I spoke a smidge too soon. A week later, and the hatchery pond has been blown out twice do to rain. A 4" rain did it last week, and another 2" rain today. The timing probably couldn't have been better though. Whatever possibly got in the pond won't start spawning until spring, so no issues with mixed spawns. I do have a 1/4" screen on the outlet pipe, and I doubt anything that small is still swimming in January. I did some dirt work and widened the emergency spillway, and even with heavy rains, the water depth is rarely over an inch deep.
I may have interlopers, but I doubt I lost many of the CNBG.
