Fisheries and Resources Monitoring System

Narrow-barred Spanish mackerel - Indian Ocean
Marine Resource  Fact Sheet
Stock status report 2021
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: 2019
Biological State and Trend
State & Trend Descriptors
Exploitation rateSubject to overfishing (F2019/FMSY (80% CI) =1.24 (0.65–2.13))High fishing mortality
Abundance levelOverfished (B2019/BMSY (80% CI) = 0.80 (0.54–1.27))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 74815tonnesAverage 1980 - 1989
Catch 90969tonnesAverage 1990 - 1999
Catch 115134tonnesAverage 2000 - 2009
Catch 166786tonnesAverage 2010 - 2019
Catch 149728tonnes2011
Catch 164957tonnes2012
Catch 167633tonnes2013
Catch 180924tonnes2014
Catch 182392tonnes2015
Catch 185755tonnes2016
Catch 175805tonnes2017
Catch 155585tonnes2018
Catch 163556tonnes2019
Catch 157687tonnes2020

No new assessment was conducted for narrow-barred Spanish mackerel in 2021 and so the results are based on the assessment carried out in 2020 using the Optimised Catch-Only Method (OCOM). The OCOM model indicates that the stock is being exploited at a rate exceeding FMSY in recent years, and the stock appears to be below BMSY. An analysis undertaken in 2013 in the Northwest Indian Ocean (Gulf of Oman) indicated that overfishing is occurring in this area and that localised depletion may also be occurring1. Based on the weight-of-evidence available, the stock appears to be overfished and subject to overfishing (Table 1, Fig. 2). Catches since 2012 and also recent average catches for 2015-2019 have been above or close to the current MSY estimate of 157,760 t in recent years (Fig. 1).
Assessment Model
Type:  Biomass-aggregated
Optimised Catch Only Method (OCOM)
Scientific Advice

The catch in 2019 was just below the estimated MSY and the available gillnet CPUE shows a somewhat increasing trend in recent years although the reliability of the index as an abundance index remains unknown. Despite the substantial uncertainties, the stock is probably very close to being fished at MSY levels and higher catches may not be sustained.
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.  Click to open
All references to figures, tables and bibliography in the text are found within the source of information.
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