Incidental capture of sea turtles by longlines in the Gulf of Gabès (South Tunisia): A comparative study between bottom and surface longlines
Longlines are a fishing gear that have traditionally been used world-wide. Surface longlines are mainly used to fish swordfish, albacore, tuna and some species of sharks, while bottom longlines are used to fish large bottom-dwelling fish such as groupers. Longlines are widely known to interact with...
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| Format: | Article |
| Language: | English |
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Consejo Superior de Investigaciones Científicas
2008-06-01
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| Series: | Scientia Marina |
| Subjects: | |
| Online Access: | http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/830 |
| _version_ | 1818667707229274112 |
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| author | Imed Jribi Khaled Echwikhi Mohamed Nejmeddine Bradai Abderrhmen Bouain |
| author_facet | Imed Jribi Khaled Echwikhi Mohamed Nejmeddine Bradai Abderrhmen Bouain |
| author_sort | Imed Jribi |
| collection | DOAJ |
| description | Longlines are a fishing gear that have traditionally been used world-wide. Surface longlines are mainly used to fish swordfish, albacore, tuna and some species of sharks, while bottom longlines are used to fish large bottom-dwelling fish such as groupers. Longlines are widely known to interact with several species of sea turtles, and there is increasing concern about the impact of by-catch on these species. However, there is a paucity of data on sea turtle interactions with bottom longlines. In this paper we analyse the interaction of sea turtles with both bottom and surface longlines in the zone of Zarzis in the south of the gulf of Gabès, which is considered to be an important Mediterranean wintering and foraging area for the loggerhead turtle, Caretta caretta. Results show an important interaction with both types of longlines. Catch rates were estimated to be 0.823 per 1000 hooks for surface longline and 0.278 per 1000 hooks for bottom longline. Direct mortalities were estimated to be 0% (n=33 captures) and 12.5% (n=24 captures), respectively. |
| first_indexed | 2024-12-17T06:24:42Z |
| format | Article |
| id | doaj.art-07a3dd988d21492d8df2f10ef3f4859d |
| institution | Directory Open Access Journal |
| issn | 0214-8358 1886-8134 |
| language | English |
| last_indexed | 2024-12-17T06:24:42Z |
| publishDate | 2008-06-01 |
| publisher | Consejo Superior de Investigaciones Científicas |
| record_format | Article |
| series | Scientia Marina |
| spelling | doaj.art-07a3dd988d21492d8df2f10ef3f4859d2022-12-21T22:00:20ZengConsejo Superior de Investigaciones CientíficasScientia Marina0214-83581886-81342008-06-0172233734210.3989/scimar.2008.72n2337822Incidental capture of sea turtles by longlines in the Gulf of Gabès (South Tunisia): A comparative study between bottom and surface longlinesImed Jribi0Khaled Echwikhi1Mohamed Nejmeddine Bradai2Abderrhmen Bouain3Sfax Faculty of SciencesSfax Faculty of SciencesNational Institute of Sea Sciences and TechnologiesSfax Faculty of SciencesLonglines are a fishing gear that have traditionally been used world-wide. Surface longlines are mainly used to fish swordfish, albacore, tuna and some species of sharks, while bottom longlines are used to fish large bottom-dwelling fish such as groupers. Longlines are widely known to interact with several species of sea turtles, and there is increasing concern about the impact of by-catch on these species. However, there is a paucity of data on sea turtle interactions with bottom longlines. In this paper we analyse the interaction of sea turtles with both bottom and surface longlines in the zone of Zarzis in the south of the gulf of Gabès, which is considered to be an important Mediterranean wintering and foraging area for the loggerhead turtle, Caretta caretta. Results show an important interaction with both types of longlines. Catch rates were estimated to be 0.823 per 1000 hooks for surface longline and 0.278 per 1000 hooks for bottom longline. Direct mortalities were estimated to be 0% (n=33 captures) and 12.5% (n=24 captures), respectively.http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/830longlineby-catchcatch ratecaretta carettamortalitygabès gulfmediterranean |
| spellingShingle | Imed Jribi Khaled Echwikhi Mohamed Nejmeddine Bradai Abderrhmen Bouain Incidental capture of sea turtles by longlines in the Gulf of Gabès (South Tunisia): A comparative study between bottom and surface longlines Scientia Marina longline by-catch catch rate caretta caretta mortality gabès gulf mediterranean |
| title | Incidental capture of sea turtles by longlines in the Gulf of Gabès (South Tunisia): A comparative study between bottom and surface longlines |
| title_full | Incidental capture of sea turtles by longlines in the Gulf of Gabès (South Tunisia): A comparative study between bottom and surface longlines |
| title_fullStr | Incidental capture of sea turtles by longlines in the Gulf of Gabès (South Tunisia): A comparative study between bottom and surface longlines |
| title_full_unstemmed | Incidental capture of sea turtles by longlines in the Gulf of Gabès (South Tunisia): A comparative study between bottom and surface longlines |
| title_short | Incidental capture of sea turtles by longlines in the Gulf of Gabès (South Tunisia): A comparative study between bottom and surface longlines |
| title_sort | incidental capture of sea turtles by longlines in the gulf of gabes south tunisia a comparative study between bottom and surface longlines |
| topic | longline by-catch catch rate caretta caretta mortality gabès gulf mediterranean |
| url | http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/830 |
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