To me, a sportsman is a person who hunts or fishes in a manner that is legal, challanging, respectful of the quary, gives the quary a chance at getting away (a very good chance in my case lately), and doesn't hurt the resource as a whole. A great sportsman is one who excels at capturing their quary in the manner above and actually contributes to the improvement of the resource.
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If every fisherman would pick up one piece of trash, we'd have cleaner rivers and more access.