Thumper I would like to see a scientific paper that supports that.

I've been helping on a natural rearing channel for coho. A lady from nmfs came out and sampled the naturally reared fish vs. the hatchery fish for color. She determined that there was a significant difference in the color between the two groups of fish. If hatchery fish have never been in a dark environment like most of them haven't then they don't have the ability to darken up like naturally reared fish. Fish that have been in a natural environment have the ability to both lighten and darken up so they can blend in better. I'm too tired to go on about the differences.

~ Dr Pepper