dont have time to look for the exact answer but i did think this was cool when i was looking it up.
http://en.wikipedia.org/wiki/Burbot
finland sells burbot roe as caviar........ also one of our AO members is mentioned in the wikipedia article with his record. thats cool. someone can take over for me and find the answer source but im 90% sure its because its not considered a "game fish" its "catch and kill" all burbot in utah