How far can carp fly? Not the infamous jumping carp currently infesting the Mississippi River watershed, but basic Eastern European carp. Because either they can fly, or spontaneously generate from the soil, or someone’s been stocking a local lake on the sly.
Ephemeral lakes do not, as a rule, have fish in them. Fish need water. Dry-bottomed depressions in the ground generally do not make good piscatorial premises. Until something like this happens:
Now people are catching good-sized, as in over a foot long, carp in their yards. Assuming that (unlike the Far Side cartoon) the carp did not use SCOBA (self-contained out-of-water breathing apparatus) to walk from elsewhere to the lake, either the carp fell from the sky, appeared via spontaneous generation from something in the once-dry soil, or were slipped into the lake.
Several years ago, when the City of Amarillo deepened a former playa, they announced that they knew people had stocked the old lake with fish even though you are not really supposed to do that. The new lake would NOT be stocked. (I suspect it was filled with fish the instant the last city work-truck pulled out of the parking lot, given the orneryness of fisher-folk.) So perhaps the fish in the Greenways are reincarnated from the former-residents of the city lake.
‘Tis a mystery. 😉