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| Marine Resource Fact Sheet |
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| Red shrimp - Balearic Islands, 2010 |
 | Aristeus antennatus - Balearic Islands |
| | Owned by | General Fisheries Commission for the Mediterranean (GFCM) More |
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| Related observations | Locate in inventory | | | | Species: | | FAO Names : en - Blue and red shrimp, fr - Crevette rouge, es - Gamba rosada |
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| Geographic extent of Red shrimp - Balearic Islands
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 | GFCM geographical sub-areas |
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| 5 | Balearic Islands |
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| Main Descriptors | Considered a single stock: Biological Stock
Spatial Scale: Sub-Regional
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| Considered a single stock: A group of individuals in a species occupying a well defined spatial range independent of other stocks of the same species. It can be affected by random dispersal movements and directed migrations due to seasonal or reproductive activity. |
| Spatial Scale: Spatial scale contains a standard term such as Global, Regional (e.g. for the whole Atlantic), sub-regional (e.g. for a part of the Atlantic), national, local (for sub-national levels). |
| 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. |
| | | | | | Habitat and Biology Climatic zone: Temperate. Bottom type: Soft bottom. Depth zone: Slope 200 1000m. Horizontal distribution: Neritic. Vertical distribution: Demersal/Benthic. Geographical Distribution Jurisdictional distribution: Straddling between High Seas and EEZ Water Area Overview Spatial Scale: Sub-Regional Balearic IslandsGeo References | | Geographic extent of Red shrimp - Balearic Islands
| GFCM geographical sub-areas | 5: Balearic Islands |
| | | | | | Other georeferences
| FAO Fishing Statistical Division Areas | 37.1.1: Balearic |
| | | | | | Intersecting Major FAO areas and LME areas |
The following area codes have been found as intersecting the distribution of Red shrimp - Balearic Islands Resource Structure Considered a single stock: Aq Res Struct Exploitation The number of vessels was reduced from the initial census in 1992, which for the deep water shrimp fishery fleet was estimated in 49 trawl vessels, while the Fishing fleet census in 2008 was 34 trawl vessels, for the whole GSA05 area. Annual landings in the Mallorca Island in the nineties (1992-1999) were around 200 tonnes and were produced by a total effort of between 3500-4400 fishing days*vessel (number of days*vessel ). From 2000 year landing arise around 150 tonnes and total effort between 3200-4200 fishing days, with a mean value of 3900 trips at year. Bottom trawl fleet fishing effort of the Majorca Island was quite stable for the period studied. Around 35 vessels operated in the area, whose lengths are between 12- 24 m. The cod end mesh size used was a diamond 40 mm of mesh opening until Jun 1st 2010, when (following EC Regulation) it was changed to a square 40 mm of mesh opening or (by derogation) to a 50 mm diamond mesh. Up to 60% of the trawl fleet in the Balearic Islands operates in the middle slope. Assessment Data LFDs (length frequency distributions) between 1992-2010 were used. Other data series, such as landings (1978-2010), cpues (catch per unit effort: Kg/day~trip, 1992-2010) and fishing effort (in days) were also used. Assessment Model Type: Age-structured Extended survivors analysis (XSA) Methodology The Separable VPA (virtual population analysis) and XSA were made for the Annual Catch at Age for females and males summed to obtain the final sex combined matrix. The LCA (Length cohort analysis) based on pseudocohort was made for the average carapace length (CL mm) size distribution for the years 2005-2010, for females, males and total. Separable VPA and XSA was performed by the software provided by Darby and Flatman (1994). Results PopulationThe Spawning Stock Biomass and Recruitment estimates for 2010 resulted as 388 t and 29.79 t, respectively. Fishing mortality ratesF mortalities resulted as: F 1= 0.586, F 2= 1.36 Assessment Model Type: Others Yield per Recruit (Y/R) Methodology Pseudocohort analysis and Y/R was done using VIT (Lleonart and Salat, 1997). Results 2005-2010: (F as factors) F max = 0.41, F 0.1 = 0.25, Y/R = 7.104 g, Y/R 0.1= 7.772 g Scientific Advice For management considerationSince the mean size and landings appear close to the mean values for the whole time series, the monitoring of the fishery should continue carefully looking for the progress of the fishery. A decrease in F could be provided using complementary management measures like temporal fishing time reduction for some periods like at the beginning of the reproduction or spawning period and during the recruitment period at the beginning of autumn. Biological State and Trend Exploitation state: OverexploitedExploitation rate: Moderate fishing mortality
Abundance level: Low abundance The stock is in overfishing status. Stock abundance and biomass and recruitment showed oscillations for the entire data series, without any clear trend. Source of information Report of the Working Group on Stock Assessment of Demersal Species. FAO-GFCM Chania, Crete (Greece) 24-29 October 2011. 2011 FAO  . |
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