I think the best argument to C&R for a person who don't belive in C&R is the cost per eating a single fish...
Make a balance of the total cost of a fish, including Reels, Roods, Lizards, Grubs, Line, Boat, Gasoline and a long etc. .... and then, compare to eating a fish (off curse, in a romantic dinner for 2) in the most expensive restaurant of the city...