Shark repellents: a comparison of alternative methods to mitigate bycatch

Detalhes bibliográficos
Autor(a) principal: Coelho, Vasco Alexandre da Gandra
Data de Publicação: 2023
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10451/57449
Resumo: Tese de mestrado, Ecologia Marinha, 2023, Universidade de Lisboa, Faculdade de Ciências
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spelling Shark repellents: a comparison of alternative methods to mitigate bycatchrepelentes de tubarãocaptura acidental de tubarõesredução de mordidasnovos materiaisTeses de mestrado - 2023Departamento de Biologia AnimalTese de mestrado, Ecologia Marinha, 2023, Universidade de Lisboa, Faculdade de CiênciasShark populations have been suffering a tremendous decrease in recent years, with many species currently threatened, mainly due to overfishing and climate change. Most fishing accounts for sharks occur when they are accidentally captured as bycatch. To mend this issue, shark repellent research has been developing over the last 70 years, however, it is mostly hampered by physical or technical constraints that result in no clear solutions. Sharks are behaviorally complex organisms, which only entangles the path to find a single and simple repellent device even more. In this dissertation, the effectiveness of different repellents was tested on a well-studied model shark (Scyliorhinus canicula) based on the most recent advances in the field. Under this context, I exposed sharks to a wide variety of repellents: i) chemicals (necromones), and ii) electrosensory, permanent magnets (neodymium (Nd), ferrite (α-Fe)), repellent X, and a procedural control, that is a component of repellent X, both in control conditions and in a climate change scenario (ocean warming; 19ºC). The present results indicate that the presence of the repellent X significantly decreased the number of shark bites, both under warming conditions and when combined with necromones. Our findings represent a promising step towards finding an effective and technologically simple shark repellent device. The repellent X possess low acquisition costs, no detectable dissolution rates, easy maintenance and appliance, and a positive repelling effect. Furthermore, to improve the repelling effect, a combination of two types of repellents, such as necromones and repellent X, could be used. Future studies should focus on field work experiments, to test the efficency of this repellent on wild shark species. As their populations continue to decline at a rapid rate, the need to develop economic, harmless, and successful shark repellents is more urgent than ever.Pegado, Maria RitaRosa, Rui Afonso Bairrão da, 1976-Repositório da Universidade de LisboaCoelho, Vasco Alexandre da Gandra202320232026-03-10T00:00:00Z2023-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10451/57449enginfo:eu-repo/semantics/embargoedAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-11-08T17:05:52Zoai:repositorio.ul.pt:10451/57449Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T22:07:56.141769Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Shark repellents: a comparison of alternative methods to mitigate bycatch
title Shark repellents: a comparison of alternative methods to mitigate bycatch
spellingShingle Shark repellents: a comparison of alternative methods to mitigate bycatch
Coelho, Vasco Alexandre da Gandra
repelentes de tubarão
captura acidental de tubarões
redução de mordidas
novos materiais
Teses de mestrado - 2023
Departamento de Biologia Animal
title_short Shark repellents: a comparison of alternative methods to mitigate bycatch
title_full Shark repellents: a comparison of alternative methods to mitigate bycatch
title_fullStr Shark repellents: a comparison of alternative methods to mitigate bycatch
title_full_unstemmed Shark repellents: a comparison of alternative methods to mitigate bycatch
title_sort Shark repellents: a comparison of alternative methods to mitigate bycatch
author Coelho, Vasco Alexandre da Gandra
author_facet Coelho, Vasco Alexandre da Gandra
author_role author
dc.contributor.none.fl_str_mv Pegado, Maria Rita
Rosa, Rui Afonso Bairrão da, 1976-
Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Coelho, Vasco Alexandre da Gandra
dc.subject.por.fl_str_mv repelentes de tubarão
captura acidental de tubarões
redução de mordidas
novos materiais
Teses de mestrado - 2023
Departamento de Biologia Animal
topic repelentes de tubarão
captura acidental de tubarões
redução de mordidas
novos materiais
Teses de mestrado - 2023
Departamento de Biologia Animal
description Tese de mestrado, Ecologia Marinha, 2023, Universidade de Lisboa, Faculdade de Ciências
publishDate 2023
dc.date.none.fl_str_mv 2023
2023
2023-01-01T00:00:00Z
2026-03-10T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10451/57449
url http://hdl.handle.net/10451/57449
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/embargoedAccess
eu_rights_str_mv embargoedAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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