By tapping into a nails-on-a-chalkboard-like reflex, scientists are hopeful they’ve found a way to keep seals away from endangered fish. (via hakaimagazine)
Each summer at the Ballard Locks near Seattle, Washington, thousands of tourists gather to watch steelhead trout and coho, sockeye, and chinook salmon valiantly leap up the fish ladder as they head from Puget Sound to Lake Washington and the spawning grounds beyond. So, too, do a handful of hungry seals and sea lions.
“The big challenge,” says Andrew Trites, a pinniped researcher at the University of British Columbia, “is you’re trying to stop [pinnipeds] from doing something that [has] such a positive reward, which is getting to eat. Food is the ultimate payoff, and that’s why it’s been a near impossible thing to stop.”
The TAST represents an exciting new advancement in pinniped deterrents because it takes advantage of something called the acoustic startle reflex, says Thomas Götz, a marine mammal researcher at the University of St Andrews in Scotland who co-created the technology. “If a sound has certain properties, then it triggers a muscle contraction—a flinch,” he says. For pinnipeds, he explains, the noise is like fingernails on a chalkboard.
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