Navegando por Assunto "Longline"

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Artigo
Captura incidental de tortugas marinas por las flotas de palangre pelágico de Brasil y Uruguay (1998 - 2010)
(2014) GIFFONI, B.; LEITE JR, N.; MILLER, P.; PONS, M.; SALES, G.; DOMINGO, A.
Sea turtles are highly migratory species and during their long life cycle they are face to different threats. One of the biggest threat is the incidental captures by fisheries, thus longline fishery has been pointed out as great concern due to the high captures rates. This work summarize the incidental capture of sea turtles by Brazilian and Uruguayan longline fleet, taking account different aspects to be considered in sea turtles productivity and susceptibility analyses - PSA. The data analyzed were collected by observers of the Programa Nacional de Observadores a Bordo de la Flota Atunera Uruguaya (PNOFA) from Uruguay, and Programa Nacional de Observadores de Bordo da Frota Pesqueira do Brasil (PROBORDO), Fundação Pró-TAMAR, Instituto ALBATROZ and Núcleo de Educação e Monitoramento Ambiental (NEMA) from Brazil. On total 25.164.089 hooks were sampled by Brazil and Uruguay between 2008 and 2010. On average, the sampled effort represented 1,5% of total effort applied at the same area by ICCAT CPCs. Loggerhead was the specie most captured (n =6.594), followed by Leatherback (n = 1.379) and Olive ridley (n = 600). All specie nest in Brazil. Regarding to productivity aspects, the Brazilian population of loggerhead, leatherback and olive ridley are increasing. For the Susceptibility analyses and considering availability, 7 different RMUs are being impacted by longline. Related to encounterability, the 3 turtle species spent the most time at the same depth range as Brazilian and Uruguayan longline toward to catch swordfish. For selectivity, juveniles of the loggerhead turtle are the most captured, while for olive ridley and leatherback, sub-adult and adult have been most captured by longline fleet of both countries.
Artigo
Evaluation of interaction between sea turtles and pelagic longline fisheries in Brazil
(2007-02) MARCOVALDI, M. A; SALES, G; THOME, J. C. A; SILVA, A. C. C. D; GIFFONI, B. B
Artigo
MANAGEMENT UNITS: CHALLENGES TO PROMOTE UNDERSTANDING AND CONSERVATION OF MARINE TURTLES IN OCEANIC AREAS
(2015) Sales, G.; Britto, M.; Fiedler, F.N.; Giffoni, B.; Domingo, A.; Leite, N.; Miller, Philip
This document presents a discussion and some recommendations with regards to appropriate management units to promote the conservation of marine turtles in oceanic areas used by tuna longline fisheries under ICCAT. We comment on the utility of using Regional Management Units (RMUs) for marine turtles as proposed by Wallace et al. (2010). Per Wallace (2010 et al), RMUs refer to geographically explicit population segments, based on biogeographical data (e.g. nesting sites, genetics, telemetry) that can be applied to regionally appropriate management issues. RMUs are not intended to represent complete geographic distributions of species on global or regional scales, but rather distributions that are anchored to landmasses by known nesting site(s) and/or genetic stock origins and defined by biogeographical information. While RMUs are important to contribute to our understanding of key aspects of marine turtle populations, this analysis indicates that marine turtle RMUs do not cover all requirements to define management units to the ICCAT fisheries. Considering that the longline fishing are compose of different kind of fisheries, using distinct fishery strategies and operate in distinct at-sea regions, these fisheries interact with marine turtle mixed stocks in foraging and developmental areas. We recommend ICCAT adopt the “Fishery”as the principal concept to define Management Unit (rather than sea turtle RMUs) in order to understand and reduce marine turtle interactions in the ICCAT fisheries