Canadian commercial netters having difficulty catching walleye

Went up to our lake house this weekend. Talked to neighbor and he tells me he went over to Port Clinton fisheries to buy some fish.Bought 4 lbs of yellow perch but tells him has no walleye to sell.I think that's odd that walleye capital has no walleye to sell.Go to jolly Roger today to bring dinner home to family.Talk to Mike the manager I know there.He tells me his supplier told him he is having difficulty getting enough walleye to sell to his customers lately.Now, I have been reading of all the great walleye fishing from Catawba to Ashtabula for the last couple months.But the Canadian netters are not catching enough walleye now.With the string of great hatches and great fishing in US waters what could that mean.Is it a one time weather event causing the fish to migrate differently? I know the cold windy spring kept water temps unusually cold this spring,then water warmed rapidly since start of summer.Or could the decades of huge walleye harvests on the Canadian side depleted the stock of fish that instinctively migrated through the Canadian waters? Interesting to hear what their biologists say and what plays out.