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| Marine Resource Fact Sheet |
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| Surmullet - Balearic Islands, 2008 |
 | Mullus surmuletus - Balearic Islands |
| | 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: Hard bottom. Depth zone: Shelf 50 200m. Horizontal distribution: Neritic; Littoral. Vertical distribution: Demersal/Benthic. Geographical Distribution Jurisdictional distribution: Straddling between High Seas and EEZ Water Area Overview Spatial Scale: Sub-Regional MallorcaGeo References  | | Distribution of Surmullet - 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 Surmullet - Balearic Islands Resource Structure Considered a single stock: Yes Exploitation Striped red mullet ( Mullus surmuletus) is one of the most important target species in the trawl fishery developed by around 40 vessels off Mallorca (Balearic Islands, GFCM-GSA05). A fraction of the small-scale fleet (~100 boats) also directs to this species during the second semester of the year, using both trammel nets and gillnets. During the last decade, the annual landings of this species have oscillated between 73-117 and 17-29 tons in the trawl and small-scale fishery, respectively. Information on Operational Units exploiting this resource will be soon available at the following link: GSA 05 Striped red mullet (Mullus surmuletus)Assessment Data The stock of Mullus surmuletus of the GFCM-GSA05 has been assessed using data from both the trawl and the small-scale fishery on a time series covering nine years (2000-2008). Assessment Model Virtual population analysis (VPA), Extended survivors analysis (XSA), Yield per recruit analysis (Y/R) The assessment has been carried out applying tuned VPA (Extended Survivor Analysis, XSA) on the cohorts present during 2000-2008 and both VPA and Y/R analysis on a mean pseudo-cohort from that period. These approaches were performed using monthly size composition of catches, official landings and the biological parameters estimated within the framework of the Data Collection Programme (2003-2004). The VPA was tuned with CPUE from commercial trawl fleet (2000-2008) and bottom trawl surveys (2001–2008). The vector of natural mortality by age was calculated from Caddy´s (1991) formula, using the PROBIOM Excel spreadsheet (Abella et al., 1997). The software used were the Lowestoft VPA program (Darby and Flatman, 1994) for the XSA and the VIT program (Lleonart and Salat, 1992) for the VPA and Y/R analysis from a mean pseudo-cohort. Scientific Advice For management considerationsNo increase the fishing effort. Management Management Advice Advices and comments by SACScientific advices for management consideration formulated by SCSA have been adopted by SAC. Biological State and Trend Exploitation state: Fully exploitedExploitation rate: Moderate fishing mortality
Abundance level: Intermediate abundance Current Y/R very close to the maximum and Bnow being 37.3 Bvirgin. Source of information “Stock assessment of hake (Merluccius merluccius) from the trawl fishery GSA 05 (Balearic Islands). In: Report of the 11th session of the Sub-Commitee on Stock Assessment (SCSA)” . Quetglas A., Guijarro B., Ordines F., Moranta J. FAO-GFCM Malaga, Spain, 30 November - 3 December 2009 2009 FAO  . “General Fisheries Commission for the Mediterranean. Thirthy-fourth Session. Management of Mediterranean Fisheries.” FAO-GFCM Athens, Greece, 14-17 April 2010 2010 FAO  . |
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