GW thanks. That is what this forum is all about. I have some bits and pieces.

You note a very good point - that small ponds are much easier to manage/control by many means. Seining and trapping are great ways to manage small ponds. Drawdowns are a good tool for several reasons. They concentrate fish for eating and allow the dry ground to become much more productive when re-flooded. Just have to be sure it will refill.

GSF and BG are big predators of yoy fish no matter the type including their own species. Male BG as a general matter know there own offspring by smell (chemical detection) and don't eat them. They can tell sneaker BG yoy from there own and have been observed picking out the intruder yoy and eating them. The biggest predator of yoy BG are small BG.

More later as I find interesting parts to the puzzle.