Fisheries and Resources Monitoring System

Black marlin - Indian Ocean
Fact Sheet Title  Fact Sheet
Stock status report 2021
Black marlin - Indian Ocean
Fact Sheet Citation  
Black marlin Indian Ocean
Owned byIndian Ocean Tuna Commission (IOTC) – ownership
ident Blockident Blockdisplay tree map
Species List:
Species Ref: en - Black marlin, fr - Makaire noir, es - Aguja negra

Fishery Indicators
Production: Catch
ident Block Black marlin - Indian Ocean
Aq Res
Biological Stock: Yes        Management unit: Yes
Reference year: 2019
Aq Res State Trend
Aq Res State Trend
Aq Res State Trend Aq Res State Trend
Aq Res State TrendNot assessed/Uncertain (F2019/FMSY (95% CI) = 0.53 (0.22 – 1.05)Uncertain/Not assessed
Aq Res State TrendNot assessed/Uncertain (B2019/BMSY (95% CI) = 1.98 (1.42 – 2.57)Uncertain/Not assessed
Habitat Bio
Climatic Zone: Temperate; Tropical.   Horizontal Dist: Oceanic.   Vertical Dist: Pelagic.  

Geo Dist
Geo Dist: Highly migratory

Geo Dist
Geo Dist
Aq Res Struct
Biological 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 1483tonnesAverage 1970 - 1979
Catch 2667tonnesAverage 1980 - 1989
Catch 4891tonnesAverage 1990 - 1999
Catch 10325tonnesAverage 2000 - 2009
Catch 16320tonnesAverage 2010 - 2019
Catch 13370tonnes2011
Catch 12902tonnes2012
Catch 14813tonnes2013
Catch 18276tonnes2014
Catch 19122tonnes2015
Catch 22397tonnes2016
Catch 15215tonnes2017
Catch 18786tonnes2018
Catch 18068tonnes2019
Catch 16974tonnes2020
Bio Assess
Uncertainty: High

A stock assessment based on JABBA, a Bayesian state-space production model (age-aggregated) was conducted in 2021 for black marlin. The Kobe plot from the JABBA model indicated that the stock is not subject to overfishing and is currently not overfished, however these status estimates are subject to a high degree of uncertainty. Since 2018, there has been no discernible improvement in the data available for black marlin and the subsequent assessment outputs remain uncertain and should be interpreted with caution. As such, there is no reasonable justification to change the stock status from “Not assessed/Uncertain”. 
Assess Models
Type:  Biomass-aggregated
Sci Advice

The 2020 catches (16,977 t) (Fig. 1) were substantially higher than the MSY limits stipulated in Res (18/05) which is 9,932 t. The Commission should provide mechanisms to ensure that catch limits are not exceeded by all concerned fisheries. Projections were not carried out due to the poor predictive capabilities identified in the assessment diagnostics.
Management unit: Yes
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 open
All references to figures, tables and bibliography in the text are found within the source of information.
powered by FIGIS  © FAO, 2024
Powered by FIGIS