They are black crappie and have been purchased from several sources...Dunns & Overtons. We only stock 100 per season, we have never seen/caught anything smaller than what we stock. Water visibility ranges but is generally about 16-24". We have a very fertile pond in Fayette County (about an hour east of Austin) Generous watershed area and around 37" annual rainfall. Zillions of bgill, not uncommon to catch a lot of bass too. My guess is that the crappie do reproduce, but the fry don't stand a chance. This is only my observation, but there is a LOT of gravel along the shoreline, roughly 2/3rds. Bgill nests are dotted along the bank year round with abundant reproduction. I believe the rock structure and the water visibility are the keys to eliminating crappie reproduction.