A dropline is a commercial fishing rig consisting of a long fishing line set vertically down into the water, with a series of baited hooks attached to the ends of side-branching secondary lines called snoods.They have a weight at the bottom of the line and are fixed to the water surface at least one float at the top.A concern for marine conservation is that droplines are able to access areas that are otherwise natural fish refuges, such as deep sea canyons and seamounts.There is predation by orcas on commercial longline and dropline fish catches, including around Tasmania,[1] Bering Sea and Prince William Sound areas,[2] causing significant financial loss to commercial fishers, and threat to orcas, which can become caught or entangled, exposed to ship strikes when moving or migrating, or suffer retaliation from fishers.Retaliation in response to predation on fish catches in previous decades has included shooting and harpooning of orcas.