Ontario Fishery Regulations, 2007

23 (1) A person who is angling under a sport fishing licence or a conservation fishing licence from a fishing vessel and who catches largemouth bass, smallmouth bass, walleye or northern pike may exchange one or more of the live fish that the person has caught for another of the same species if

• (a) the live fish that are caught and not immediately released are held in a livewell that is mechanically aerated at all times; and

• (b) the fish that is being released will survive after release and is released into the waters from which it was caught.

(2) A person who is fishing under a sport fishing licence may hold in the livewell no more than an aggregate of six largemouth bass or smallmouth bass.