Lighten up using artificial light to improve the capture efficiency of fishing gears
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Lighten up using artificial light to improve the capture efficiency of fishing gears
Lighten Up: Using Artificial Light to Improve the Capture Efficiency of Fishing Gearsby © Khanh Q. NguyenA thesis submitted to the School of Graduate Lighten up using artificial light to improve the capture efficiency of fishing gears Studies in partial fulfillment of the requirements for the degree ofDoctor of PhilosophyEnvironmental Science ProgrammeFaculty of ScienceMemorial University of NewfoundlandApril, 2019St. John's. Newfoundland and Labrador>itABSTRACTSnow crab {Chionoecetes opiho) is an important commercial shellfish Lighten up using artificial light to improve the capture efficiency of fishing gears and one of the most valuable fisheries in eastern Canada. The Newfoundland and Labrador snow crab fishery has been the world's largest for the past twLighten up using artificial light to improve the capture efficiency of fishing gears
o decades. Total landings grew substantially between the 1980s and 1990s, but more recently, the industry has been faced with new challenges includingLighten Up: Using Artificial Light to Improve the Capture Efficiency of Fishing Gearsby © Khanh Q. NguyenA thesis submitted to the School of Graduate Lighten up using artificial light to improve the capture efficiency of fishing gears h shrimp trawlers, effects of seismic exploration, and increases in operating costs. Maintaining the economic viability of small fishing businesses in the presence of these new stressors can be a challenge. In output-controlled fisheries such as snow crab, improving the catch rate of existing traps Lighten up using artificial light to improve the capture efficiency of fishing gears is an effective method of impros ing the financial viability of small fishing businesses. In this thesis. I conducted a comprehensive examination of tLighten up using artificial light to improve the capture efficiency of fishing gears
he behaviour of snow crab in response to artificial light (i.c.. Lighl-Lmilling Diode (LLD) lights and luminescent netting), including laboratory and Lighten Up: Using Artificial Light to Improve the Capture Efficiency of Fishing Gearsby © Khanh Q. NguyenA thesis submitted to the School of Graduate Lighten up using artificial light to improve the capture efficiency of fishing gears lantic Ocean.First. 1 conducted a literature review regarding the use of artificial light in commercial industrialized fisheries. The review provides valuable knowledge and reference for scientists, managers, and fishermen on animal behaviour in response to artificial light. It also addresses the tr Lighten up using artificial light to improve the capture efficiency of fishing gears ade-off between positive effects such as increased catch rate and reduced bycatch with negative effects such as the production of increased plastic, oLighten up using artificial light to improve the capture efficiency of fishing gears
cean litter, and greenhouse gas emission. Second. 1 conducted 7Iexperiments to investigate the behaviour of snow crab in response to artificial light,Lighten Up: Using Artificial Light to Improve the Capture Efficiency of Fishing Gearsby © Khanh Q. NguyenA thesis submitted to the School of Graduate Lighten up using artificial light to improve the capture efficiency of fishing gears oratory experiments indicated that snow crab responded differently to different light colours. Field experiments in 2016 demonstrated that equipping baited traps with small low-powered LED lights increased the Catch Per Unit Effort (CPLE; number of crab per pot) of the traps (i.e.. 77% and 47% for w Lighten up using artificial light to improve the capture efficiency of fishing gears hite and purple I.FD lights, respectively). Next. I examined the effect of installing underwater LED lights in different locations and orientations inLighten up using artificial light to improve the capture efficiency of fishing gears
side baited traps targeting snow crab off the coast of Newfoundland and Labrador, Canada. Results from this field experiment in 2017 revealed that theLighten Up: Using Artificial Light to Improve the Capture Efficiency of Fishing Gearsby © Khanh Q. NguyenA thesis submitted to the School of Graduate Lighten up using artificial light to improve the capture efficiency of fishing gears ssel targeting snow crab in the Barents Sea, off the coast of Norway. Results revealed that equipping bailed traps with purple lights increased the CPI E by 11.6%. although the results varied with the density of crab.Finally. 1 examined the potential application of luminescent netting as a source of Lighten up using artificial light to improve the capture efficiency of fishing gears artificial light to determine whether it could be used to improve the CPUF. of traps. A benchlop laboratory experiment was conducted lo measure the dLighten up using artificial light to improve the capture efficiency of fishing gears
uration of luminescence using time-lapse photography. I found that luminescent netting can be activated to emit light and that the resulting intensityLighten Up: Using Artificial Light to Improve the Capture Efficiency of Fishing Gearsby © Khanh Q. NguyenA thesis submitted to the School of Graduate Lighten up using artificial light to improve the capture efficiency of fishing gears in 2018 showed that luminescent traps significantly increased the catch rate of snow crab compared to traditional traps.11Overall, the results of my PhD research demonstrate that artificial light can improve the catch rates of snow crab traps, with examples from different light sources (i.e.. LED li Lighten up using artificial light to improve the capture efficiency of fishing gears ght, luminescent netting) and locations (Barents Sea. Newfoundland and Labrador). These results suggest that the application of artificial light in coLighten up using artificial light to improve the capture efficiency of fishing gears
mmercial snow crab fisheries could improve the financial viability of fishing enterprises.IllACKNOWLEDGEMENTSI was fortunate to receive many helps andLighten Up: Using Artificial Light to Improve the Capture Efficiency of Fishing Gearsby © Khanh Q. NguyenA thesis submitted to the School of Graduate Lighten up using artificial light to improve the capture efficiency of fishing gears to offer my sincerest thank you to my academic supervisor Dr. Paul Winger al the Fisheries and Marine Institute for his incredible mentorship, excellent guidance, and constant support throughout my degree. Dr. Paul Winger has supported me from the first days when I stalled looking for funding and a Lighten up using artificial light to improve the capture efficiency of fishing gears pplied to the PhD program al Memorial University of Newfoundland. 1 would never have been able to start or finish this thesis without him. Ĩ have learLighten up using artificial light to improve the capture efficiency of fishing gears
ned a lot from him. 11 is not only his academic knowledge that he has provided, bill he has also modelled an exemplary style of livmg. 1 do believe thLighten Up: Using Artificial Light to Improve the Capture Efficiency of Fishing Gearsby © Khanh Q. NguyenA thesis submitted to the School of Graduate Lighten up using artificial light to improve the capture efficiency of fishing gears heir kind support and great friendship from the first days when 1 arrived in St. John’s. Ĩ would like to acknowledge the rest of my academic supervisory committee including Dr. Corey Morris al lhe Fisheries and Ocean Canada. Drs. Scott Gram and Shannon Baysc al the Centre for Sustainable Aquatic Res Lighten up using artificial light to improve the capture efficiency of fishing gears ources for their valuable guidance, consultation, advice and support during my thesis. I also would like to express my great gratitude lo all of lhe lLighten up using artificial light to improve the capture efficiency of fishing gears
ecturers in the environmental Science program at Memorial University of Newfoundland for their teaching and support. The knowledge that 1 leamt from tLighten Up: Using Artificial Light to Improve the Capture Efficiency of Fishing Gearsby © Khanh Q. NguyenA thesis submitted to the School of Graduate Lighten up using artificial light to improve the capture efficiency of fishing gears for their kind assistance on various projects and then-overall good nature and friendliness. I could not have asked for a better environmentIVfor enabling me to achieve my research goals as a graduate student. Everybody there has given me kindness and warm friendship. 1 wish to express my sincere th Lighten up using artificial light to improve the capture efficiency of fishing gears anks to Kelly Moret for her great support, encouragement, and priceless help, and to Claudene Hartery for valuable secretarial support. I heartily thaLighten up using artificial light to improve the capture efficiency of fishing gears
nk Gail Kenny and Nancy Bishop, the administrative staff in the interdisciplinary Program Office for their guidance. Many thanks to my fellow graduateLighten Up: Using Artificial Light to Improve the Capture Efficiency of Fishing Gearsby © Khanh Q. NguyenA thesis submitted to the School of Graduate Lighten up using artificial light to improve the capture efficiency of fishing gears ledge my colleague Truong Nguyen and his family for the kind welcome, warm friendship, and invaluable support over the last few years in Canada. To other individuals who assisted me and made contributions along the way. Ĩ deeply appreciate your time, effort and understanding, most of whom 1 have cho Lighten up using artificial light to improve the capture efficiency of fishing gears sen to mention al the end of each chapter.Ĩ also wish to acknowledge fisher partners Bernard Chafe - captain of the F'V The Phoenix, Gerard Chidlcy -Lighten up using artificial light to improve the capture efficiency of fishing gears
captain of the F/V Atlantic Champion, Bob Parsons -captain of the F/VFỈat Rock Ryes, Karl Olav - captain of MS Tromsbas, Elmer Jensen - captain of theLighten Up: Using Artificial Light to Improve the Capture Efficiency of Fishing Gearsby © Khanh Q. NguyenA thesis submitted to the School of Graduate Lighten up using artificial light to improve the capture efficiency of fishing gears ance and hospitality while out at sea.Financial support for my stipend was provided by Vietnam International Education Development (VIED) and Memorial University. Funding for my research activities, travel to conferences, and publications costs were provided by the Fisheries and Marine Institute of Lighten up using artificial light to improve the capture efficiency of fishing gears Memorial University, the Research Council of NorwayVLighten Up: Using Artificial Light to Improve the Capture Efficiency of Fishing Gearsby © Khanh Q. NguyenA thesis submitted to the School of GraduateGọi ngay
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