Carp In The News Again!!!

 

This got a few inches of column in the local paper today.  Someone panicked when they found what the paper described as an "illegal Grass Carp" in Michigan waters.  They rushed the deceased operative to a fishology lab where she is being tested to determine whether she is -- or, I guess, WAS -- capable of reproducing. 

Questions:

>> How can a Carp be illegal?

>> Why WOULDN'T she be capable of reproducing?