Question

These two browns are mature.
Their head length and fin size look about the same.
They are within a year old of each I guess.
One was caught in non-designated trout water.
The other from a well known stream in my homewater.
Why does one have serious shoulders and the other is kinda skinny?
Is this a good genes thing or over population thing?
You ever catch a horse and a skinny in the same hole?
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