I found this old thread which seemed to be a logical place to ask another question on GSH. Do they only spawn once during a season? If so, what water temp or month in N. Illinois? I have a small population but I want to stock some more this spring. I would like to get them in before they spawn to improve the chances of establishing a larger sustainable population. I have a significant amount of under water vegetation for cover and spawning already.
Researching this, I find GSH can spawn 3-4 times in northern climates and as many as 7-8 times in their southern range.
In your location 5 wouldn't be out of the question if habitat conditions are proper. As with any species, whether you see recruitment or not is based on many factors.
Edit: Looks like spawning can occur in/near mid 60's up. It may tapper off in extreme heat I would guess.
