Wow, interesting stuff!
I asked Ian Rutter a similar question years ago, and he said something to the effect that the creel policy - 5 fishes 7" or larger - tends to mean that there are more fingerlings in the stream. Were the policy the opposite - keep up to 7 fish 5 inches or less (I am paraphrasing - Ian feel free to correct me), then there would be more room in the streams for bigger (albeit fewer) fishes.
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