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| Marine Resource Fact Sheet |
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| Narrow-barred Spanish mackerel - Indian Ocean |
 | Narrow-barred Spanish mackerel 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 - Narrow-barred Spanish mackerel, fr - Thazard rayé indo-pacifique, es - Carite estriado Indo-Pacífico |
Fishery IndicatorsProduction: Catch |
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| Geographic extent of Narrow-barred Spanish mackerel - 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: 2014 |
| 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 Narrow-barred Spanish mackerel - 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 Narrow-barred Spanish mackerel - 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 Genetic studies carried out on Scomberomorus commerson from Djibouti, Oman and United Arab Emirates showed there were small genetic differences among stocks in these three places. The IOTC coordinated Stock Structure Project, which commenced in early-2015, aims to supplement gaps in the existing knowledge on biological data, and in particular provide an insight on whether neritic tuna and tuna like species should be considered as a single Indian Ocean stock. Exploitation Fishery Indicators | Type | Measure | Value | Unit | Time period |
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| Production | Catch | 11318 | tonnes | Average 1950 - 1959 | | Catch | 20277 | tonnes | Average 1960 - 1969 | | Catch | 37593 | tonnes | Average 1970 - 1979 | | Catch | 74210 | tonnes | Average 1980 - 1989 | | Catch | 88669 | tonnes | Average 1990 - 1999 | | Catch | 111382 | tonnes | Average 2000 - 2009 | | Catch | 117609 | tonnes | 2006 | | Catch | 124914 | tonnes | 2007 | | Catch | 123297 | tonnes | 2008 | | Catch | 135028 | tonnes | 2009 | | Catch | 137148 | tonnes | 2010 | | Catch | 144523 | tonnes | 2011 | | Catch | 157636 | tonnes | 2012 | | Catch | 148988 | tonnes | 2013 | | Catch | 152189 | tonnes | 2014 | | Catch | 152798 | tonnes | 2015 |
Assessment Two assessment approaches were applied to narrow-barred Spanish mackerel in 2016, a Catch-MSY analysis and an Optimised Catch Only Method (OCOM). The resulting stock trajectories for both approaches were very similar and gave similar outcomes, and for reporting and stock status advice the OCOM is used, due to the fewer assumptions about final depletion level. Assessment Model Type: Biomass-aggregated Optimised Catch Only Method (OCOM) Scientific Advice There is a continued high to very high risk of exceeding MSY-based reference points by 2023, even if catches are reduced to 80% of the current (2013) levels (67% risk that B2023<BMSY, and 99% risk that F 2023>FMSY). The modelled probabilities of the stock achieving levels consistent with the MSY reference levels (e.g. SB > SBMSY and F<FMSY) in 2023 are 98 and 79%, respectively, for a future constant catch at 70% of current catch level. If the Commission wishes to recover the stock to levels above the MSY reference points, the Scientific Committee recommends that catches should be reduced by at least 30% of current levels which corresponds to catches below to MSY in order to recover the status of the stock. The change in advice from 2015 is due to the fact that the stock biomass has continued to decline, and that catches have continued to increase, resulting in a lower probability of recovering the stock with last year’s recommended reduction in catches. Management Management unit: Yes Source of information IOTC–WPNT06 2016. Report of the 6th Session of the IOTC Working Party on Neritic Tunas. Mahe, Seychelles 21 – 24 June 2016. IOTC–2016–WPNT06– R[E]: 89 pp.  http://www.iotc.org/sites/default/files/documents/2016/08/IOTC-2016-WPNT06-RE_-_FINAL_DO_NOT_MODIFY.pdf |
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