Former Bumble Bee CEO Chris Lischewski is fighting a December ruling that found him guilty of participating in a criminal conspiracy to fix prices of canned tuna sold in the United States.

On Jan. 13, Lischewski filed a motion for judgment of acquittal with a US District Court in San Francisco, where only a month earlier he was convicted by a jury of being the mastermind behind the massive scheme involving Bumble Bee, Starkist and Chicken of the Sea International.