Reconstructing historical catch trends of threatened sharks and rays based on fisher ecological knowledge.
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| Title: | Reconstructing historical catch trends of threatened sharks and rays based on fisher ecological knowledge. |
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| Authors: | Leurs G; Conservation Ecology Group, Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands.; Marine Animal Ecology Group, Wageningen University & Research, Wageningen, The Netherlands., Jabado RW; Elasmo Project, Dubai, UAE.; College of Science and Engineering, James Cook University, Townsville, Australia., Camará A; Instituto Nacional de Investigação das Pescas e Oceanografia (INIPO), Bissau, Guinea-Bissau.; Marine and Environmental Sciences Centre (MARE)/Aquatic Research Network (ARNET), ISPA Instituto Universitário, Lisbon, Portugal., Dos Santos L; ISCTE University Institute of Lisbon, Lisbon, Portugal., Nonque DM; Instituto Nacional de Investigação das Pescas e Oceanografia (INIPO), Bissau, Guinea-Bissau.; University of the Azores, Ponta Delgada, Portugal., Zuidewind TJ; Conservation Ecology Group, Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands., Barry I; Instituto Nacional de Investigação das Pescas e Oceanografia (INIPO), Bissau, Guinea-Bissau., Campredon P; Instituto da Biodiversidade e das Áreas Protegidas (IBAP), Bissau, Guinea-Bissau., Blaschke B; Conservation Ecology Group, Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands., de Boer K; Conservation Ecology Group, Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands.; Beta Science Shop, Faculty of Science and Engineering, University of Groningen, Groningen, The Netherlands., Hijner N; Conservation Ecology Group, Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands., Olff H; Conservation Ecology Group, Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands., Pontes SL; Instituto da Biodiversidade e das Áreas Protegidas (IBAP), Bissau, Guinea-Bissau., Regalla A; Instituto da Biodiversidade e das Áreas Protegidas (IBAP), Bissau, Guinea-Bissau., Walsh MB; Food and Agriculture Organization of the United Nations (FAO), Rome, Italy., Govers LL; Conservation Ecology Group, Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands.; Department of Coastal Systems, Royal Netherlands, Institute for Sea Research (NIOZ), Den Burg, The Netherlands. |
| Source: | Conservation biology : the journal of the Society for Conservation Biology [Conserv Biol] 2025 Oct; Vol. 39 (5), pp. e70059. Date of Electronic Publication: 2025 May 31. |
| Publication Type: | Journal Article |
| Language: | English |
| Journal Info: | Publisher: Blackwell Publishing, Inc. on behalf of the Society for Conservation Biology Country of Publication: United States NLM ID: 9882301 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1523-1739 (Electronic) Linking ISSN: 08888892 NLM ISO Abbreviation: Conserv Biol Subsets: MEDLINE |
| Imprint Name(s): | Publication: Malden, MA : Blackwell Publishing, Inc. on behalf of the Society for Conservation Biology Original Publication: Boston, Mass. : Blackwell Scientific Publications, |
| MeSH Terms: | Sharks*/physiology , Skates, Fish*/physiology , Fisheries*/statistics & numerical data , Conservation of Natural Resources*/methods , Endangered Species*, Animals |
| Abstract: | Small-scale fisheries often lack historical shark and ray catch information, hampering their management. We reconstructed historical catch trends and current fishing pressure by combining local ecological knowledge, satellite-based vessel counts, and a short-term landing-site survey. To test the effectiveness of this method, we focused on the Bijagós Archipelago (Guinea-Bissau, West Africa), where historical fisheries data are lacking. Benthic rays (stingrays [Dasyatidae] and butterfly rays [Gymnura spp.]), benthopelagic rays (duckbill eagle rays [Aetomylaeus bovinus] and cownose rays [Rhinoptera marginata]), guitarfish (Glaucostegus and Rhinobatos spp.), requiem sharks (Carcharhinidae), and hammerhead sharks (Sphyrna spp.) declined in abundance by 81.5-96.7% (species dependent) from 1960 to 2020. Fishing effort increased annually: fishing trip duration by 42.0% (SE 3.4), numbers of fishing vessels at sea as perceived by fishers by 36.3% (1.0) (1960-2020), and number of vessels by 12.0% (1.1) (2007-2022). We estimated that in 2020, fishing vessels collectively captured 61-264 sharks and 522-2194 rays per day in the archipelago, depending on the proportion of the fishing fleet that was active (i.e., low fleet activity of 18% and high fleet activity of 80%). We advocate for reducing shark and ray catches by regulating fleet size, reinforcing boundaries of protected areas, and collecting fisher-dependent information on shark and ray landings to safeguard these vulnerable species and coastal livelihoods. We demonstrated the effectiveness of using this 3-pronged approach to provide baseline data on shark fisheries, a common challenge in areas with small-scale fisheries and limited research capacity. (© 2025 The Author(s). Conservation Biology published by Wiley Periodicals LLC on behalf of Society for Conservation Biology.) |
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| Grant Information: | NWO016.VENI.181.087 Exacte en Natuurwetenschappen; Shark Conservation Fund; MAVA Foundation |
| Contributed Indexing: | Keywords: Guinea‐Bissau; Guinea‐Bisáu; West Africa; coastal ecology; conocimiento ecológico local; conservación; conservation; conservation ecology; ecología costera; ecología de la conservación; elasmobranchs; elasmobranquios; fisheries; local ecological knowledge; pesquerías; pesquerías artesanales; small‐scale fisheries; África Occidental Local Abstract: [Publisher, Spanish; Castilian] Reconstrucción histórica de las tendencias de captura de tiburones y rayas amenazadas con base en el conocimiento ecológico de los pescadores Resumen Las pesquerías artesanales suelen carecer de información histórica sobre las capturas de tiburones y rayas, lo que dificulta su gestión. Reconstruimos las tendencias históricas de las capturas y la presión pesquera actual combinando los conocimientos ecológicos locales, el recuento de embarcaciones por satélite y un estudio a corto plazo de los lugares de desembarque. Para probar la eficacia de este método, nos centramos en el archipiélago de Bijagós (Guinea‐Bisáu, África Occidental), donde faltan datos históricos de pesca. Trabajamos con rayas bentónicas (rayas látigo (Dasyatidae)) y rayas mariposa (Gymnura spp.), rayas bentopelágicas (rayas águila pico de pato (Aetomylaeus bovinus) y rayas nariz de vaca (Rhinoptera marginata)), peces guitarra (Glaucostegus y Rhinobatos spp.), los tiburones réquiem (Carcharhinidae) y los tiburones martillo (Sphyrna spp.) disminuyeron su abundancia entre un 81.5 y un 96.7% (según la especie) entre 1960 y 2020. El esfuerzo pesquero aumentó anualmente: la duración de las mareas en un 42% (ES 3.4), el número de buques pesqueros en el mar percibido por los pescadores en un 36.3% (1.0) (1960‐2020) y el número de buques en un 12% (1.1) (2007‐2022). Estimamos que, en 2020, los buques pesqueros capturaron colectivamente entre 61 y 264 tiburones y entre 522 y 2,194 rayas al día en el archipiélago, dependiendo de la proporción de la flota pesquera activa (es decir, una actividad baja de la flota del 18% y una actividad alta de la flota del 80%). Abogamos por reducir las capturas de tiburones y rayas regulando el tamaño de la flota, reforzando los límites de las zonas protegidas y recopilando información dependiente de los pescadores sobre los desembarcos de tiburones y rayas para salvaguardar estas especies vulnerables y los medios de subsistencia costeros. Demostramos la eficacia de utilizar este triple enfoque para proporcionar datos de referencia sobre la pesca de tiburones, un reto habitual en zonas con pesquerías artesanales y una capacidad de investigación limitada. |
| Entry Date(s): | Date Created: 20250601 Date Completed: 20250922 Latest Revision: 20250924 |
| Update Code: | 20250924 |
| PubMed Central ID: | PMC12451511 |
| DOI: | 10.1111/cobi.70059 |
| PMID: | 40450545 |
| Database: | MEDLINE |
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Nájsť tento článok vo Web of Science | Abstract: | Small-scale fisheries often lack historical shark and ray catch information, hampering their management. We reconstructed historical catch trends and current fishing pressure by combining local ecological knowledge, satellite-based vessel counts, and a short-term landing-site survey. To test the effectiveness of this method, we focused on the Bijagós Archipelago (Guinea-Bissau, West Africa), where historical fisheries data are lacking. Benthic rays (stingrays [Dasyatidae] and butterfly rays [Gymnura spp.]), benthopelagic rays (duckbill eagle rays [Aetomylaeus bovinus] and cownose rays [Rhinoptera marginata]), guitarfish (Glaucostegus and Rhinobatos spp.), requiem sharks (Carcharhinidae), and hammerhead sharks (Sphyrna spp.) declined in abundance by 81.5-96.7% (species dependent) from 1960 to 2020. Fishing effort increased annually: fishing trip duration by 42.0% (SE 3.4), numbers of fishing vessels at sea as perceived by fishers by 36.3% (1.0) (1960-2020), and number of vessels by 12.0% (1.1) (2007-2022). We estimated that in 2020, fishing vessels collectively captured 61-264 sharks and 522-2194 rays per day in the archipelago, depending on the proportion of the fishing fleet that was active (i.e., low fleet activity of 18% and high fleet activity of 80%). We advocate for reducing shark and ray catches by regulating fleet size, reinforcing boundaries of protected areas, and collecting fisher-dependent information on shark and ray landings to safeguard these vulnerable species and coastal livelihoods. We demonstrated the effectiveness of using this 3-pronged approach to provide baseline data on shark fisheries, a common challenge in areas with small-scale fisheries and limited research capacity.<br /> (© 2025 The Author(s). Conservation Biology published by Wiley Periodicals LLC on behalf of Society for Conservation Biology.) |
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| ISSN: | 1523-1739 |
| DOI: | 10.1111/cobi.70059 |