Fisheries and Resources Monitoring System

Black marlin - Indian Ocean
Marine Resource  Fact Sheet
Stock status report 2018
Black marlin - Indian Ocean
Fact Sheet Citation  
Black marlin Indian Ocean
Owned byIndian Ocean Tuna Commission (IOTC) – More
Related observationsLocate in inventorydisplay tree map
FAO Names: en - Black marlin, fr - Makaire noir, es - Aguja negra

Fishery Indicators
Production: Catch
Geographic extent of Black marlin - Indian Ocean
Main Descriptors
Considered a single stock: Yes        Management unit: Yes
Reference year: 2017
Biological State and Trend
State & Trend Descriptors
Exploitation rateNot assessed/Uncertain (F2017/FMSY (80% CI) = 0.96 (0.77-1.12))Uncertain/Not assessed
Abundance levelNot assessed/Uncertain (B2017/BMSY (80% CI) = 1.68 (1.32-2.10))Uncertain/Not assessed
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

No information on stock structure is currently available in the Indian Ocean; thus for the purposes of assessment, one pan-ocean stock is assumed.
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 912tonnesAverage 1950 - 1959
Catch 1719tonnesAverage 1960 - 1969
Catch 1485tonnesAverage 1970 - 1979
Catch 2735tonnesAverage 1980 - 1989
Catch 5183tonnesAverage 1990 - 1999
Catch 10160tonnesAverage 2000 - 2009
Catch 10958tonnes2008
Catch 11380tonnes2009
Catch 10067tonnes2010
Catch 13345tonnes2011
Catch 13067tonnes2012
Catch 14570tonnes2013
Catch 17482tonnes2014
Catch 18333tonnes2015
Catch 21733tonnes2016
Catch 21229tonnes2017
Level of uncertainty: High

A stock assessment based on JABBA was conducted in 2018 for black marlin. The JABBA model indicated that the stock is not subject to overfishing and is currently not overfished.
Assessment Model
Type:  Biomass-aggregated
Overall Assessment Results

However these status estimates are subject to a high degree of uncertainty. The recent sharp increases in total catches and conflicts in information in CPUE and catch data lead to large uncertainties in the assessment outputs.
Scientific Advice

Current catches are considerably higher than MSY estimate, which is likely to associate with high uncertainty. The catch limits as stipulated in Resolution 18/05 have been exceeded. The Commission should provide mechanisms to ensure that catch limits are not exceeded by all concerned fisheries.
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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