EWEST,
I think I answered a different question? My answer (guess) was based on "how many generations":
First generation: April 1 (original stockers)
Second Generation: May 1 (spawned by original stockers)
Third generation: August 1 (spawned by second generation fish)
Fourth generation: Oct. 1 , (spawned by third generation fish) .
I agree with you that the original stockers(first generation fish) will spawn four times, possibly even five, but my guess was relative to generations. The second generation fish will spawn three possibly four times, the third generation once and possibly twice, but not likely more.
This year, I believe my first spawn was well before May 1. It is very possible I will see a fifth generation fry spawned by a fourth generation fish. Put all this together in a tree structure and one can see that you end up with thousands and thousands of fish...just what we want!