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Blue and red shrimp - Northern Alboran Sea
Fact Sheet Title  Fact Sheet
Stock status report 2021
Blue and red shrimp - Northern Alboran Sea
Fact Sheet Citation  
Aristeus antennatus - Northern Alboran Sea (GSA 1)
Owned byGeneral Fisheries Commission for the Mediterranean (GFCM) – ownership
ident Blockident Blockdisplay tree map
 
Species List:
Species Ref: en - Blue and red shrimp, fr - Crevette rouge, es - Gamba rosada

Fishery Indicators
Production: Landed Volume
ident Block Blue and red shrimp - Northern Alboran Sea
Aq Res
Biological Stock: No         Value: Sub-Regional
Reference year: 2019
 
 
Aq Res State Trend
Aq Res State Trend
Aq Res State Trend Aq Res State Trend
Aq Res State TrendIn overexploitation (F/Fref = 2.27)Not applicable
Aq Res State TrendNot applicable
Aq Res State Trend
Aq Res State TrendOverfished

In overexploitation.
[The GFCM methodology to provide stock status and management advice is described in the Appendix F of the Sixteenth Session of the Scientific Advisory Committee Report. See the Bibliography section.]
Habitat Bio
Climatic Zone: Temperate.   Bottom Type: Soft bottom.   Depth Zone: Slope (200 m - 1000 m); Abyssal ( >1000m).   Horizontal Dist: Neritic; Oceanic.   Vertical Dist: Demersal/Benthic.  

Water Area Overview
Spatial Scale: Sub-Regional

Water Area Overview
Aq Res Struct
Biological Stock: No


Stock assessment in the GFCM area of application is often conducted by management units, based on GSAs. This method does not ensure that the whole stock is assessed, since stocks may cover several different management units. In some cases, when there is scientific evidence of a stock spreading through different GSAs, as well as information on species from different GSAs, existing information is combined across GSAs. This is then defined as a “joint stock assessment of a shared stock”. The GFCM recommends that when scientific evidence of shared stocks exists, joint stock assessments should be attempted. A number of activities aimed at achieving a better definition of stock boundaries are currently being conducted at the GFCM level. [The State of Mediterranean and Black Sea Fisheries, 2016]
Exploit
 

Blue and red shrimp is the most important resource of slope bottom trawling in GSA 1 (northern Alboran Sea) and is targeted by the largest vessels of the deep-water trawl fleet segment. The trawlers catch red shrimp on the slope on muddy bottoms between depths of 400 m to 800 m. A total of 46 vessels (2019) had fishing activities directed towards blue and red shrimp in the GSA 1 fishing ground. This segment fleet, catches about 120 tonnes of red shrimp per year (average 2017-2019).
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionLanded Volume 169.3tonnes2002
Landed Volume 289.82tonnes2003
Landed Volume 276.92tonnes2004
Landed Volume 243.66tonnes2005
Landed Volume 239.42tonnes2006
Landed Volume 192.68tonnes2007
Landed Volume 143.48tonnes2008
Landed Volume 121.6tonnes2009
Landed Volume 135.76tonnes2010
Landed Volume 140.68tonnes2011
Landed Volume 141.73tonnes2012
Landed Volume 125.15tonnes2013
Landed Volume 168.09tonnes2014
Landed Volume 176.57tonnes2015
Landed Volume 130.24tonnes2016
Landed Volume 108.12tonnes2017
Landed Volume 110.21tonnes2018
Landed Volume 140.99tonnes2019
Bio Assess
 
Data

The assessment was carried out using official landings and data on the size composition of trawl catches for 2002-2019. Catch-at-length data were converted into catch-at-age data by cohort slicing procedures. Length-weight relationship and maturity ogive come from the Spanish DCF and natural mortality vector was estimated using PRODBIOM (Abella et al., 1997).
Assess Models
Type:  Age-structured
a4a

The state of exploitation of this stock was assessed by means of VPA XSA (Shepherd, 1999) and SCAA model (a4a) (Jardim and Millar, 2014). The assessment was performed using abundance index series from MEDITS trawl surveys. Y/R analyses was conducted based on the exploitation pattern resulting from a4a model and population parameters.
Results

R declined until 2007 and has been relatively stable over the 2008-2015 period, increasing in the last two years. SSB showed a decreasing trend in 2015-2017 period, increasing in the last year. Fishing mortality (Fbar 0-2) with values close to 1 in the 2007-2017 period, going up to 1.27 in the last year.
Sci Advice

Reduce fishing mortality.
Sources
 
FAO. 2021. General Fisheries Commission for the Mediterranean (GFCM). Report of the twenty-second session of the Scientific Advisory Committee on Fisheries, online, 22–25 June 2021. FAO Fisheries and Aquaculture Report No. 1347. Rome. Click to openhttps://www.fao.org/3/cb7622en/cb7622en.pdf
Report of the Working Group on Stock Assessment of Demersal Species (WGSAD). Online, 18–23 January 2021. Click to openhttps://www.fao.org/gfcm/technical-meetings/detail/en/c/1412431/
GFCM Stock Assessment Results (STAR) for blue and red shrimp in GSA 1 (reporting year: 2021). Click to openhttps://gfcm.sharepoint.com/EG/_layouts/15/download.aspx?share=EWpu4Ocxq1lMn9lnorrsHvUBVdP57qcth5ZEtvCl2YuBjA
Bibliography
 
FAO. 2020. The State of Mediterranean and Black Sea Fisheries 2020. General Fisheries Commission for the Mediterranean. Rome. Click to openhttps://www.fao.org/3/cb2427en/cb2427en.pdf
FAO. 2016. The State of Mediterranean and Black Sea Fisheries. General Fisheries Commission for the Mediterranean. Rome, Italy. Click to openhttps://www.fao.org/3/i5496e/i5496e.pdf
FAO General Fisheries Commission for the Mediterranean/Commission générale des pêches pour la Méditerranée. Report of the sixteenth session of the Scientific Advisory Committee. St. Julian’s, Malta, 17–20 March 2014/Rapport de la seizième session du Comité scientifique consultatif. Saint Julien, Malte, Malte, 17-20 mars 2014. FAO Fisheries and Aquaculture Report/FAO Rapport sur les pêches et l’aquaculture. No. R1102. Rome. 2015. 250 pp. Click to openhttps://www.fao.org/3/i4381b/i4381b.pdf
General Fisheries Commission for the Mediterranean (GFCM) Stock Assessment Results (STAR). Click to openhttps://www.fao.org/gfcm/data/star/en/
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