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| Marine Resource Fact Sheet |
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| Striped marlin - Indian Ocean |
 | Striped 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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| Related observations | Locate in inventory | | | | Species: | | FAO Names: en - Striped marlin, fr - Marlin rayé, es - Marlín rayado |
Fishery IndicatorsProduction: Catch |
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| Geographic extent of Striped marlin - Indian Ocean Map tips - Click on
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| FAO Major Fishing Areas |
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| 51 | Indian Ocean, Western |
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| 57 | Indian Ocean, Eastern |
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| Main Descriptors | Considered a single stock: Yes Management unit: Yes
Reference year: 2017 |
| Considered a single stock: A group of individuals in a species occupying a well defined spatial range independent of other stocks of the same species. It can be affected by random dispersal movements and directed migrations due to seasonal or reproductive activity. |
| Spatial Scale: Spatial scale contains a standard term such as Global, Regional (e.g. for the whole Atlantic), sub-regional (e.g. for a part of the Atlantic), national, local (for sub-national levels). |
| 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. |
| | | | | | Biological State and Trend Habitat and Biology Climatic zone: Temperate; Tropical. Horizontal distribution: Oceanic. Vertical distribution: Pelagic. Geographical Distribution Jurisdictional distribution: Highly migratory Geo References  | | Geographic extent of Striped marlin - Indian Ocean
| FAO Major Fishing Areas | 51: Indian Ocean, Western | | 57: Indian Ocean, Eastern |
| | | | | | Intersecting Major FAO areas and LME areas |
The following area codes have been found as intersecting the distribution of Striped marlin - Indian Ocean | FAO Major Fishing Areas | 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 |
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. Exploitation Fishery Indicators | Type | Measure | Value | Unit | Time period |
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| Production | Catch | 1036 | tonnes | Average 1950 - 1959 | | Catch | 3117 | tonnes | Average 1960 - 1969 | | Catch | 3485 | tonnes | Average 1970 - 1979 | | Catch | 5204 | tonnes | Average 1980 - 1989 | | Catch | 5362 | tonnes | Average 1990 - 1999 | | Catch | 3639 | tonnes | Average 2000 - 2009 | | Catch | 2821 | tonnes | 2008 | | Catch | 2400 | tonnes | 2009 | | Catch | 2777 | tonnes | 2010 | | Catch | 3544 | tonnes | 2011 | | Catch | 5066 | tonnes | 2012 | | Catch | 4431 | tonnes | 2013 | | Catch | 2966 | tonnes | 2014 | | Catch | 3336 | tonnes | 2015 | | Catch | 4117 | tonnes | 2016 | | Catch | 2991 | tonnes | 2017 |
Assessment 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 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 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.  https://iotc.org/sites/default/files/documents/2019/02/IOTC-2018-SC21-RE_FINAL_DO_NOT_MODIFY_Rev1.pdfBibliography All references to figures, tables and bibliography in the text are found within the source of information. |
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