,500 t (Table 3).
Management
Management unit: Yes
Source of information
 
IOTC–SC23 2020. Report of the 23rd Session of the IOTC Scientific Committee. Seychelles, 7 – 11 December 2020. IOTC–2020–SC23–R[E]: 211pp.  Click to openhttps://www.iotc.org/sites/default/files/documents/2021/06/IOTC-2020-SC23-RE_Rev1.pdf
Bibliography
 
All references to figures, tables and bibliography in the text are found within the source of information.
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