It's very different from state to state, but the federal fines for illegal fish are all the same. They're covered under the Lacey Act. That's the $250,000 and 5 years in jail penalty. Here's a link to all of the species considered "injurious" by the Feds. The ones covered under the Lacey Act carry the penalty above.
http://www.fws.gov/fisheries/ANS/pdf_files/Current_Listed_IW.pdf
Don't see Asian Arowanas though, hmm. I'm sure there are other rulings somewhere that I'm not seeing.