There isn’t a minimum size limit on rockfish in California. From the California Department of Fish and Wildlife:
Many rockfish species will not survive if caught in deep water and returned to the ocean. Because of changes in internal pressure after the fish is hooked and retrieved from great depths, there is physical trauma to the gas bladder and other internal organs (called barotrauma). Minimum size limits would not be an effective management tool for most species of rockfish because of this reason.