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According to a recent estimate, most of the turtles caught inadvertently died while capturing tuna, shrimp, squid and other marine life. Researchers believe that accidental capture is the leading cause of death in turtles.
In view of the fact that complete bans on fisheries can seriously jeopardize local economic development, natural resource conservationists have turned to find ways to warn turtles to stay away from fishing nets. Studies have shown that sea turtles can perceive light, even ultraviolet light, throughout the visible spectrum; while many fish have a significant decrease in visual acuity before the ultraviolet range. John Wang, a fishery researcher at the University of Hawaii at Manoa, says: This means we can selectively communicate with sea turtles in the ultraviolet range while avoiding other fish.
Wang and his colleagues teamed up with fishermen in Baja California Sur, Mexico to experiment with reusable, battery-powered UV LEDs in an attempt to deter turtles. They placed an ultraviolet lamp every five meters on the fisherman's thorn net, which reduced the accidental capture or accidental catching of the turtle. Although the lighting network also captures fewer fish, the researchers believe that there is no significant difference in economic value. The team recently published its findings in the Biology Letters.
According to Wang, fishermen were initially reluctant to participate in the study, but they quickly realized that we were not saving turtles at the expense of fisheries. In the long run, this technology will benefit the fishermen. Hoyt Peckham, a visiting scholar at the Stanford University Marine Research Center, said: Turtles are sharp and have a lot of destructive power, so fishermen in some localities or communities have strong incentives to implement programs that reduce sea turtles. Wang added that if possible, when fishermen are capturing fish with commercial needs, they can use LEDs to emit different wavelengths of light to scare away turtles. He plans to conduct experiments in Mexico, Brazil and Indonesia next year.
UV lighting keeps turtles away from fishing nets