Too many forage fish is usually not a problem. Abundant forage fish usually creates a quality fishery. Your LMB should be thriving with extra forage available. If you want to remove fish of a specific size look into buying a relatively short small mesh gill net maybe 1/2"-1" mesh or a larger sized fish trap such as cloverleaf or Z trap. Fish the gill net perpendicular to shore. All fish caught in the gill net will be dead or going to die after removing them from the net. There are some net companies that sell monofilament gill nets.