Fisheries and Resources Monitoring System

Narrow-barred Spanish mackerel - Indian Ocean
Marine Resource  Fact Sheet
Stock status report 2016
Narrow-barred Spanish mackerel - Indian Ocean
Fact Sheet Citation  
Narrow-barred Spanish mackerel Indian Ocean
Owned byIndian Ocean Tuna Commission (IOTC) – More
Related observationsLocate in inventorydisplay tree map
FAO Names: en - Narrow-barred Spanish mackerel, fr - Thazard rayé indo-pacifique, es - Carite estriado Indo-Pacífico

Fishery Indicators
Production: Catch
Geographic extent of Narrow-barred Spanish mackerel - Indian Ocean
Main Descriptors
Considered a single stock: Yes        Management unit: Yes
Reference year: 2014
Biological State and Trend
State & Trend Descriptors
Exploitation rateSubject to overfishing (F2014/FMSY (80% CI) = 1.21 (0.95–1.48))High fishing mortality
Abundance levelOverfished (B2014/BMSY (80% CI) = 0.95 (0.74–1.27))Low abundance
Habitat and Biology
Climatic zone: Temperate; Tropical.   Horizontal distribution: Oceanic.   Vertical distribution: Pelagic.  

Geographical Distribution
Jurisdictional distribution: Highly migratory

Water Area Overview
Geo References
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.
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 11318tonnesAverage 1950 - 1959
Catch 20277tonnesAverage 1960 - 1969
Catch 37593tonnesAverage 1970 - 1979
Catch 74210tonnesAverage 1980 - 1989
Catch 88669tonnesAverage 1990 - 1999
Catch 111382tonnesAverage 2000 - 2009
Catch 117609tonnes2006
Catch 124914tonnes2007
Catch 123297tonnes2008
Catch 135028tonnes2009
Catch 137148tonnes2010
Catch 144523tonnes2011
Catch 157636tonnes2012
Catch 148988tonnes2013
Catch 152189tonnes2014
Catch 152798tonnes2015

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 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.  Click to open
Narrow-barred Spanish mackerel supporting information for the 6th Session of the IOTC Working Party on Neritic Tunas. 2016.  Click to open
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