California Code, Fish and Game Code - FGC § 5509

It is unlawful to possess on any boat or to bring ashore any fish in such a condition that the species cannot be determined, except as otherwise provided in this code or regulations adopted pursuant thereto.  The commission, subject to the provisions of Section 5508, may adopt regulations whereby fish taken by persons fishing from a vessel licensed pursuant to Section 7920 may be brought ashore in such a condition that the species cannot be determined.