Summary
Four commercially available pingers (AIRMAR, Aquamark 100, Fumunda, Save Wave Saver) were tested on vessels operating in Cornwall targeting hake (Merluccius merluccius) with gillnets. Pingers were tested for their effectiveness at reducing incidental interactions between the gillnets and porpoises (Phocoena phocoena). Only one of the four tested pingers, AIRMAR, performed 'satisfactorily' (i.e. suited for offshore gillnet fishery).