Vulnerability of elasmobranchs as longline bycatch in the gulf of Gabes (Southern Tunisia, central Mediterranean sea).
A survey of the bottom and pelagic longlines fisheries targeting groupers and swordfish was performed in the Gulf of Gabès in 2016 and 2017 in order to evaluate the elasmobranch catches. In the benthic longline fishery, the elasmobranchs represented about 50 % of the total catch (Batoids 25,6%, Sharks 24,5%) and the main species were the blackchin guitarfish (Glaucostegus cemiculus) and the hound sharks (Mustelus spp.). In the pelagic longline fishery, the elasmobranchs represented 91% of the total catches (Batoids 2,24%, Sharks 89,57%), and the main species was the sandbar shark (Carcharhinus plumbeus) with 82,5% of the total catch. The frequency distributions of TL showed that the catches of theses species were mostly composed of juveniles, and few mature specimens, including some gravid females.
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| Format: | Journal Contribution biblioteca |
| Language: | English |
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2018
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| Subjects: | Longline fisheries, Elasmobranchs, Juveniles, Gravid females, Palangre, |
| Online Access: | http://hdl.handle.net/1834/15135 |
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dig-aquadocs-1834-151352021-05-19T06:20:31Z Vulnerability of elasmobranchs as longline bycatch in the gulf of Gabes (Southern Tunisia, central Mediterranean sea). Enajjar, Samira Saïdi, Béchir Karaa, Sami Chouikhi, Khaled Bradai, M. Nejmeddine Longline fisheries Elasmobranchs Juveniles Gravid females Palangre A survey of the bottom and pelagic longlines fisheries targeting groupers and swordfish was performed in the Gulf of Gabès in 2016 and 2017 in order to evaluate the elasmobranch catches. In the benthic longline fishery, the elasmobranchs represented about 50 % of the total catch (Batoids 25,6%, Sharks 24,5%) and the main species were the blackchin guitarfish (Glaucostegus cemiculus) and the hound sharks (Mustelus spp.). In the pelagic longline fishery, the elasmobranchs represented 91% of the total catches (Batoids 2,24%, Sharks 89,57%), and the main species was the sandbar shark (Carcharhinus plumbeus) with 82,5% of the total catch. The frequency distributions of TL showed that the catches of theses species were mostly composed of juveniles, and few mature specimens, including some gravid females. Une étude des pêcheries de palangres de fond et de surface ciblant respectivement les mérous et l'espadon a été réalisée dans le golfe de Gabès en 2016 et 2017 afin d'évaluer les captures d'élasmobranches. Dans la pêcherie à la palangre benthique, les élasmobranches représentaient environ 50% des captures totales (batoïdes 25,6%, requins 24,5%). Les principales espèces étaient le poisson-guitare fouisseur (Glaucostegus cemiculus) et les émissoles (Mustelus spp.). Dans les palangriers pélagiques, les élasmobranches représentaient 91% des captures totales (batoïdes 2,24%, requins 89,57%), et l'espèce principale était le requin gris (Carcharhinus plumbeus) avec 82,5% des prises totales. Les distributions des fréquences des tailles ont montré que les captures de ces espèces étaient principalement composées de juvéniles. Quelques spécimens matures, y compris certaines femelles gravides sont aussi pêchées. Actes de la conférence méditerranéenne Biodiv 2017: La biodiversité : quelles orientations pour la recherche et quels outils de conservation? Monastir, Tunisie, 28 au 30 octobre 2017 Published 2019-04-30T08:19:39Z 2019-04-30T08:19:39Z 2018 Journal Contribution Refereed 0330-0080 http://hdl.handle.net/1834/15135 en http://www.instm.agrinet.tn pp.61-64 MED, Tunisia, Gulf of Gabes |
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Longline fisheries Elasmobranchs Juveniles Gravid females Palangre Longline fisheries Elasmobranchs Juveniles Gravid females Palangre |
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Longline fisheries Elasmobranchs Juveniles Gravid females Palangre Longline fisheries Elasmobranchs Juveniles Gravid females Palangre Enajjar, Samira Saïdi, Béchir Karaa, Sami Chouikhi, Khaled Bradai, M. Nejmeddine Vulnerability of elasmobranchs as longline bycatch in the gulf of Gabes (Southern Tunisia, central Mediterranean sea). |
| description |
A survey of the bottom and pelagic longlines fisheries targeting groupers and swordfish was performed in the Gulf of Gabès in 2016 and 2017 in order to evaluate the elasmobranch catches. In the benthic longline fishery, the elasmobranchs represented about 50 % of the total catch (Batoids 25,6%, Sharks 24,5%) and the main species were the blackchin guitarfish (Glaucostegus cemiculus) and the hound sharks (Mustelus spp.). In the pelagic longline fishery, the elasmobranchs represented 91% of the total catches (Batoids 2,24%, Sharks 89,57%), and the main species was the sandbar shark (Carcharhinus plumbeus) with 82,5% of the total catch.
The frequency distributions of TL showed that the catches of theses species were mostly composed of juveniles, and few mature specimens, including some gravid females. |
| format |
Journal Contribution |
| topic_facet |
Longline fisheries Elasmobranchs Juveniles Gravid females Palangre |
| author |
Enajjar, Samira Saïdi, Béchir Karaa, Sami Chouikhi, Khaled Bradai, M. Nejmeddine |
| author_facet |
Enajjar, Samira Saïdi, Béchir Karaa, Sami Chouikhi, Khaled Bradai, M. Nejmeddine |
| author_sort |
Enajjar, Samira |
| title |
Vulnerability of elasmobranchs as longline bycatch in the gulf of Gabes (Southern Tunisia, central Mediterranean sea). |
| title_short |
Vulnerability of elasmobranchs as longline bycatch in the gulf of Gabes (Southern Tunisia, central Mediterranean sea). |
| title_full |
Vulnerability of elasmobranchs as longline bycatch in the gulf of Gabes (Southern Tunisia, central Mediterranean sea). |
| title_fullStr |
Vulnerability of elasmobranchs as longline bycatch in the gulf of Gabes (Southern Tunisia, central Mediterranean sea). |
| title_full_unstemmed |
Vulnerability of elasmobranchs as longline bycatch in the gulf of Gabes (Southern Tunisia, central Mediterranean sea). |
| title_sort |
vulnerability of elasmobranchs as longline bycatch in the gulf of gabes (southern tunisia, central mediterranean sea). |
| publishDate |
2018 |
| url |
http://hdl.handle.net/1834/15135 |
| work_keys_str_mv |
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