Walleyes spawn once a year using water temperature and photoperiod (length of day) as cues to spawn. Iowa DNR crews captured 1,910 adult female walleyes at East Okoboji, Rathbun, Spirit, and Storm lakes, as well as the Mississippi River.
Walleyes spawn once a year using water temperature and photoperiod (length of day) as cues to spawn. Iowa DNR crews captured 1,910 adult female walleyes at East Okoboji, Rathbun, Spirit, and Storm lakes, as well as the Mississippi River.