Thanks jeffhasapond, more peices to the puzzle.

I'm curious about the idea that GSF only spawn once a year. Is the same true of any other Sunfish? Your experience must have some significance, but I'd like to know more. For example, are there possibly some unusual circumstances that can cause GSF to spawn multiple times in a season? I think it's established that many fish will adjust their spawning behavior to environmental influences. Maybe if they were the apex predator in a pond they would spawn more often.

At this time my focus is on a Greenie pond without larger predators.

Shorty, I'm really hoping that you can gather some data from your neighbor with the GSF pond. It would be great if he used the internet and would join the forum and discuss his pond.