Descriptive and spatial analysis of bycatch in tuna purse-seine fishery in the colombian Pacific Ocean, with an elasmobranch approach
Bycatch species are as important as target species in the challenge of comprehensive fishery management. This is especially the case for vulnerable species such as elasmobranchs in offshore areas of the Colombian Pacific Ocean (CPO), for which information is scarce and long-term databases are used....
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Instituto Oceanográfico da Universidade de São Paulo
2024-08-01
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| Series: | Ocean and Coastal Research |
| Subjects: | |
| Online Access: | https://journals.usp.br/ocr/article/view/227919 |
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| Summary: | Bycatch species are as important as target species in the challenge of comprehensive fishery management. This is
especially the case for vulnerable species such as elasmobranchs in offshore areas of the Colombian Pacific Ocean
(CPO), for which information is scarce and long-term databases are used. Therefore, this study aimed to characterize
the bycatch in tuna purse-seine fishery with an elasmobranch species approach using fishery data from 2000 to
2019. A total of 59 bycatch species were identified, including 27 bony fishes, 22 elasmobranchs, two mollusks, four
sea turtles, and four dolphins. The total bycatch percentage was 20.8%, with elasmobranchs accounting for less than
5%. Fish aggregating devices (FADs) and class 6 vessels recorded the highest percentage of bycatch. Bony fish
bycatch was mainly obtained from the border of Ecuador until 4° N across the CPO. Elasmobranchs were captured
throughout the CPO, showing differences by vessel class and fishing method. The silky shark Carcharhinus falciformis
was the most caught species. Elasmobranch spatial abundance and capture hotspots showed the highest values
towards the northern coast, in offshore areas of Gorgona Island, southwards in offshore areas, and around Malpelo
Island. FADs captured the highest number of bycatch species compared with other fishing methods, such as Tuna
Associated with Dolphins (DEL), Natural Floating Objects (NAT), and Tuna not Associated (NoAs). Management
recommendations for bycatch species in this fishery are provided in the CPO.
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| ISSN: | 2675-2824 |