As far as implementing fishing and enforcing the rules around fishing are concerned, it's merely a classification of size. When we regulate, anything that is caught in steelhead-bearing water that is greater than 50 centimetres is classified as a steelhead, whether it's a steelhead or not.
Biologically, there is a genetic predisposition to being a steelhead and a genetic predisposition to not being a steelhead. That's a little—