"Doesn't the DFG now stock a lot of Golden trout? Also aren't Cottonwood Lakes 1-4 closed to fishing"
I don't know if DFG is still stocking in the NP's, but they used to. That is how Goldens came to be in places like Darwin Canyon, Martha Lake, etc. Their original range was in the Kern Basin. I don't fish anymore and therefore don't follow current practices closely but, the last I heard, Cottonwood Lakes 1-4 were closed. As I understand it, they are used as a source of genetically pure Golden Trout for planting elsewhere and to preserve the species. I ran into a very knowledgable fisherman a few years back as I was heading into the Kern Basin. He worked part time, gratis, for DFG and his assignment was to fish as many lakes as possible where "Goldens" were found and take tissue samples(fin clippings) back for DNA analysis to determine the range of genetically pure Goldens. He said that almost everywhere he fished, the fish were hybridized Rainbow-Goldens, and that Cottonwood Lakes and a few streams(unnamed-don't ask, don't tell) emptying into the Kern River were the only places where genetically pure Goldens could be found anymore. Tough job, huh?