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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
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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: 2019 |
| 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 assessment 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 | 5202 | tonnes | Average 1980 - 1989 | | Catch | 5356 | tonnes | Average 1990 - 1999 | | Catch | 3799 | tonnes | Average 2000 - 2009 | | Catch | 3726 | tonnes | Average 2010 - 2019 | | Catch | 3666 | tonnes | 2011 | | Catch | 5142 | tonnes | 2012 | | Catch | 4371 | tonnes | 2013 | | Catch | 3315 | tonnes | 2014 | | Catch | 3804 | tonnes | 2015 | | Catch | 4614 | tonnes | 2016 | | Catch | 3508 | tonnes | 2017 | | Catch | 2749 | tonnes | 2018 | | Catch | 3001 | tonnes | 2019 | | Catch | 2586 | tonnes | 2020 |
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 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.  https://www.iotc.org/sites/default/files/documents/2021/06/IOTC-2020-SC23-RE_Rev1.pdfBibliography All references to figures, tables and bibliography in the text are found within the source of information. |
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