Friday four guys, only managed 4 Walleye drifting west of N Bass. Looked like good perch marks, so tried that but nothing. Probably mayflies on the bottom? Stopped west of gull shoal where I have done well two times in last week. Super slow. Good marks again but lots of MF carcasses floating. Moved to Kelles Island shoal can. Lots of boats. With engine running ( that was critical). Managed 70 nice ones in about three hours. Fished right next to a very nice bikini. One 13 1/2. Couple 12's. several elevens very few junk. Green or perch color was needed. They were picky.