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Fact Sheet Title Fact Sheet |
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Red mullet - Northern Tunisia, Gulf of Hammamet, Gulf of Gabes |
Mullus barbatus - Northern Tunisia, Gulf of Hammamet, Gulf of Gabes (GSAs 12-14) |
| 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 - Red mullet, fr - Rouget de vase, es - Salmonete de fango, ru - Султанка обыкновенная (=барабулька) |
Fishery IndicatorsProduction: Landed Volume |
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gfcm Sub Area |
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12 | Northern Tunisia |
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13 | Gulf of Hammamet |
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14 | Gulf of Gabes |
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Aq Res | Biological Stock: No 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. |
Reference Year: The Reference Year is the last year considered in the stock assessment and/or fishery status. |
| | | | 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: Shelf (50 m - 200 m). Horizontal Dist: Neritic; Littoral. Vertical Dist: Demersal/Benthic. Water Area Overview Spatial Scale: Sub-Regional Water Area Overview | Water Area Overview Red mullet - Northern Tunisia, Gulf of Hammamet, Gulf of Gabes
gfcm Sub Area | 12: Northern Tunisia | 13: Gulf of Hammamet | 14: Gulf of Gabes |
| | | | Water Area Overview
fao Div | 37.1.3: Sardinia | 37.2.2: Ionian |
| | | | Water Area Overview |
Water Area OverviewRed mullet - Northern Tunisia, Gulf of Hammamet, Gulf of Gabes 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 The red mullet is an important demersal species for commercial fisheries in GSAs 12-14. It is exploited by the trawl and small-scale fleet. Small gear (trammel nets and gillnets) account for 5 percent of the total landings of red mullet (average for the 2010-2019 period). Trawl fleet accounts for 2 707 tonnes (average for the 2010-2019 period). Trawl fishery exploits a highly diversified species assemblage, the main commercial species being the caramote prawn (Penaeus kerathurus), striped red mullet, European hake, sparid fish, common pandora (Pagellus erythrinus), annular sea bream (Diplodus annularis), gilthead sea bream (Sparus auratus). Catch lengths of red mullet range between 8 cm and 26 cm total length, with an average size of 14 cm total length. Fishery Indicators Type | Measure | Value | Unit | Time period |
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Production | Landed Volume | 3 420.58 | tonnes | 2010 | Landed Volume | 2 700.43 | tonnes | 2011 | Landed Volume | 2 644.94 | tonnes | 2012 | Landed Volume | 2 357.54 | tonnes | 2013 | Landed Volume | 2 909.71 | tonnes | 2014 | Landed Volume | 2 929.49 | tonnes | 2015 | Landed Volume | 2 169.91 | tonnes | 2016 | Landed Volume | 2 347.82 | tonnes | 2017 | Landed Volume | 3 036.55 | tonnes | 2018 | Landed Volume | 2 551.6 | tonnes | 2019 |
Bio Assess Data Stock assessment of red mullet was carried out using the official Tunisian catch data of bottom trawling in GSAs 12-14. Number-at-age data from experimental trawl surveys carried out in the considered GSAs were used as tuning data. The vector of natural mortality by age was calculated using the Gislason model. The biological parameters used were: L∞ = 25.96, k = 0.309, t0 = 0.824, a =0.0044, b = 3.29 for combined sexes. Maturity by age data was estimated using the maturity ogive parameters of red mullet female. Assess Models Type: Age-structured XSA The assessment was performed using XSA as implemented in the FLR. Model settings in terms of shrinkages and catchability of the best benchmark model (2018 GFCM benchmark session for the assessment of red mullet in GSAs 12-16 and 19) were assumed. According to the recommendations of the WG, current F was obtained as the average of three previous years (2017-2019). Results According to the recommendations of the WG, F(current) was estimated as the average of the last three years of the time series considered (2017-2019) and equal to 1.32; F0.1 was estimated using FLR routine. Sci Advice Reduce fishing mortality; STF available. 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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