Mitigating effects on target and by-catch species fished by drifting longlines using circle hooks in the South Adriatic Sea (Central Mediterranean)
IntroductionLongline fishing gear has a higher by-catch rate than any other type of commercial fishing gear. Nowadays, there is an urgent need to find efficient management strategies to mitigate by-catch and the use of new hook types could be one of them. This study investigates the effects of a lon...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-03-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2023.1124093/full |
| _version_ | 1811160715241717760 |
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| author | Pierluigi Carbonara Giulia Prato Simone Niedermüller Sébastien Alfonso Cosmidano Neglia Marilena Donnaloia Giuseppe Lembo Maria Teresa Spedicato |
| author_facet | Pierluigi Carbonara Giulia Prato Simone Niedermüller Sébastien Alfonso Cosmidano Neglia Marilena Donnaloia Giuseppe Lembo Maria Teresa Spedicato |
| author_sort | Pierluigi Carbonara |
| collection | DOAJ |
| description | IntroductionLongline fishing gear has a higher by-catch rate than any other type of commercial fishing gear. Nowadays, there is an urgent need to find efficient management strategies to mitigate by-catch and the use of new hook types could be one of them. This study investigates the effects of a longline fishery (which targets swordfish, Xiphias gladius, in the South Adriatic Sea) replacing the traditional J-type hook with a circle hook (C-type hook) on target and by-catch species.MethodsFor this purpose, a fishing trip of nine days – with seven fishing sets – was monitored. For both targeted swordfish and by-catch specimens caught (i.e., blue shark, Prionace glauca; pelagic stingray, Pteroplatytrygon violacea; and loggerhead turtle, Caretta caretta), data about the hook type used (J-type vs. C-type), the specimen size, and their capture condition were collected.Results and discussionWith all species, we observed no significant difference in catch-per-unit-effort (CPUE) or specimen lengths between the two hook types. In addition, the hook type did not significantly affect the capture condition of swordfish, pelagic stingray, or loggerhead turtle specimens; however, it significantly affected the capture condition of blue sharks. The percentage of blue shark specimens found in healthy condition was higher when using a C-type hook (71.5%) than when using a J-type hook (22.6%). Overall, these preliminary results suggest that the use of a C-type hook improves the condition of by-caught blue sharks without affecting the CPUE or size of the target species. In conclusion, the use of a C-type hook could reduce the detrimental effects of by-catch on some species in the Adriatic Sea; however, this finding needs to be confirmed by a study with a larger sample size. |
| first_indexed | 2024-04-10T06:03:11Z |
| format | Article |
| id | doaj.art-d01151a4f77a4bfe8b49f6b0e4ea7a1e |
| institution | Directory Open Access Journal |
| issn | 2296-7745 |
| language | English |
| last_indexed | 2024-04-10T06:03:11Z |
| publishDate | 2023-03-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj.art-d01151a4f77a4bfe8b49f6b0e4ea7a1e2023-03-03T06:41:55ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452023-03-011010.3389/fmars.2023.11240931124093Mitigating effects on target and by-catch species fished by drifting longlines using circle hooks in the South Adriatic Sea (Central Mediterranean)Pierluigi Carbonara0Giulia Prato1Simone Niedermüller2Sébastien Alfonso3Cosmidano Neglia4Marilena Donnaloia5Giuseppe Lembo6Maria Teresa Spedicato7Fondazione COISPA ETS, Bari, ItalyWorld Wide Fund for Nature (Italia), Rome, ItalyWorld Wide Fund for Nature - Mediterranean Marine Initiative, Rome, ItalyFondazione COISPA ETS, Bari, ItalyFondazione COISPA ETS, Bari, ItalyFondazione COISPA ETS, Bari, ItalyFondazione COISPA ETS, Bari, ItalyFondazione COISPA ETS, Bari, ItalyIntroductionLongline fishing gear has a higher by-catch rate than any other type of commercial fishing gear. Nowadays, there is an urgent need to find efficient management strategies to mitigate by-catch and the use of new hook types could be one of them. This study investigates the effects of a longline fishery (which targets swordfish, Xiphias gladius, in the South Adriatic Sea) replacing the traditional J-type hook with a circle hook (C-type hook) on target and by-catch species.MethodsFor this purpose, a fishing trip of nine days – with seven fishing sets – was monitored. For both targeted swordfish and by-catch specimens caught (i.e., blue shark, Prionace glauca; pelagic stingray, Pteroplatytrygon violacea; and loggerhead turtle, Caretta caretta), data about the hook type used (J-type vs. C-type), the specimen size, and their capture condition were collected.Results and discussionWith all species, we observed no significant difference in catch-per-unit-effort (CPUE) or specimen lengths between the two hook types. In addition, the hook type did not significantly affect the capture condition of swordfish, pelagic stingray, or loggerhead turtle specimens; however, it significantly affected the capture condition of blue sharks. The percentage of blue shark specimens found in healthy condition was higher when using a C-type hook (71.5%) than when using a J-type hook (22.6%). Overall, these preliminary results suggest that the use of a C-type hook improves the condition of by-caught blue sharks without affecting the CPUE or size of the target species. In conclusion, the use of a C-type hook could reduce the detrimental effects of by-catch on some species in the Adriatic Sea; however, this finding needs to be confirmed by a study with a larger sample size.https://www.frontiersin.org/articles/10.3389/fmars.2023.1124093/fullblue sharkcircle hookloggerhead turtlepelagic longlinespelagic stingrayswordfish |
| spellingShingle | Pierluigi Carbonara Giulia Prato Simone Niedermüller Sébastien Alfonso Cosmidano Neglia Marilena Donnaloia Giuseppe Lembo Maria Teresa Spedicato Mitigating effects on target and by-catch species fished by drifting longlines using circle hooks in the South Adriatic Sea (Central Mediterranean) Frontiers in Marine Science blue shark circle hook loggerhead turtle pelagic longlines pelagic stingray swordfish |
| title | Mitigating effects on target and by-catch species fished by drifting longlines using circle hooks in the South Adriatic Sea (Central Mediterranean) |
| title_full | Mitigating effects on target and by-catch species fished by drifting longlines using circle hooks in the South Adriatic Sea (Central Mediterranean) |
| title_fullStr | Mitigating effects on target and by-catch species fished by drifting longlines using circle hooks in the South Adriatic Sea (Central Mediterranean) |
| title_full_unstemmed | Mitigating effects on target and by-catch species fished by drifting longlines using circle hooks in the South Adriatic Sea (Central Mediterranean) |
| title_short | Mitigating effects on target and by-catch species fished by drifting longlines using circle hooks in the South Adriatic Sea (Central Mediterranean) |
| title_sort | mitigating effects on target and by catch species fished by drifting longlines using circle hooks in the south adriatic sea central mediterranean |
| topic | blue shark circle hook loggerhead turtle pelagic longlines pelagic stingray swordfish |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2023.1124093/full |
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