Im not 100% on laws over there as i'm in the Uk, but im pretty sure if there was anywhere in the Us Channa would deffinately not be allowed, it would be Maryland. Its just unfortunate for you that it happened to be the original release site for Channa argus, and the whole "Channa invasion" over there....But on the other hand, you could always go fish one out of a lake? There aint many people keeping argus in the world so u already have one over most people haha.
If you look into the local laws there may be a way around it, such as applying for licensing to keep Channa, but that is something i realy dont know about.
Cheers,
Squirl