Here is another article from SD State that I found while wondering this same thing yesterday, I was hoping my recently stocked bluegills will pull of a spawn this year

https://www.sdstate.edu/nrm/outreach/pon...ctober-2007.pdf

Another question for the fish biologists, if bluegill are introduced to a new waterbody could that trigger an additional spawn? From the article above it appears that existing population affects multiple spawns. I wonder if in a freshly stocked pond new stockers pull off multiple spawns for this reason and as the population grows the fish spawn less times in a year. Could also be the same in a bass heavy pond where most offspring are eaten triggering multiple spawns by the same fish. If there is room they will fill it!