Bycatch reduction devices (BRDs) are tools designed to minimize unintended capture of marine animals and reduce the adverse environmental impacts of fishing. Over 7 million metric tons of bycatch are discarded each year, including non-target fish, turtles, corals, and other species. BRDs work by separating catch by size using grids or panels to guide bycatch out of escape openings, or by exploiting behavioral differences between target and bycatch species to allow the latter to orient and swim to freedom. Properly implementing BRDs can help ensure ecosystem diversity and integrity while protecting juvenile fish stocks.