During March and April of 1953 and 1954 walleyes were tagged and released in Muskegon Lake before they ascended the Muskegon River on a spawning migration. Recoveries of the tagged walleyes were made by dip nets below Newaygo Dam 39 miles upstream. Estimates of the numerical abundance of the spawning runs computed from these recaptures (ratio of tagged to untagged walleyes in the dip-net catch) were about 114,000 individuals in 1953 and about 139,000 fish in 1954.