Making waves: Sound waves are a non-lethal way to deter seals, but there is a debate over their use

摘要

It'S a simple question fish farmers face: how do you keep the salmon in Hand predators such as seals out?The solutions, however, are many and complex, each with their own advantages and disadvantages that have to be weighed up carefully against harm, cost and other factors.New net and scarer technologies are being developed all the time, all claiming to offer answers, and new research papers have to be kept on top of. All the while two drivers continue relentlessly: consumer demand for salmon and the natural cycles of predator and prey.Seals can each eat 3-7kg (6.5—15.41b) of food per day, depending on the species. Holes bitten through nets have let hundreds of thousands of farmed fish escape into the wild.