Bottom trawling is a type of deep-sea fishing that involves dragging a large net along the bottom of the ocean, and it results in catching and killing many unintended species, some of which are endangered  Environmental advocates, concerned for these endangered marine species, have recommended that commercial fishers use a new set of nets, each designed specifically for the size and shape and pheromones (chemical attractors) of an individual marine species targeted by the commercial fishers
Environmentalists hope use of these new nets will protect the endangered marine species without interrupting commercial deep-sea fishing
The pheromones that would most attract the species sought by commercial fishers indicate the presence of a dangerous threat to most of the endangered marine species