I know one guy who feeds walleyes live fatheads to get them to grow. He feeds 4lbs of fatheads for each pound of walleye. This is enough food to turn a .75lb walleye into a 2.5lb walleye in 120 days, or one summer.

If your walleye are happy and healthy the earliest the femals could spawn would be four yrs old. More likely 5 for females and 4 for males. Fish may not spawn untill 6 yrs if growth is moderate to slow.

Reproduction can be hampered by over abundant BG because of competition for zooplankton.

You may be better off buying more walleyes than to count on successful spawning.

Where did you get your fish?
Have you ever heard of oswald fisheries?