Survivorship of species caught in a longline tuna fishery in the western equatorial Atlantic Ocean
| Autor: | Bruno L. Mourato, Felipe Carvalho, José C. Pacheco, André S. Afonso, Diogo Martins Nunes, Fábio H. V. Hazin, Humberto G. Hazin, Ilka Branco-Nunes |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
endocrine system Hook Fishing Aquatic Science Biology bycatch Oceanography 01 natural sciences Survivorship curve parasitic diseases hook timer 010604 marine biology & hydrobiology Mortality rate Swordfish Pelagic zone 04 agricultural and veterinary sciences hooking location musculoskeletal system mortality Fishery Bycatch circle hooks pelagic longline 040102 fisheries 0401 agriculture forestry and fisheries bacteria sense organs Tuna |
| Zdroj: | Latin american journal of aquatic research, Volume: 47, Issue: 5, Pages: 798-807, Published: NOV 2019 Latin american journal of aquatic research v.47 n.5 2019 SciELO Chile CONICYT Chile instacron:CONICYT |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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