efw:
Here in the PNW, adipose fins get clipped on hatchery steelhead and salmon. Presently, non-clipped salmon/steelhead are assumed to be native born and must be released if taken in the ocean or fresh water.
Among trout, native born fish will have perfect fins exhibiting nice straight rays and perfect coloration. Hatchery stock, being packed in close proximity with no means of escape are always jabbing one another like a bunch of teenage boys. The handiest attack is to bite other's appendages. Cement tank bottoms also erode the bottom rays of their tails. Even years later, those fish will exhibit healed but still deformed rays within their fins.
Our wild trout also have much darker flesh than their hatchery relatives likely due to a more diverse diet.
Given the huge numbers of hatchery trout released into our impoundments, there's no fin clipping. Again, Oregon stocks trout in lakes and ponds, but relies on Mother Nature to keep their populations going in our streams. With only a few exceptions, all of our waters are open year-round with mostly 2 fish daily limits in streams and 5 in lakes and ponds. Some of our finer streams are strictly catch and release for trout.
If one has live/dead interests: Live fisheyes are always oriented down. Dead fish look straight to the sides. Among some snobby circles, one can be damn near crucified for posting a dead fish image.
A wild born Brookie
A river born Steelhead from Oregon's Deschutes but probably a straying Clearwater Id fish
River born Cutthroat
A hatchery Steelhead with adipose clipped. Fish was bonked on the head and retained. Note eye position.
One slimy looking bastard. Nice fish though and fun on a fly rod.
Don't seem to have any images of hatchery trout.