To clarify you are asking about obtaining a fish deemed illegal to buy,sell or posess in your state
A misdemeanor violation was established, with a fine of up to $10,000 and imprisonment of up to 1 year, or both. Civil penalties up to $10,000 were provided. However, the Criminal Fines Improvement Act of 1987 increased the fines under the Lacey Act for misdemeanors to a maximum of $100,000 for individuals