I remember for a lot of years in the 60's and 70's there was a big commercial fishing boat ( netter) that was at the public dock by Kennedy's, I am sure that had an effect? I didn't see it there in the 80's as I recall.
Opening of the walleye season and late fall used to be about the only time you saw walleyes being caught, it was a rough go any other time, although for me it changed in the mid 80's, I got them during mid summer when I bothered to fish for them.
My dad and one of my uncles went to PAB for the opener in the 60's, my uncle got 3 walleye all week, dad got the skunk, but my uncles 3 walleye went around 25 pounds, one was around 10 3/4 pounds. They were around but limited numbers? and concentrated pre and post spawn?