Circle hook effectiveness for the mitigation of sea turtle bycatch and capture of target species in a Brazilian pelagic longline fishery

Sales, Gilberto; Giffoni, Bruno; Fiedler, Fernando Niemeyer; Azevedo, Venâncio Guedes de; Kotas, Jorge Eduardo; Swimmer, Yonat; Bugoni, Leandro

doi:10.1002/aqc.1106

Cited by 73 publications

(69 citation statements)

References 39 publications

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“…In general, national pelagic longline fleet based on the port of Itajaí (SC) use all the SE/S regions as their main fishing area. The composition of species landed by national fleet over the period studied corroborates the data given in other studies in the region (MENEZES DE LIMA et al, 2000;MAZZOLENI, 2004;SALES et al, 2010;MOURATO et al, 2011). This composition reflects the interest of each vessel on each fishing trip in particular target species.…”

Section: Discussionsupporting

confidence: 87%

Spatio-temporal distribution and target species of longline fisheries off Southeastern/Southern Brazil between 2000 and 2011

Fiedler

Sales

Giffoni³

et al. 2015

Braz. j. oceanogr.

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In the presente study, cluster analysis was performed to classify 1080 interviews with captains of national pelagic longline fleet (2000 to 2011), and 38 trips of the chartered fleet (2003 to 2008), in relation to the composition of species landed. For the national fleet 4 groups were identified: 1 - Albacores, 2 - Blue shark, 3 - Swordfish, and 4 - Dolphinfish. For the chartered fleet 3 groups were identified: 1 - Swordfish, 2 - Blue shark, and 3 - Albacores. The results indicated that part of the national fleet change their strategies according to the availability of the target species and market demand (internal and external). A part of the fleet from Espírito Santo state operates in the region between December and March, exclusively to capture dolphinfish. The chartered fleet differed from the national one as regards the fishing areas of each target species, mainly as regards swordfish and blue shark. Despite the great difference in the data sets, it is evident that both the national and the chartered fleets operated in accordance with their peculiarities and technological development, adopting strategies that optimize catches and net profits per trip.

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Section: Discussionsupporting

confidence: 87%

Spatio-temporal distribution and target species of longline fisheries off Southeastern/Southern Brazil between 2000 and 2011

Fiedler

Sales

Giffoni³

et al. 2015

Braz. j. oceanogr.

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“…Despite these improvements and other important technological and policy improvements (43), bycatch remains a significant threat to many populations of megafauna, because many nations and regional fisheries management agencies do not require or enforce the use of proven bycatch reduction measures; bycatch mitigation is long on potential solutions and short on effective implementation (44). Furthermore, although targeted, top-down mitigation implementation and enforcement have proven effective for some fishing sectors [e.g., seabird bycatch mitigation measures in the Southern Ocean (45)], community-level engagement is needed to successfully reduce bycatch in lessregulated, small-scale fisheries (46)(47)(48).…”

Section: Discussionmentioning

confidence: 99%

Global patterns of marine mammal, seabird, and sea turtle bycatch reveal taxa-specific and cumulative megafauna hotspots

Lewison

Crowder

Wallace³

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

359

297

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Recent research on ocean health has found large predator abundance to be a key element of ocean condition. Fisheries can impact large predator abundance directly through targeted capture and indirectly through incidental capture of nontarget species or bycatch. However, measures of the global nature of bycatch are lacking for air-breathing megafauna. We fill this knowledge gap and present a synoptic global assessment of the distribution and intensity of bycatch of seabirds, marine mammals, and sea turtles based on empirical data from the three most commonly used types of fishing gears worldwide. We identify taxa-specific hotspots of bycatch intensity and find evidence of cumulative impacts across fishing fleets and gears. This global map of bycatch illustrates where data are particularly scarce-in coastal and small-scale fisheries and ocean regions that support developed industrial fisheries and millions of small-scale fishers-and identifies fishing areas where, given the evidence of cumulative hotspots across gear and taxa, traditional species or gear-specific bycatch management and mitigation efforts may be necessary but not sufficient. Given the global distribution of bycatch and the mitigation success achieved by some fleets, the reduction of air-breathing megafauna bycatch is both an urgent and achievable conservation priority.fisheries bycatch | trophic downgrading | longlines | gillnets | trawls

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“…All are globally threatened by extinction (IUCN 2008) and included in the Brazilian list of threatened species as ''Vulnerable'' (loggerhead Caretta caretta and green turtle Chelonia mydas), ''Endangered'' (olive ridley Lepidochelys olivacea and hawksbill Eretmochelys imbricata), or ''Critically Endangered'' (leatherback Dermochelys coriacea) (MMA 2003). Capture of all five species has been recorded by different fisheries in Brazil throughout the year; including pelagic longlines (Kotas et al 2004;Domingo et al 2006a;López-Mendilaharsu et al 2007;Sales et al 2010), corrals (Bahia andBondioli 2010), shrimp trawling (Silva et al 2010) and coastal gillnets (Marcovaldi et al 2001;Lima et al 2010). Although high-seas driftnet fisheries are also reported to entangle sea turtles in the SW Atlantic Ocean, captures were not quantified, and thus, the real impact of these fisheries on sea turtle populations is unknown (Domingo et al 2006b).…”

Section: Introductionmentioning

confidence: 96%

Driftnet fishery threats sea turtles in the Atlantic Ocean

et al. 2012

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Fisheries are recognised as a major threat to sea turtles worldwide. Oceanic driftnets are considered the main cause of the steep decline in Pacific Ocean populations of the leatherback sea turtle Dermochelys coriacea. The world's largest leatherback population nests in West Africa and migrates across the Atlantic Ocean to feed off the South American coast. There, the turtles encounter a range of fisheries, including the Brazilian driftnet fishery targeting hammerhead sharks. From 2002 to 2008, 351 sea turtles were F. N. Fiedler (&) Fundação Pró-TAMAR,incidentally caught in 41 fishing trips and 371 sets. Leatherbacks accounted for 77.3% of the take (n = 252 turtles, capture rate = 0.1405 turtles/km of net), followed by loggerheads Caretta caretta (47 individuals, capture rate = 0.0262 turtles/km of net), green turtles Chelonia mydas (27 individuals, capture rate = 0.0151 turtles/km of net) and unidentified hard-shelled turtles (25 individual, capture rate = 0.0139 turtles/km of net) that fell off the net during hauling. Immediate mortality (i.e., turtles that were dead upon reaching the vessel, excluding post-release mortality) was similar among the species and accounted for 22.2 to 29.4% of turtles hauled onboard. The annual catch by this fishery ranged from 1,212 to 6,160 leatherback turtles, as estimated based on bootstrap procedures under different fishing effort scenarios in the 1990s. The present inertia in law and enforcement regarding gillnet regulations in Brazil could result in the reestablishment of the driftnet fishery, driving rates of leatherback mortality to levels similar to those observed in previous decades. This development could potentially lead to the collapse of the South Atlantic leatherback population, mirroring the decline of the species in the Pacific. In light of these potential impacts and similar threats to other pelagic mega fauna, we recommend banning this type of fishery in the region.

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Circle hook effectiveness for the mitigation of sea turtle bycatch and capture of target species in a Brazilian pelagic longline fishery

Cited by 73 publications

References 39 publications

Spatio-temporal distribution and target species of longline fisheries off Southeastern/Southern Brazil between 2000 and 2011

Spatio-temporal distribution and target species of longline fisheries off Southeastern/Southern Brazil between 2000 and 2011

Global patterns of marine mammal, seabird, and sea turtle bycatch reveal taxa-specific and cumulative megafauna hotspots

Driftnet fishery threats sea turtles in the Atlantic Ocean

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