Vulnerable species associated with surface longline fishing in Ecuadorian mother ships
DOI:
https://doi.org/10.47193/mafis.3822025010102Keywords:
seabird, Biplot, marine mammals, sharks, sea turtleAbstract
Surface longlining is a fishing gear aimed at catching pelagic fish, but it can also hook vulnerable species such as sharks, turtles, seabirds, and marine mammals. The main purpose of this work was to analyze the incidence of these groups in the fishing activities of Ecuadorian boats. The Public Institute of Aquaculture and Fisheries Research provided the database, corresponding to records of observers on board from 2019 to 2023. The bait used was primarily Dosidicus gigas. Type ‘C’ and ‘J’ hooks were used, with the latter being the most common. A total of 14 species of sharks, one skate (Pteroplatytrygon violacea), and one manta ray (Mobula birostris) were involved in longline fishing. Prionace glauca, Alopias pelagicus, Carcharhinus falciformis, A. superciliosus, and Isurus oxyrinchus had the highest annual incidence. Sharks showed a low relationship with the number of sets. Twenty-five species of seabirds were reported, either feeding or wandering. Oceanites gracilis and Procellaria parkinsoni had the highest incidence. Dolphins were the most representative marine mammals, with the genus Delphinus being the most abundant, and there was no evidence of mortality. Turtles Chelonia mydas and Lepidochelys olivacea had recurrent records, while Caretta caretta and Dermochelys coriacea were sporadic. Sharks were the only group that presented mortality, while turtles showed body injuries without mortality. Under this scenario, it is necessary to develop and apply management measures that promote the protection of vulnerable species.
Downloads
Metrics
Author Biographies
René Zambrano, Instituto Superior Tecnológico “Luis Arboleda Martínez” Extensión Jaramijó, 132150 - Jaramijó, Ecuador - Manejo y Conservación de Recursos Naturales S. A. S., Alborada etapa XIII, 090509 - Guayaquil, Ecuador
https://orcid.org/0000-0002-0603-7475Daniel Soriano, Programa de Maestría en Biodiversidad y Cambio Climático, Universidad Estatal Península de Santa Elena, 240203 - Santa Elena, Ecuador
Richard Duque, Programa de Maestría en Biodiversidad y Cambio Climático, Universidad Estatal Península de Santa Elena, 240203 - Santa Elena, Ecuador
Marco Herrera, Programa de Especies Vulnerables, Proceso de Investigación de Recursos Bioacuáticos y su Ambiente, Instituto Público de Investigación de Acuicultura y Pesca, 090308 - Guayaquil, Ecuador
References
Afonso AS, Santiago R, Hazin H, Hazin FHV. 2012. Shark bycatch and mortality and hook bite-offs in pelagic longlines: interactions between hook types and leader materials. Fish Res. 131-133: 9-14. DOI: https://doi.org/10.1016/j.fishres.2012.07.001 DOI: https://doi.org/10.1016/j.fishres.2012.07.001
Anderson ORJ, Small CJ, Croxall JP, Dunn EK, Sullivan BJ, Yates O, Black A. 2011. Global seabird bycatch in longline fisheries. Endanger Species Res. 14 (2): 91-106. DOI: https://doi.org/10.3354/esr00347 DOI: https://doi.org/10.3354/esr00347
Barker MJ, Schluessel V. 2005. Managing global shark fisheries: suggestions for prioritizing management strategies. Aquat Conserv. 15 (4): 325-347. DOI: https://doi.org/10.1002/aqc.660 DOI: https://doi.org/10.1002/aqc.660
Barrios-Garrido H, Bolivar J, Benavides L, Viloria J, Dugarte F, Wildermann N. 2017. Evaluación de la pesquería de palangre artesanal y su efecto en la raya látigo (Dasyatis guttata) en Isla Zapara, Golfo de Venezuela. Lat Am J Aquat Res. 45 (2): 302-310. DOI: https://doi.org/10.3856/vol45-issue2-fulltext-6 DOI: https://doi.org/10.3856/vol45-issue2-fulltext-6
Castro E. 2019. La pesca de pelágicos grandes con palangre de superficie en el Océano Pacífico Oriental: análisis espacial, caracterización y variabilidad interanual de las capturas extraídas por la flota del Ecuador [tesis de maestría]. Alicante: Universidad de Alicante.
Clarke S, Sato M, Small C, Sullivan B, Inoue Y, Ochi D. 2014. Bycatch in lonline fisheries for tuna and tuna-like species: a global review of status and mitigation measures. FAO Fish Aquaculture Tech Pap. 588: 1-199.
Di Rienzo JA, Casanoves F, Balzarini MG, Gonzalez L, Tablada M, Robledo CW. 2020. InfoStat versión 2020. [consultado 31 agosto 2023]. http://www.infostat.com.ar.
Dytham C. 2011. Choosing and using statistics: a biologist’s guide. 3ra ed. Wiley-Blackwell. 298 p.
Gilman E, Huang HW. 2017. Review of effects of pelagic longline hook and bait type on sea turtle catch rate, anatomical hooking position and at-vessel mortality rate. Rev Fish Biol Fish. 27 (1): 43-52. DOI: https://doi.org/10.1007/s11160-016-9447-9 DOI: https://doi.org/10.1007/s11160-016-9447-9
Gómez W. 2016. Variación temporal en el desembarque de peces pelágicos grandes y tiburones de la flota palangrera oceánica en Manta, Ecuador [tesis de maestría]. Guayaquil: Universidad de Guayaquil.
González A, Vega R, Barbieri MÁ, Yáñez E. 2012. Determinación de los factores que inciden en la captura incidental de aves marinas en la flota palangrera pelágica chilena. Lat Am J Aquat Res. 40 (3): 786-799. DOI: https://doi.org/10.3856/vol40-issue3-fulltext-25
Herrera M, Coello D, Peralta M, Cajas J, Castro R, Elías E, Chavarría J. 2010. Pesca exploratoria del recurso dorado (Coryphaena hippurus) frente a la costa ecuatoriana durante marzo de 2008. Bol Cient Tec Inst Nac Pesca Ecuad. 20 (10): 29-51.
Lewison RL, Crowder LB. 2007. Putting longline bycatch of sea turtles into perspective. Conserv Biol. 21 (1): 7986. DOI: https://doi.org/10.1111/j.1523-1739.2006.00592.x DOI: https://doi.org/10.1111/j.1523-1739.2006.00592.x
Martínez-Ortiz J, Aires-da-Silva AM, Lennert-Cody CE, Maunder MN. 2015. The Ecuadorian artisanal fishery for large pelagics: Species composition and spatio-temporal dynamics. PLoS ONE. 10 (8): e0135136. DOI: https://doi.org/10.1371/journal.pone.0135136 DOI: https://doi.org/10.1371/journal.pone.0135136
Oliver S, Braccini M, Newman SJ, Harvey ES. 2015. Global patterns in the bycatch of sharks and rays. Mar Policy. 54: 86-97. DOI: https://doi.org/10.1016/j.marpol.2014.12.017 DOI: https://doi.org/10.1016/j.marpol.2014.12.017
Pincay J. 2022. Captura de dorado versus especies secundarias e incidentales en la pesquería de palangre de superficie a la deriva con anzuelo “fino o doradero” en el Ecuador. En: Plan de Acción Nacional para la Conservación y el Manejo del Recurso Dorado en Ecuador (PAN Dorado). Manta: Ministerio de Producción, Comercio Exterior, Inversiones y Pesca. p. 1-9.
Porcher IF, Darvell BW. 2022. Shark fishing vs. conservation: analysis and synthesis. Sustainability. 14 (15): 9548. DOI: https://doi.org/10.3390/su14159548 DOI: https://doi.org/10.3390/su14159548
Roberson LA, Wilcox C. 2022. Bycatch rates in fisheries largely driven by variation in individual vessel behaviour. Nat Sustain. DOI: https://doi.org/10.1038/s41893-022-00865-0 DOI: https://doi.org/10.1038/s41893-022-00865-0
Santa-Hernández H, Macías-Zamora R, Valdez FJJ. 1998. Selectividad del sistema de palangre utilizado por la flota mexicana en la Zona Económica Exclusiva. Cienc Mar. 24 (2): 193-210. http://www.redalyc.org/articulo.oa?id=48024205. DOI: https://doi.org/10.7773/cm.v24i2.745
Tavares R. 2005. Abundancia y distribución de tiburones en el Parque Nacional Archipiélago de Los Roques y otras islas oceánicas venezolanas. Cienc Mar. 31 (2): 441-454. http://www.redalyc.org/articulo.oa?id=48031211.
Watson JW, Epperly SP, Shah AK, Foster DG. 2005. Fishing methods to reduce sea turtle mortality associated with pelagic longlines. Can J Fish Aquat Sci. 62 (5): 965-981. DOI: https://doi.org/10.1139/f05-004 DOI: https://doi.org/10.1139/f05-004
Werner TB, Northridge S, Press KMC, Young N. 2015. Mitigating bycatch and depredation of marine mammals in longline fisheries. ICES J Mar Sci. 72 (5): 1576-1586. DOI: https://doi.org/10.1093/icesjms/fsv092 DOI: https://doi.org/10.1093/icesjms/fsv092
Zambrano R, Coello D, Herrera M. 2023. Bycatch in an experimental fishery for Patagonian toothfish (Dissostichus eleginoides, Nototheniidae) in Ecuadorian oceanic waters. J Mar Bioll Assoc UK. 103: e73. DOI: https://doi.org/10.1017/S0025315423000632 DOI: https://doi.org/10.1017/S0025315423000632
Zhou C, Brothers N. 2022. Seabird bycatch vulnerability in pelagic longline fisheries based on modelling of a long-term dataset. Bird Conserv Int. 32 (2): 259-274. DOI: https://doi.org/10.1017/S0959270921000046 DOI: https://doi.org/10.1017/S0959270921000046
Published
How to Cite
Issue
Section
License
Copyright (c) 2024 René Zambrano, Daniel Soriano, Richard Duque, Marco Herrera
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Authors of articles published in Marine and Fishery Sciences retain copyright on their articles, except for any third-party images and other materials added by Marine and Fishery Sciences, which are subject to copyright of their respective owners. Authors are therefore free to disseminate and re-publish their articles, subject to any requirements of third-party copyright owners and subject to the original publication being fully cited. Visitors may also download and forward articles subject to the citation requirements. The ability to copy, download, forward or otherwise distribute any materials is always subject to any copyright notices displayed. Copyright notices must be displayed prominently and may not be obliterated, deleted or hidden, totally or partially.
This journal offers authors an Open Access policy. Users are allowed to read, download, copy, distribute, print, search, or link to the full texts of the articles, or use them for any other legal purpose within the Creative Commons 4.0 license (BY-NC-SA), without asking prior permission from the publisher or the author. This is in accordance with the BOAI definition of Open Access.
