Here is my guess. Incubation ranges from 20-22 days, and maturation of ova takes two weeks. Fry are released in shallow waters by females once they have reached a length of 9-10 mm. Adults will spawn within 10 days of going into pond assuming temps ok. Assume adults are used.
April 15 -- adult fish put in
April 25 -- first spawn
May 25 ---- first brood released
June 10 ---- second spawn
July 10 ---- second brood released
July 25 --- third spawn
Aug 25 ---- third brood released
Sept 10 ---- fourth spawn
Oct 10 --- fourth brood released
Oct 25 ---- to late for another batch
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