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| Marine Resource Fact Sheet |
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| Red shrimp - Northern Spain, 2006 |
 | Aristeus antennatus - Northern Spain |
| | Owned by | General Fisheries Commission for the Mediterranean (GFCM)
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| Main Descriptors | Considered a single stock: Yes
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 Geo References  | | Distribution of Red shrimp - Northern Spain
| GFCM geographical sub-areas | 6: Northern Spain |
| | | | | | 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 - Northern Spain Resource Structure Considered a single stock: Yes Exploitation Spanish trawl fishery (1996–2006) in the Geographical Sub-Area 06 (Northern Spain)Throughout the time series landings fluctuated between 300 and 400 tonnes, decreasing below 300 t along the late 1990s. From 2002 landing recover the initial values over 300 tonnes. Females predominate in the landings nearly 80% of the total.
Discards of the red shrimp are null. The number of harbours with red shrimp fleets is 14 for the whole area. The estimated effort figures was made based on daily vessels sale sheets information obtained through the National Sampling Programme available for the Santa Pola fleet. The CPUEs fluctuated around long-term average of 30 Kg/day. Effort data indices Landings/CPUE) remain fairly stable. Information on Operational Units exploiting this resource will be soon available at the following link: GSA 06 Red Shrimp (Aristeus antennatus)Assessment Assessment Model Type: Age-structured VPA Separable, Extended Survivor Analysis (XSA) The state of exploitation was assessed for the period 1992-2006 by means of a VPA Separable, tuned with standardised CPUE from commercial fleet and abundance indices from MEDITS trawl survey. Analysis was carried out applying the Extended Survivor Analysis (XSA) method (Lowestoft suite; Darby and Flatman, 1994; Fisheries Library in R) over the period 1992-2006. Assessment Model Type: Size-structured Yield-per-recruit (Y/R) In addiction, a yield-per-recruit (Y/R) analysis (VIT program; Lleonart and Salat, 1992) was applied on the mean pseudo-cohort 1992-2006 for the GFCM geographical sub-area Northern Spain (GSA-06). Data Both methods were performed from size composition of trawl catches (obtained from on board and on port monthly sampling) and official landings transforming length data to age data by slicing (L2AGE program). Overall Assessment Results Total biomass of the stock has fluctuated around 800 t, in a similar way as SSB does around 500 t. The SSB-R relationship also shows a decreasing trend, with some stability around the Rmax (40*10^9 ind.) with recruitments showing a slight tendency to increase. Abundance indices show a slight recovery on 2006. Forecast at status quo shows no changes in SSB and yields, indicating a recruitment dependency. The resource was considered over exploited, with some indications of growth overexploitation, and with B and SSB below the mean values. By comparing to previous assessments, a new set of growth parameters has been used. Scientific Advice For management considerationsIt is compulsory not to increase the fishing effort from the level reported in the assessment forms (8942 fishing days for a fleet of 130 vessels) being recommended a reduction of 10% to recover SSB of red shrimp (Aristeus antennatus) exploited by the Spanish trawl fishery (1996–2006) in GSA 06. Considering that a substantial part of the catches are immature individuals an improvement of the selectivity (use of 40mm square mesh) could be efficient. Management Management Advice Scientific advices for management consideration formulated by SCSA have been adopted by SAC. Advices and comments by SAC
- reduction of 10 percent of the current fishing effort (8942 fishing days for a fleet of 130 vessels) to recover SSB;
- the 40mm square mesh should be implemented
Comment: Fine tune analysis to facilitate decision making Biological State and Trend Exploitation state: OverexploitedExploitation rate: High fishing mortality
Abundance level: Low abundance The fishery is being exploited at above a level which is believed to be sustainable in the long term, with no potential room for further expansion and a higher risk of stock depletion/collapse. Source of information “Stock assessment of red shrimp (Aristeus antennatus) exploited by the Spanish trawl fishery (1996–2006) in the Geographical Sub-Area 06 (Northern Spain). In: REPORT OF THE NINTH SESSION OF THE SUB-COMMITTEE ON STOCK ASSESSMENT (SCSA)” . A. Carbonell J. L. Pérez Gil, A. Fernández, A. Esteban, M. García-Rodríguez. FAO-GFCM Kavala, Greece, 17–20 September 2007 2007 FAO  . “Report of the tenth session of the SCIENTIFIC ADVISORY COMMITTEE” FAO-GFCM Nicosia, Cyprus, 22–26 October 2007 2007 FAO . |
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