California Code, Fish and Game Code - FGC § 7852.27

At all times when engaged in any activity described in Section 7850 or Article 7 (commencing with Section 8030) for which a commercial fishing license is required, the licensee shall have in his or her possession, or immediately available to the licensee, a valid driver's license or identification card issued to him or her by the Department of Motor Vehicles or by the entity issuing driver's licenses from the licensee's state of domicile.  A current passport may be used in lieu of a valid driver's license or identification card by a holder of a valid nonresident commercial fishing license issued pursuant to subdivision (b) of Section 7852.  The licensee's driver's license, identification card or, if applicable, passport, shall be exhibited upon demand to any person authorized by the department to enforce this code or regulations adopted pursuant thereto.