What must all traps bear according to California regulations?

In California, regulations stipulate that all traps must bear a number or identifying mark that is registered to the Department of Fish and Wildlife. This requirement is crucial for several reasons. First, it helps in identifying the trapper and ensuring accountability for the traps that are set. Having a registered mark allows wildlife management authorities to track the locations and types of traps, which can assist in monitoring wildlife populations and addressing potential over-trapping or illegal activities.

This regulation is aimed at promoting responsible trapping practices while also ensuring that there are measures in place to address any issues related to trapped animals, such as proper identification of owners in case animals are captured unintentionally or problems arise from the traps. The other options do not fulfill this requirement, as personal identification alone does not provide a sufficient form of regulation, and color markings or having no markings would not aid in tracking or accountability. Thus, the necessity for registered identification is central to fostering responsible and regulated trapping practices in California.