Personally, the only way to protect the trout lakes would be to designate then as artifical lures only, but without an increased CO enforcement it's unlikely such a designation would adhered to.
Just a reminder of the regulations:
Bait-fish
In most areas of Ontario, only the following fish may be used
as bait:
• Minnow family (except carp, goldfish, cutlip minnow, redside
dace, lake chubsucker, and gravel chub)
• Mudminnows, white sucker, sticklebacks, darters (except
eastern sand darter), trout-perch and sculpins
• Lake herring
• Crayfish.
Release of Bait
Anglers must NOT release live bait into waters other than the
waterbody where the bait was originally captured.
Moving Live Fish
Many new populations of non-native fish species have
been established through unauthorized stocking or
release. This practice is illegal and can cause great harm
to existing fisheries and aquatic ecosystems.