1) Bottom-fishes 2) Casts a wide net 3) Dragnets 4) Drags the bottom 5) Fishes for flounder 6) Fishes for orange roughy 7) Fishes with a dragnet 8) Fishes with a net 9) Fishing nets 10) Seine relatives 11) Strong fishing nets 12) Sweeps the sea clean Found on https://www.crosswordclues.com/clue/trawls