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| Marine Resource 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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| Related observations | Locate in inventory | | | | Species: | | FAO Names: en - Common dentex, fr - Denté commun, es - Dentón, ru - Зубан обыкновенный |
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| Geographic extent of Common dentex - Northern Tunisia, Gulf of Hammamet
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| GFCM geographical sub-areas |
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| 12 | Northern Tunisia |
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| Main Descriptors | Considered a single stock: No
Spatial Scale: Sub-Regional
Reference year: 2006 |
| 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. |
| Reference Year: The Reference Year is the last year considered in the stock assessment and/or fishery status. |
| | | | | | Biological State and 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 and Biology Climatic zone: Temperate. Bottom type: Hard bottom. Depth zone: Shelf (50 m - 200 m). Horizontal distribution: Neritic. Vertical distribution: Demersal/Benthic. Geographical Distribution Jurisdictional distribution: National Water Area Overview Spatial Scale: Sub-Regional Geo References  | | Geographic extent of Common dentex - Northern Tunisia, Gulf of Hammamet
| GFCM geographical sub-areas | 12: Northern Tunisia |
| | | | | | More Geo References
| FAO Fishing Statistical Division Areas | 37.1.3: Sardinia |
| | | | | | Intersecting Major FAO areas and LME areas |
The following area codes have been found as intersecting the distribution of Common dentex - Northern Tunisia, Gulf of Hammamet Resource Structure Considered a single stock: No Exploitation Dentex dentex is exploited on the Tunisian coasts by artisanal gears especially, the trammel nets and long-lines. Assessment 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. Assessment Model 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. Overall Assessment 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. Scientific 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 is
recommended 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 Management Advice Scientific advices for management consideration formulated by SCSA have been adopted by SAC. Source of information “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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