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Blue and red shrimp - Alboran Island
Fact Sheet Title  Fact Sheet
Stock status report 2021
Blue and red shrimp - Alboran Island
Fact Sheet Citation  
Aristeus antennatus - Alboran Island (GSA 2)
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 - Alboran Island
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 = 1.67)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 2 (Alboran Island) and is targeted by the largest vessels of the deep-water trawl fleet segment. In GSA 2, bottom trawls operate mainly in the middle slope, targeting blue and red shrimp. In this area, fishing trips last for four to five days, in contrast of the rest of the western Mediterranean, where fishing trips for trawlers only last a single day. The main base port of this fleet is Almeria (66 tonnes landed in 2019), and the fishing period goes from May to October. A total of 14 vessels (average 2017-2019) had fishing activities directed towards the blue and red shrimp in the GSA 2 fishing ground. This segment fleet, catches yearly about 56 tonnes of this species per year (average 2017-2019).
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionLanded Volume 68tonnes2009
Landed Volume 49tonnes2010
Landed Volume 47.4tonnes2011
Landed Volume 45tonnes2012
Landed Volume 63.9tonnes2013
Landed Volume 41tonnes2014
Landed Volume 51.9tonnes2015
Landed Volume 40.1tonnes2016
Landed Volume 48tonnes2017
Landed Volume 47.5tonnes2018
Landed Volume 71.9tonnes2019
Bio Assess
 
Data

The assessment was carried out using official landings and data on the size composition of trawl catches for the years 2009-2019. Catch-at-length data were converted into catch-at-age data by cohort slicing by sex procedures. Length-weight relationship and maturity ogive come from Spanish DCF and the natural mortality vector was estimated using PRODBIOM (Abella et al., 1997).
Assess Models
Type:  Age-structured
XSA

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

R declined until 2014 and decreased over the 2017-2019 period. SSB remain stabilized from 2013. Fishing mortality (Fbar 1-3) was stabilized around values close to 0.5 in the 2014-2018 period, with a slight increase in the last year of the series.
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 2 (reporting year: 2021). Click to openhttps://gfcm.sharepoint.com/EG/_layouts/15/download.aspx?share=ERKvzPE-H2NKmbA04Q3MtIoBycA-ZwfR-03dfozZN44tlw
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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