California Code, Harbors and Navigation Code - HNC § 4042

(a) Each commissioner shall, within 20 days after receiving notice of appointment, qualify by taking and subscribing the constitutional oath of office, and by executing and filing with the clerk of the county in which the commissioner is appointed, a bond in a sum to be fixed by the board of supervisors, which bond, when approved by the superior court of the county, shall be recorded in the office of the county recorder, as other official bonds are recorded, at any time subsequent to 20 days after the appointment.

(b) The commissioners, or a majority of them having qualified, shall meet at a convenient place in the county and organize by electing a chairperson.