The commercial processors gut most of the fish they process and half of them contain eggs. A tariff won't stop them from gutting the fish nor will it prevent the fishermen from catching them. There has been a glut of commecially caught salmon for years yet the harvest continues as usual despite extremely low valuations buoyed by government subsidies.
The reason personal use anglers are prohibited from selling their catch is to prevent competition with the commercial harvesters. In many parts of the world this distinction is not so sharp and any legally caught fish may be offered for sale. On the surface this has always seemed like a good idea to me but in more recent years my opinion has moved towards support of the current prohibition.
Personal use fishermen will tend to catch and keep only what they can use or, with many, give away. Most who retain in excess get tired of tossing out freezer burnt waste.
If commercial sales of what we call 'sport caught' fish were legal it would simply encourage many honest anglers to catch and keep as many as the law would allow and also serve to increase poaching beyond legal posession limits. It would no longer be sport fishing and would certainly not qualify as personal use fishing.
I recommend we... "Limit Our Catch" rather than "Catch Our Limits"!
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Why are "wild fish" made of meat?