Pick up the book "Trout and Salmon of North America" by the honorable doctor trout, Dr. Robert Behnke. The illustrations by Joseph Tomelleri are fantastic.
For some reason, it's out of print and worth more than the original Magna Carta apparently, but I found mine at a Goodwill for 15 bucks.
https://www.amazon.com/dp/0743222202...5363903&sr=8-2
It goes into the fascinating history about pretty much every species of trout and salmon of North America. Of particular interest is the Kern trio of 'native trout,' and how the Kern River Rainbow doesn't exist in it's pure form anymore, thanks to hybridization that occurred throughout the early 1900s.
I'm waiting to see what happens with restoration of the Pauite up in Silver Creek. Hopefully they finish the rotenone treatment and move the original inhabitants back using broodstock from 'secret' creeks where they were stocked into while the poisoning was done.