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Fact Sheet Title Fact Sheet |
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Common dentex - Northern Tunisia, Gulf of Hammamet |
Dentex dentex - Northern Tunisia, Gulf of Hammamet, Gulf of Gabes |
| 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 - Common dentex, fr - Denté commun, es - Dentón, ru - Зубан обыкновенный |
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| ident Block Common dentex - Northern Tunisia, Gulf of Hammamet Map tips - Click on to turn layers on and off
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gfcm Sub Area |
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12 | Northern Tunisia |
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Aq Res | Biological Stock: No Value: Sub-Regional Reference year: 2006 |
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 the North (GSA 12), the yield by recruit value is below the optimal level; the stock seems to be under-exploited. The exploitation profile in the eastern region (GSA 13) is in optimal conditions. Habitat Bio Climatic Zone: Temperate. Bottom Type: Hard bottom. Depth Zone: Shelf (50 m - 200 m). Horizontal Dist: Neritic. Vertical Dist: Demersal/Benthic. Geo Dist Geo Dist: National Water Area Overview Spatial Scale: Sub-Regional Water Area Overview | Water Area Overview Common dentex - Northern Tunisia, Gulf of Hammamet
gfcm Sub Area | 12: Northern Tunisia |
| | | | Water Area Overview
| | | | Water Area Overview |
Water Area OverviewCommon dentex - Northern Tunisia, Gulf of Hammamet Aq Res Struct Biological Stock: No Exploit Dentex dentex is exploited on the Tunisian coasts by artisanal gears especially, the trammel nets and long-lines. Bio Assess Data Two stocks are separately dealt according to two different regions: the Northern and the Eastern coasts. In total, 1538 individuals are sampled from January 2004 to December 2004, along the Tunisian coasts. The total length of the monthly sampled fish are ranged by size classes of one centimeter and the size structure is pondered to the respective monthly landings, then extrapolated to the yearly captures. Assess Models Type: Size-structured Length cohort analysis (LCA) Data Natural mortality index (M= 0.18) was obtained from the mean value estimated by Pauly (1980) and Djabali & al. (1994). Chosen fishing effort values (Ft) were 1.3 and 1.2 respectively for the Northern and the Eastern regions. Results In the North, the yield by recruit values is below the optimal level; the stock seems to be under-exploited. In the aim to improve the exploitation, the actual effort by catch would be duplicated. Nevertheless, the exploitation profile in the eastern region is in optimal conditions. Sci Advice For management considerations - The actual conditions of fishing should be maintained. However, Dentex dentex is considered as a target species and captured by selective longlines, all tentative to increase the actual fishing effort would permit to improve in short term or in long term the captures along Northern and Eastern coasts.
- A more detailed description of the fishery should be provided to facilitate the management advice.
- As a precautionary measure isrecommended not to increase the fishing effort in both areas
- SCSA endorsed the WG management advice and recommendations on Dentex dentex from Tunisian coasts (GSA 12, 13)
Management Advice Scientific advices for management consideration formulated by SCSA have been adopted by SAC. Sources “Stock assessment of common dentex (Dentex dentex) in the Geographical Sub-Areas 12, 13 (Northern Tunisia, Gulf of Hammamet). In: Report of 9th Meeting of the Sub-Committee on Stock Assessment (SCSA), Working Group on Demersals” . Bachra Chemmam-Abdelkader, Soufia Ezzeddine, Med. Mejdeddine Kraiem FAO-GFCM Athens, Greece, 10-12 September, 2007 FAO http://www.icm.csic.es/rec/projectes/scsa/Demersals_2007/WGD_2007.pdf “Report of the tenth session of the SCIENTIFIC ADVISORY COMMITTEE” FAO-GFCM Nicosia, Cyprus, 22–26 October 2007 2007 FAO http://www.fao.org/tempref/docrep/fao/010/a1579b/a1579b00.pdf |
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