Food color and marine turtle feeding behavior: Can blue bait reduce turtle bycatch in commercial fisheries?

Swimmer, Yonat; Arauz, Rándall; Higgins, B.J.; McNaughton, Lianne; McCracken, Marti L.; Ballestero, Jorge; Brill, Richard W.

doi:10.3354/meps295273

Cited by 57 publications

(56 citation statements)

References 8 publications

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“…Ecological variables have been neglected in previous studies of loggerhead by-catch (e.g. Swimmer et al 2005, Watson et al 2005, Gilman et al 2006. For pelagic longline fisheries in the oceans, variables such as fishing-ground depth, distance to upwellings, or distance to the surface currents should be evaluated.…”

Section: -999 Nmmentioning

confidence: 99%

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Loggerhead turtle by-catch depends on distance to the coast, independent of fishing effort: implications for conservation and fisheries management

Báez¹,

Real²,

García-Soto³

et al. 2007

Mar. Ecol. Prog. Ser.

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Drifting longline is considered one of the most dangerous fishing gears for marine turtles and is their principal threat in the western Mediterranean Sea. During the summers of 2000 to 2003, 179 fishing operations were observed onboard a traditional Spanish drifting longline boat in the Balearic Sea (western Mediterranean) to analyse the effects of fishing effort and ecogeographical factors on the by-catch of loggerhead turtles Caretta caretta. We observed 4074 swordfish captured and 675 loggerhead turtles by-caught. The probability of catching at least 1 loggerhead was related to the distance of the fishing-ground to the coast and, to a lesser extent, depth, both independent of fishing effort. The average number of loggerheads captured was spatially structured only according to mean distance to the coast. However, the number of swordfish captured was correlated with fishing effort but was not correlated with distance to the coast or depth. Distance to the coast was correlated with gear retrieval time, sea surface temperature and velocity, and phytoplankton concentration. As the number of loggerheads captured was independent of the number of hooks, the number of fishing operations was a better unit than the number of hooks to assess loggerhead by-catch. Limiting drifting longline fishing activity to within 35 international nautical miles from the coast could reduce loggerhead by-catch substantially without affecting swordfish captures and with little resistance from fishermen.KEY WORDS: By-catch · Drifting longline · Sea turtle · Loggerhead · Caretta caretta · South-western Mediterranean · Swordfish fishery Resale or republication not permitted without written consent of the publisher

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Section: -999 Nmmentioning

confidence: 99%

“…Swimmer et al 2005, Watson et al 2005. Some of these studies recommended the use of chub mackerel and circular hooks, which is not accepted by Spanish fishermen , as their use is considered to diminish yields of target species (Gilman et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Loggerhead turtle by-catch depends on distance to the coast, independent of fishing effort: implications for conservation and fisheries management

Báez¹,

Real²,

García-Soto³

et al. 2007

Mar. Ecol. Prog. Ser.

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“…Penggunaan alat bantu tersebut berdasarkan pada pengetahuan tentang kemampuan penglihatan dan tingkah laku penyu pada aktivitas penangkapan ikan (Southwood et al 2008;Bartol et al 2002;Swimmer et al 2005;Lohmann et al 2008;Schuyler et al 2014). Beberapa penelitan dalam upaya mengurangi bycatch penyu pada alat tangkap gillnet dengan memanfaatkan kemampuan penglihatan penyu telah banyak dilakukan, seperti penggunaan lampu tanda (marker light) cahaya putih (broader spectrum white) (Gilman et al 2010), penggunaan hiu buatan (shark shape) , penggunaan lightstick dan lampu 2013;Ortiz et al 2016), namun hanya teknik penggunaan lampu pada jaring (net illumination) yang dapat mengurangi bycatch penyu tanpa mengurangi hasil tangkapan ikan target catch (Gilman et al 2010).…”

Section: Pendahuluanunclassified

“…Permasalahan tertangkapnya penyu pada alat penangkap ikan, seperti gillnet disebabkan pengoperasian di wilayah jalur migrasi penyu (Lewison et al 2004;Crowder dan Murawski 1998). Ikan yang terjerat pada gillnet selama pengoperasian juga dapat menarik perhatian penyu mendekati alat tangkap untuk memakan ikan tersebut, sehingga penyu terjerat bersama ikan pada alat tangkap tersebut (Witzell 1999;Swimmer et al 2005).…”

Section: Pembahasanunclassified

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

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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

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“…Fewer loggerheads are caught when soak time during the day is reduced (Bolten & Bjorndal 2003, Watson et al 2005. Both loggerheads and leatherbacks might be induced to search for food in the vicinity of longlines by bait odors, by visual stimuli from the gear, or by both variables (Swimmer et al 2005). Experiments with juvenile loggerheads in large enclosures have shown that the turtles are attracted to longline floats and to the shiny snaps used to attach gangions to the mainline (Hataway & Mitchell 2001).…”

Section: Factors Affecting Marine Turtle Bycatch On Longlinesmentioning

confidence: 99%

Behavioral responses of juvenile leatherbacks Dermochelys coriacea to lights used in the longline fishery

Gless¹,

Salmon²,

Wyneken³

2008

Endang. Species Res.

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Sea turtles are injured and sometimes killed because of interactions with pelagic longlines, such as hook ingestion, entanglement in the lines, and forced submergence. Stimuli from bait, gear and lights (often used at night on swordfish lines) might attract sea turtles. Previous experiments with loggerheads Caretta caretta demonstrated that the turtles were attracted to the lights, but no comparable studies have been done with other species. Our goal in this study was to determine whether juvenile leatherbacks Dermochelys coriacea, reared in the laboratory for 5 to 42 d postemergence, responded to the lights in the same way as loggerheads. Each leatherback was presented once in varying order with 3 different colored light stimuli from either chemical lightsticks (n = 16 turtles) or battery powered LEDs (n = 16 turtles) commonly used in the fishery. Most leatherbacks, in contrast to loggerheads, either failed to orient or oriented at an angle away from the lights. These results imply that the capture of leatherbacks on longlines might occur for other reasons (by accident, through attraction to bait odor or to concentrations of natural prey located near the lines). Alternatively, older turtles might show responses that differ from those of juvenile turtles. We review previous studies based upon logbook data and conclude that because of confounding factors, there is no convincing evidence that marine turtles are attracted to the longlines by lights. We recommend that better-designed field experiments be carried out to determine whether fishery lights have an effect on marine turtle capture rates.

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Food color and marine turtle feeding behavior: Can blue bait reduce turtle bycatch in commercial fisheries?

Cited by 57 publications

References 8 publications

Loggerhead turtle by-catch depends on distance to the coast, independent of fishing effort: implications for conservation and fisheries management

Loggerhead turtle by-catch depends on distance to the coast, independent of fishing effort: implications for conservation and fisheries management

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)

Behavioral responses of juvenile leatherbacks Dermochelys coriacea to lights used in the longline fishery

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