Incidental capture of green turtle ( Chelonia mydas ) in gillnets of small-scale fisheries in the Paranaguá Bay, Southern Brazil

López-Barrera, Ellie Anne; Longo, Guilherme O.; Monteiro‐Filho, Emygdio L. A.

doi:10.1016/j.ocecoaman.2011.12.023

Cited by 40 publications

(34 citation statements)

References 12 publications

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“…Although information describing decompression sickness in C. mydas is scarce, two fresh C. mydas carcasses found stranded in the state of Paraná, southern Brazil, demonstrated copious bubbles in the heart and major vessels ( Figure 2D). Along the Brazilian coast, bycatch is also the main threat to C. mydas conservation, and affects animals in both coastal and oceanic areas (GALLO et al, 2006;PUPO et al, 2006;SALES et al, 2008;SANTOS et al, 2011;FIEDLER et al, 2012;LÓPEZ-BARRERA et al, 2012;MONTEIRO et al, 2016). The high density of small-scale fisheries overlaps coastal areas used by juvenile C. mydas.…”

Section: Mortality and Morbidity Of Chelonia Mydas Associated With Humentioning

confidence: 99%

“…The high density of small-scale fisheries overlaps coastal areas used by juvenile C. mydas. Ethnobiological analyses in the state of Santa Catarina and Paraná, southern Brazil, indicate that geographic area, depth and the mesh size of nets are associated with increased bycatches in feeding areas (PUPO et al, 2006;LÓPEZ-BARRERA et al, 2012).…”

Section: Mortality and Morbidity Of Chelonia Mydas Associated With Humentioning

confidence: 99%

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The green turtle Chelonia mydas as a marine and coastal environmental sentinels: anthropogenic activities and diseases

Domiciano

Domit

Bracarense

2017

SCA

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The green turtle Chelonia mydas as a marine and coastal environmental sentinels: anthropogenic activities and diseases Tartaruga-verde, Chelonia mydas, como sentinela do ambiente marinho e costeiro: atividades antrópicas e enfermidades AbstractThe green turtle Chelonia mydas is a widely distributed, slowly maturing species with a complex life cycle, using both oceanic and coastal environments. The species is exposed to different threats and is considered an environmental sentinel that indicates variation among, and the severity of hazards to marine ecosystems. This study aimed to describe both anthropogenic impacts, and infectious and parasitic diseases in C. mydas -including cases along the Brazilian coast -and implications for conservation. Bycatch is reported as the main threat to the conservation of this species, followed by debris ingestion, collisions with boats, dredging, and chronic environmental contamination. All of these impacts may directly or indirectly cause death, by facilitating contact with pathological agents and by increasing vulnerability to secondary diseases. The pathological agents associated with lesions include viruses, bacteria, fungi, protozoa, and helminths. Fibropapillomatosis is an example of a chronic disease characterized by cutaneous and visceral tumors that affects mostly juvenile C. mydas worldwide and is associated with the Chelonid herpesvirus 5. The bacterias Vibrio alginolyticus, Aeromonas hydrophila, and Pseudomonas fluorescens are found in the aquatic environment and among C. mydas lesions in various organs. Trematode adults and eggs of the family Spirorchiidae are also frequent in systemic cardiovascular diseases of C. mydas. The direct impacts of anthropogenic activities and diseases are synergistic and may affect the specie's health and conservation. Therefore, the monitoring and systematic diagnosing of diseases and causes of death -including necropsy, histopathology, and molecular exams -are necessary to assess a population's health, to support appropriate decisions of coastal management and to target future research topics that optimize C. mydas conservation. Key words: Bycatch. Conservation. Debris ingestion. Morbidity. Pathogenic agents. Sea turtle. ResumoA tartaruga-verde, Chelonia mydas, possui ampla distribuição geográfica, reprodução tardia e complexo ciclo de vida, habitando áreas costeiras e oceânicas. Devido a essas características, a espécie está exposta a diferentes tipos de ameaças e pode sinalizar sobre variações e a gravidade desses impactos ao longo do tempo no ecossistema, sendo considerada sentinela ambiental. Este trabalho teve por objetivo discorrer sobre relatos de atividades antrópicas impactantes e doenças infecciosas e parasitárias em C. mydas, com ênfase nas ocorrências no litoral brasileiro. A captura acidental em petrechos de pesca é uma das principais ameaças à conservação desses animais, assim como a ingestão de resíduos sólidos, colisão com embarcações, dragagens e bioacumulação de contaminantes químicos, os quais podem atuar diretament...

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Section: Mortality and Morbidity Of Chelonia Mydas Associated With Humentioning

confidence: 99%

Section: Mortality and Morbidity Of Chelonia Mydas Associated With Humentioning

confidence: 99%

The green turtle Chelonia mydas as a marine and coastal environmental sentinels: anthropogenic activities and diseases

Domiciano

Domit

Bracarense

2017

SCA

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“…Twine diameter may be helpful in some cases where the non-target species could be expected to break free from the twines concerned (NMFS 1998;López-Barrera et al 2012). This approach would be most likely to succeed for larger more powerful animals like marine mammals and some turtles, and less likely to work for birds which are generally closer in weight and swimming strength to the target species.…”

Section: Technical Factorsmentioning

confidence: 99%

“…Martin and Crawford (2015) suggest that a visual approach could be effective for all three taxa, and advocate the use of black and white stripes or squares of around 60mm width in patches inserted among the net meshes like checkered flags, to make the most of the visual acuity of birds, mammals and turtles by providing a contrast in low light conditions. The use of lights on nets also appears to show some promise, notably for birds and turtles, but this has not yet to our knowledge been tested for mammals.…”

Section: Technical Factorsmentioning

confidence: 99%

Disentangling the causes of protected‐species bycatch in gillnet fisheries

Northridge

Coram

Kingston

et al. 2017

Conservation Biology

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Gillnet fisheries are widely thought to pose a conservation threat to many populations of marine mammals, seabirds and turtles. Gillnet fisheries also support a significant proportion of small-scale fishing communities worldwide. Despite a large number of studies on protected species bycatch in recent decades, relatively few have examined the underlying causes of bycatch, and fewer still have looked at the issue from a multi-taxon perspective. We used three bibliographic databases and one search engine to identify studies by year of publication and taxon. The majority of studies on the mechanisms of gillnet bycatch are not This article is protected by copyright. All rights reserved. 2 accessible through mainstream published literature sources. Many are reported in technical papers, government reports and University theses. We reviewed over 600 published and unpublished studies of bycatch where causal or correlative factors were considered, and identified therein 28 environmental, operational, technical and behavioral factors that might plausibly be associated with higher or lower bycatch rates of the three taxa. Of the factors considered, 11 were found to have been associated with potential bycatch reduction in two out of the three taxa, while three factors (water depth, mesh size and net height) were associated with trends in bycatch rate for all three taxa. These findings provide a basis to guide further experimental work to test hypotheses about which factors most influence bycatch rates, and to explore ways of managing fishing activities and/or improving gear design to minimize the incidental capture of species of conservation concern, whilst ensuring the viability of the fisheries concerned.

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“…Typical to this fishery, nets were deployed in the late afternoon, soaked overnight and retrieved the following morning. The soak time ranged from 12 to 24 h (López-Barrera et al, 2012;Ortiz et al, 2016). The target species in this fishery are flounder Paralichthys spp., guitarfish Rhinobatos planiceps and other species of ray from the Batoidea superorder as common stingray Dasyatis spp.…”

Section: Study Area and Data Collectionmentioning

confidence: 99%

Incidental capture of sea turtles in the artisanal gillnet fishery in Sechura Bay, northern Peru

Pingo¹,

Jiménez²,

Alfaro‐Shigueto³

et al. 2017

lajar

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ABSTRACT. Gillnets are recognized globally as one of the fishing gears with the highest levels of bycatch and mortality of sea turtles. Through onboard observer monitoring from July 2013 to June 2014 we assessed the bycatch of sea turtles by an artisanal gillnet fishery operating from Sechura Bay, Peru. One hundred and four sea turtles were incidentally caught in 53 observed fishing sets. The observed species composition of bycatch was green turtle Chelonia mydas (n = 100), hawksbill Eretmochelys imbricata (n = 3) and olive ridley Lepidochelys olivacea (n = 1). Bycatch occurred in 62.3% of monitored sets, with an average of 1.96 turtles caught per set. For all sea turtles combined, 28.8% of individuals were dead and 71.2% were alive at the time of retrieval. The majority of individuals caught were classified as juveniles and sub-adults, with an average carapace length (CCL) of 57.3 ± 0.9 cm for green turtles and 40.2 ± 2.4 cm for hawksbills. The mean annual catch per unit effort (CPUE) of sea turtles was 1.11 ± 0.31 turtles km -1 12 h -1), but varied by seasons. These results suggest that Sechura Bay is an important developmental habitat for juvenile and sub-adult green turtles and hawksbill turtles, but one subject to intense fishing interaction pressure. The development of monitoring programs, local awareness-raising activities, and enhanced management and protection of this critical foraging area and developmental habitat is recommended.

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Incidental capture of green turtle ( Chelonia mydas ) in gillnets of small-scale fisheries in the Paranaguá Bay, Southern Brazil

Cited by 40 publications

References 12 publications

The green turtle Chelonia mydas as a marine and coastal environmental sentinels: anthropogenic activities and diseases

The green turtle Chelonia mydas as a marine and coastal environmental sentinels: anthropogenic activities and diseases

Disentangling the causes of protected‐species bycatch in gillnet fisheries

Incidental capture of sea turtles in the artisanal gillnet fishery in Sechura Bay, northern Peru

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