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Fact Sheet Title Fact Sheet |
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Blue and red shrimp - Alboran Island |
Aristeus antennatus - Alboran Island (GSA 2) |
| Data Ownership | This document provided, maintained and owned by General Fisheries Commission for the Mediterranean (GFCM) , is part of GFCM Stock Status Reports data collection. |
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ident Block | ident Block | | Species List: | Species Ref: en - Blue and red shrimp, fr - Crevette rouge, es - Gamba rosada |
Species Ref Type: Measure |
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| ident Block Blue and red shrimp - Alboran Island Aq Res Ident Aq Res Ident Aq Res Ident gfcm Sub Area |
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2 | Alboran Island |
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Aq Res | Biological Stock: Biological Stock Value: Sub-Regional Reference Year: 2019 |
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. |
| | | | Aq Res State Trend 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 1000m; Abyssal >1000m. Horizontal Dist: Neritic; Oceanic. Vertical Dist: Demersal/Benthic. Water Area Overview Spatial Scale: Spatial Scale Water Area Overview | Water Area Overview Blue and red shrimp - Alboran Island
gfcm Sub Area | 2: Alboran Island |
| | | | Water Area Overview
| | | | Water Area Overview |
Water Area OverviewBlue and red shrimp - Alboran Island Aq Res Struct Biological Stock: Biological Stock 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 Indicator Fishery Indicator | Fishery Indicator | Fishery Indicator | Fishery Indicator | Fishery Indicator |
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Type | Measure | 68 | tonnes | 2009 | Measure | 49 | tonnes | 2010 | Measure | 47.4 | tonnes | 2011 | Measure | 45 | tonnes | 2012 | Measure | 63.9 | tonnes | 2013 | Measure | 41 | tonnes | 2014 | Measure | 51.9 | tonnes | 2015 | Measure | 40.1 | tonnes | 2016 | Measure | 48 | tonnes | 2017 | Measure | 47.5 | tonnes | 2018 | Measure | 71.9 | tonnes | 2019 |
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. https://www.fao.org/3/cb7622en/cb7622en.pdfReport of the Working Group on Stock Assessment of Demersal Species (WGSAD). Online, 18–23 January 2021. https://www.fao.org/gfcm/technical-meetings/detail/en/c/1412431/ Bibliography FAO. 2020. The State of Mediterranean and Black Sea Fisheries 2020. General Fisheries Commission for the Mediterranean. Rome. https://www.fao.org/3/cb2427en/cb2427en.pdfFAO. 2016. The State of Mediterranean and Black Sea Fisheries. General Fisheries Commission for the Mediterranean. Rome, Italy. https://www.fao.org/3/i5496e/i5496e.pdfFAO 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. https://www.fao.org/3/i4381b/i4381b.pdfGeneral Fisheries Commission for the Mediterranean (GFCM) Stock Assessment Results (STAR). https://www.fao.org/gfcm/data/star/en/ |
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