Survivorship of species caught in a longline tuna fishery in the western equatorial Atlantic Ocean
ABSTRACT Longlines bearing “hook timers” (HTs) and alternating circle (15/0 and 17/0) and “J” (10/0) hooks were employed off the coast of Brazil to measure differences in fishing mortality associated with hook type and on-hook time between capture and boarding...
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| Lenguaje: | English |
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Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
2019
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oai:scielo:S0718-560X20190005007982019-12-05Survivorship of species caught in a longline tuna fishery in the western equatorial Atlantic OceanNunes,Diogo M.Hazin,Fabio H.V.Branco-Nunes,Ilka S.L.Hazin,HumbertoPacheco,José CarlosAfonso,Andre S.Mourato,Bruno L.Carvalho,Felipe C. mortality circle hooks pelagic longline hook timer bycatch hooking location ABSTRACT Longlines bearing “hook timers” (HTs) and alternating circle (15/0 and 17/0) and “J” (10/0) hooks were employed off the coast of Brazil to measure differences in fishing mortality associated with hook type and on-hook time between capture and boarding. A total of 431 HTs were activated, revealing a clear pattern of the increased mortality rate of fishes associated with increased on-hook time. Swordfish had high mortality rates, unlike blue sharks, which had low mortality rates regardless of hook type and the location in which the hook was transfixed. The six species of tunas and billfishes examined in this study showed a strong association between hooking location and the animal's release condition, with reduced mortality associated with individuals hooked externally. Results suggest that knowledge of factors affecting the survival of pelagic fishes caught in longline fisheries may enable the development and adoption of fishing methods to reduce mortality of longline bycatch.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.47 n.5 20192019-11-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2019000500798en10.3856/vol47-issue5-fulltext-9 |
| institution |
Scielo Chile |
| collection |
Scielo Chile |
| language |
English |
| topic |
mortality circle hooks pelagic longline hook timer bycatch hooking location |
| spellingShingle |
mortality circle hooks pelagic longline hook timer bycatch hooking location Nunes,Diogo M. Hazin,Fabio H.V. Branco-Nunes,Ilka S.L. Hazin,Humberto Pacheco,José Carlos Afonso,Andre S. Mourato,Bruno L. Carvalho,Felipe C. Survivorship of species caught in a longline tuna fishery in the western equatorial Atlantic Ocean |
| description |
ABSTRACT Longlines bearing “hook timers” (HTs) and alternating circle (15/0 and 17/0) and “J” (10/0) hooks were employed off the coast of Brazil to measure differences in fishing mortality associated with hook type and on-hook time between capture and boarding. A total of 431 HTs were activated, revealing a clear pattern of the increased mortality rate of fishes associated with increased on-hook time. Swordfish had high mortality rates, unlike blue sharks, which had low mortality rates regardless of hook type and the location in which the hook was transfixed. The six species of tunas and billfishes examined in this study showed a strong association between hooking location and the animal's release condition, with reduced mortality associated with individuals hooked externally. Results suggest that knowledge of factors affecting the survival of pelagic fishes caught in longline fisheries may enable the development and adoption of fishing methods to reduce mortality of longline bycatch. |
| author |
Nunes,Diogo M. Hazin,Fabio H.V. Branco-Nunes,Ilka S.L. Hazin,Humberto Pacheco,José Carlos Afonso,Andre S. Mourato,Bruno L. Carvalho,Felipe C. |
| author_facet |
Nunes,Diogo M. Hazin,Fabio H.V. Branco-Nunes,Ilka S.L. Hazin,Humberto Pacheco,José Carlos Afonso,Andre S. Mourato,Bruno L. Carvalho,Felipe C. |
| author_sort |
Nunes,Diogo M. |
| title |
Survivorship of species caught in a longline tuna fishery in the western equatorial Atlantic Ocean |
| title_short |
Survivorship of species caught in a longline tuna fishery in the western equatorial Atlantic Ocean |
| title_full |
Survivorship of species caught in a longline tuna fishery in the western equatorial Atlantic Ocean |
| title_fullStr |
Survivorship of species caught in a longline tuna fishery in the western equatorial Atlantic Ocean |
| title_full_unstemmed |
Survivorship of species caught in a longline tuna fishery in the western equatorial Atlantic Ocean |
| title_sort |
survivorship of species caught in a longline tuna fishery in the western equatorial atlantic ocean |
| publisher |
Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar |
| publishDate |
2019 |
| url |
http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2019000500798 |
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| _version_ |
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