Canada has also instituted a ban on discarding at sea in its Atlantic groundfish fishery that makes it illegal to return to the water any groundfish except those specifically authorised and those caught in cod traps.
Midwater trawling catches pelagic fish such as anchovies, shrimp, tuna and mackerel, whereas bottom trawling targets both bottom living fish (groundfish) and semi-pelagic fish such as: cod, squid, halibut and rockfish.