Walleye production in the Hawkeye State starts with planning and hard work. The result is one of the best-stocked states in the union.
Once the fish are collected, they are separated into male and female groups to determine which fish are ready to spawn.
Check out the difference between a 'ripe' female, and a 'green' one and what biologists do with the different fish.
Here's the video:
"The Rathbun Hatchery is open year-round Monday through Friday, 7:45 a.m. to 3:45 p.m. Small groups are self-guided. Large groups must call ahead (641-647-2406) to make an appointment. The hatchery is located in Appanoose County about seven miles north of Centerville on road J5T (15053 Hatchery Place, Moravia, IA)."