Where any person is convicted of an offence against this Act, the court, in addition to any other penalty imposed—
(a) may order that any fishing vessel (together with its fishing gear, stores and cargo) and any vehicle, fishing gear, net or other fishing appliance, used in the commission of the offence be forfeited; and
(b) shall order that any fish caught in the commission of such offence or the proceeds of sale of such fish and any explosive, poison or other noxious substance used in the commission of such offence be forfeited.