4Corners has good points. Abundant GSF can heavily reduce recruitment of LMB by eating eggs and fry. GSF have big mouths to eat big things for the fish's size. GSF are aggressive. I deal with GSF in a YP test feeding small pond. GSF like to hide in shallow shoreline habitats often making it hard for predators to capture them. GSF can be prolific and thrive living in rocky shoreline areas. For me GSF will readily enter unbaited minnow traps and fish traps with larger funnel openings. I can easily get 15-30 in each trap set. I'm trapping them daily now with lots of YOY GSF in the traps.. Strongly reduce GSF numbers before adding LMB unless you can add LMB big enough to right away eating GSF. But without strongly reducing the GSF the GSF will hinder reproduction success of LMB by eating eggs and fry. Walleye in my experience are not good predaors of GSF.