Im a big fan of Darwin and i agree. Mutations happen and i did get him from a straight run mass production type deal.I think alot of things are possible, especially when there are more chances for it to happen(population explosion) the more organisms in a population the more chances for anomaly. I’ve seen salmon artificially hatching, in the wild the anomalies I saw would not have emerged from the gravel, but being artificially incubated they were all exposed(two heads, four eyes, one eye, two fish one head) from 5 thousand eggs per pair. See what I’m getting at, so many possibilities.
I’m sure if you told a fish “expert” about how angler fish mate 50 years ago they would say “that’s impossible, no way”