Cal. Fish & Game Code § 2348

(a) The outside of a package offered to or received by a common carrier or the carrier’s agent for transportation, or transported by a common carrier or agent, that contains a bird, mammal, fish, reptile, or amphibian, shall clearly and conspicuously indicate the following:
1. (1) The name and address of the shipper.
2. (2) The name and address of the consignee.
3. (3) The number and kind of bird, mammal, fish, reptile, and amphibian contained in the package.
(b) Licensed commercial fishermen and licensed commercial fish dealers are subject to all of the provisions of this section, except that commercial shipments of fish may be indicated by total net weight of each species instead of by numbers.