Think about where you are fishing before you decide whether to keep your limit. Just because you can doesn't mean you have to.
Are you fishing up north in a relatively low "fishing pressure" lake or one that is stocked annually? Go ahead and keep your limit, I know I do.
Are you fishing within an hour of the GTA? Think about the future of fishing for your son and his son/daughter and so on. Maybe keep the smaller ones if you insist and let the spawn size ones go.
This goes for all species, research what spawning size is for the species you are after and just keep that in mind. Respect the fisheries and we can all enjoy them for years to come.