Developing ultraviolet illumination of gillnets as a method to reduce sea turtle bycatch

Wang, John; Barkan, Joel; Fisler, Shara; Godínez‐Reyes, Carlos R.; Swimmer, Yonat

doi:10.1098/rsbl.2013.0383

Cited by 83 publications

(69 citation statements)

References 17 publications

(48 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Our results indicate that Sechura Bay is an important foraging area and developmental habitat for green turtles and also possibly for critically endangered hawksbill turtles. This research found that a majority of sets having bycatch, given these catch rates; we recommend the identification and implementation of mitigation measures to reduce sea turtle bycatch, like illuminating nets with LED lights, shark silhouettes and use float lines without buoys (Gilman et al, 2010;Wang et al, 2010Wang et al, , 2013Ortiz et al 2016). To help maximize their uptake and effectiveness, such efforts to identify solutions should involve small-scale 611 Incidental capture of sea turtles in Sechura Bay, Peru 7 fishermen as well as scientists and other stakeholders and decision-makers.…”

Section: Conclusion and Recommendationsmentioning

confidence: 80%

“…Sea turtle bycatch per unit effort (CPUE) was determined as: CPUE = number of turtles captured / (net length [km]) × (soak time of net [12 h]) (Wang et al, 2013). Gillnet bycatch data for the study was grouped by month in order to derive monthly stratified CPUE estimates.…”

Section: Discussionmentioning

confidence: 99%

“…Among these, gillnet fisheries may be the single largest threat to sea turtle populations (Gilman et al, 2010;Wallace et al, 2010). In Peru, gillnets were reported as the main source of turtle mortalities in artisanal fisheries from 1986 to 1999 (Estrella & GuevaraCarrasco, 1998a, 1998bEstrella et al, 1999aEstrella et al, , 1999b and have been the focus of attention in recent years Wang et al, 2013;Ortiz et al, 2016). Our results suggest that gillnets are an important source of bycatch and mortality of sea turtles in Sechura Bay, being a threat to the sea turtles populations in this important foraging and developmental habitat (de Paz & Alfaro-Shigueto, 2008;Santillán, 2008).…”

Section: Sea Turtle Catch Ratesmentioning

confidence: 99%

“…While net modifications have, in some cases, resulted in megafauna bycatch mitigation in certain fisheries without substantial reductions in target catch, mitigating net bycatch has proven challenging because nets are inherently nonselective (Peckham et al, 2015& Gilman et al, 2010. However, recent research, conducted in-part in the Constante demersal set-net fishery, suggests that sea turtle bycatch in gillnets could be reduced through illuminating nets (Wang et al, 2013& Ortiz et al, 2016.…”

Section: Chelonia Mydas Eretmochelys Imbricatamentioning

confidence: 99%

See 3 more Smart Citations

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

Pingo¹,

Jiménez²,

Alfaro‐Shigueto³

et al. 2017

lajar

View full text Add to dashboard Cite

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.

show abstract

Section: Conclusion and Recommendationsmentioning

confidence: 80%

Section: Discussionmentioning

confidence: 99%

Section: Sea Turtle Catch Ratesmentioning

confidence: 99%

Section: Chelonia Mydas Eretmochelys Imbricatamentioning

confidence: 99%

See 2 more Smart Citations

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

Pingo¹,

Jiménez²,

Alfaro‐Shigueto³

et al. 2017

lajar

View full text Add to dashboard Cite

show abstract

“…Perbandingan hasil tangkapan bycatch penyu dan tangkapan HTU dihitung berdasarkan catch per unit effort (CPUE). CPUE merupakan nilai estimasi laju tangkapan setiap ulangan dibagi dengan tingkat upaya yang telah distandarisasi, setiap panjang jaring 1 km dan waktu perendaman 12 jam atau (km x 12 jam) -1 (Wang et al 2013). Hal ini digunakan agar perbandingan antara gillnet kontrol dan gillnet eksperimen dalam upaya yang sama.…”

Section: Analisis Pengaruh Penggunaan Lampu Led Hijau Terhadap Bycatcunclassified

LIGHT EMITTING DIODE (LED) HIJAU DAN PENGARUHNYA TERHADAP PENGURANGAN BYCATCH PENYU PADA PERIKANAN GILLNET DI PERAIRAN PALOH (Green Light Emitting Diode (LED) and its Effect on Sea Turtle Bycatch Reduction of Gillnet Fisheries in Paloh Waters)

Prasetyo¹,

Wahju²,

Yusfiandayani³

et al. 2017

Jurnal Marfis

View full text Add to dashboard Cite

Bycatch problem is a global issue and can be a driver of marine megafauna declines in the world, such as sea turtle, where is the animal's status as endangered species. Green Light Emitting ABSTRAKPermasalahan terkait bycatch merupakan isu utama global yang dapat mengancam penurunan populasi megafauna laut seperti penyu yang telah berstatus endangerd species. Lampu LED merupakan inovasi teknologi untuk mengurangi bycatch penyu tanpa mengurangi hasil tangkapan ikan utama secara efektif. Penggunaan lampu Light Emmitting Diode (LED) hijau untuk mengurangi bycatch penyu pada perikanan jaring insang (gillnet) dilakukan di perairan Paloh, Kalimantan Barat selama bulan Agustus hingga Oktober 2015. Uji coba dilakukan dengan menggunakan 2 unit kapal gillnet yang dioperasikan di setiap stasiun pengamatan secara bersamaan dengan jumlah ulangan sebanyak 20 kali, diantaranya gillnet kontrol (tanpa lampu LED) dan gillnet eksperimen (dengan lampu LED). Penyu yang tertangkap cenderung didominasi oleh fase juvenile sebesar 57,14% dan lokasi potensi tertangkapnya bycatch penyu pada stasiun 2 (1˚52' -1˚56' LU dan 109˚14' -109˚18' BT). Hasil penelitian menunjukkan bahwa penyu yang tertangkap merupakan penyu hijau (Chelonia mydas) berjumlah 7 ekor, terdiri dari 6 ekor tertangkap pada gillnet kontrol dengan CPUE 0,29 ± 0,03 ekor/E, dan 1 ekor pada gillnet

show abstract

Sea turtles bycatch in the Adriatic Sea set net fisheries and possible hot‐spot identification

Lucchetti

Vasapollo

Virgili

2017

Aquatic Conservation

View full text Add to dashboard Cite

Bycatch resulting from fishing activities is the main threat for the conservation of sea turtles in the Mediterranean Sea. Fixed nets are a matter of concern for sea turtles mainly in coastal areas during the neritic stage when both juvenile and adult life stages are affected. Mortality caused by entanglement in set nets is related to forced apnoea due to the high soak time of the nets and consequent drowning. This study investigated the loggerhead turtle bycatch in set net coastal fisheries in the northern Adriatic Sea (General Fisheries Commission for the Mediterranean Geographical Sub‐Area 17, [GSA 17]) through an interview‐based approach, to understand the potential contribution of these fisheries to the general decline of the sea turtle population. A second goal was to identify a possible hot‐spot turtle bycatch area through on‐board observations. The study estimates that more than 5400 turtles are caught in the west GSA 17 each year with the largest number in the summer. A hot‐spot for entanglement was also identified in an area located south of the River Po delta (41.5–69 m depth) during the summer. Sixty‐four turtles were caught over a period of 30 fishing days by either trammel nets and gillnets (0.7 and 0.5 turtle per km of net respectively) and was the greatest number that has been observed anywhere in the Mediterranean. Possible management strategies to reduce bycatch include technical modification to gear setting (such as reducing netting slack and using small meshes), bycatch reducer devices (such as LED UV), and area and seasonal gear restrictions to small‐scale fisheries in areas of greatest concern in the northern Adriatic Sea.

show abstract

Developing ultraviolet illumination of gillnets as a method to reduce sea turtle bycatch

Cited by 83 publications

References 17 publications

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

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

LIGHT EMITTING DIODE (LED) HIJAU DAN PENGARUHNYA TERHADAP PENGURANGAN BYCATCH PENYU PADA PERIKANAN GILLNET DI PERAIRAN PALOH (Green Light Emitting Diode (LED) and its Effect on Sea Turtle Bycatch Reduction of Gillnet Fisheries in Paloh Waters)

Sea turtles bycatch in the Adriatic Sea set net fisheries and possible hot‐spot identification

Contact Info

Product

Resources

About