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Fact Sheet Title Fact Sheet |
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Black marlin - Indian Ocean |
Black marlin Indian Ocean |
| Data Ownership | This document provided, maintained and owned by Indian Ocean Tuna Commission (IOTC) , is part of IOTC Stock Status Reports data collection. |
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ident Block | ident Block | | Species List: | Species Ref: en - Black marlin, fr - Makaire noir, es - Aguja negra |
Fishery IndicatorsProduction: Catch |
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| ident Block Black marlin - Indian Ocean
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fao Major |
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51 | Indian Ocean, Western |
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57 | Indian Ocean, Eastern |
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Aq Res | Biological Stock: Yes
Management unit: Yes Reference year: 2019 |
Considered a management unit: An aquatic resource or fishery is
declared as [Fishery] Management Unit if it is
effectively the focus for the application of selected
management methods and measures, within the broader
framework of a management system. According to the FAO
Glossary for Responsible Fishing, "a Fishery Management
Unit (FMU) is a fishery or a portion of a fishery
identified in a Fishery Management Plan (FMP) relevant
to the FMP's management objectives." FMU's may be
organised around fisheries biological, geographic,
economic, technical, social or ecological dimensions ,
and the makeup and attribute of a fishery management
unit depends mainly on the FMP's management
objectives. |
Jurisdictional distribution: Jurisdictional qualifier (e.g.
"shared", "shared - highly migratory") of the aquatic
resource related with its spatial distribution. |
Environmental group: Classification of the aquatic
resource according to the environmental group (e.g.
pelagic invertebrate, or demersal fish) to which the
species belong. |
Reference Year: The Reference Year is the last year considered in the stock assessment and/or fishery status. |
| | | | Habitat Bio Climatic Zone: Temperate; Tropical. Horizontal Dist: Oceanic. Vertical Dist: Pelagic. Geo Dist Geo Dist: Highly migratory Geo Dist | Geo Dist Black marlin - Indian Ocean
fao Major | 51: Indian Ocean, Western | 57: Indian Ocean, Eastern |
| | | | Geo Dist |
Geo DistBlack marlin - Indian Ocean fao Major | 51:
Indian Ocean, Western | 57:
Indian Ocean, Eastern | Large Marine Ecosystem Areas (LME) | 30: Agulhas Current | 31: Somali Coastal Current | 32: Arabian Sea | 33: Red Sea | 34: Bay of Bengal | 38: Indonesian Sea | 39: North Australian Shelf | 42: Southeast Australian Shelf | 43: Southwest Australian Shelf | 44: West-Central Australian Shelf | 45: Northwest Australian Shelf |
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. Exploit Fishery Indicators Type | Measure | Value | Unit | Time period |
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Production | Catch | 912 | tonnes | Average 1950 - 1959 | Catch | 1719 | tonnes | Average 1960 - 1969 | Catch | 1483 | tonnes | Average 1970 - 1979 | Catch | 2667 | tonnes | Average 1980 - 1989 | Catch | 4891 | tonnes | Average 1990 - 1999 | Catch | 10325 | tonnes | Average 2000 - 2009 | Catch | 16320 | tonnes | Average 2010 - 2019 | Catch | 13370 | tonnes | 2011 | Catch | 12902 | tonnes | 2012 | Catch | 14813 | tonnes | 2013 | Catch | 18276 | tonnes | 2014 | Catch | 19122 | tonnes | 2015 | Catch | 22397 | tonnes | 2016 | Catch | 15215 | tonnes | 2017 | Catch | 18786 | tonnes | 2018 | Catch | 18068 | tonnes | 2019 | Catch | 16974 | tonnes | 2020 |
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 Management unit: Yes Sources IOTC–SC23 2020. Report of the 23rd Session of the IOTC Scientific Committee. Seychelles, 7 – 11 December 2020. IOTC–2020–SC23–R[E]: 211pp. https://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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