· pingers (small sound-emitting and dolphin-deterring devices that are attached to fishing nets) and escape hatches (consisting of a widely spaced metal grid, which force the cetacean up and out of the net).
· pingers (small sound-emitting and dolphin-deterring devices that are attached to fishing nets) and escape hatches (consisting of a widely spaced metal grid, which force the cetacean up and out of the net).