Are you sure this is why kings aren’t stocked?
My understanding is MN and WI don’t stock superior with kings anymore because of the cost to do so. I did not think it had anything to do with them being a threat to the lake trout populations. Between the smelt and herring I think there is plenty of forage to support lots of stocked kings without hurting the lake trout population. The lake has a good population of coho but I haven’t heard of that being an issue for the lake trout. Not sure why kings would either.
I believe WI still stocks some kings in superior. It’s just a lot less than they stock MI. Maybe they quit stocking them recently?
We caught a baby king in the islands last spring. That would have been a long swim from Canada for the little guy.
It’s not that they are a threat to the lake trout, it’s that they can’t compete and sustain themselves because the lake can’t support that much forage. Also a reason why they don’t get that big in Superior… not enough food to get 20-30lbs before their death run. The salmon that are there now is the max carrying capacity the lake can sustain. There’s some natural reproduction and that is the best it will get for the salmon unless the lakers die off again like they did from the lamprey years ago. The DNR continually stocking salmon is a complete waste of money and is essentially doing nothing more than feeding the lake trout a bonus buffet offering. Same thing with the loopers, hence why they tried to grow them bigger before stocking them, which became another limiting factor leading to their demise.
WI quit stocking them as well, I think around the same time MN did. Like B-Man said, Ontario still may dump some in up there, but I don’t think it’s a lot. They must feel that they have enough navigable streams to provide good spawning habitat up there?