Effective July 30, 2015, the following regulation changes are in effect for all tuna species (yellowfin, bluefin, albacore, bigeye, skipjack, etc.):
Note: bonito (Sarda chiliensis), Pacific mackerel (Scomber japonicus), and other mackerels are NOT considered tuna and the new fillet regulations are not applicable to these species.
Subsection 27.65(b)(11) - FILLETING OF FISH ON VESSELS.
(b) Fish That May be Filleted: No person shall fillet on any boat or bring ashore as fillets any fish, except in accordance with the following requirements: ...
(11) For all species of tuna filleted on any boat or brought ashore as fillets south of a line running due west true from Point Conception, Santa Barbara County (34° 27' N. lat.) each fish must be individually bagged as follows:
(A) The bag must be marked with the species' common name.
(B) The fish must be cut into six pieces with all skin attached. These pieces are the four loins, the collar removed as one piece with both pectoral fins attached and intact, and the belly fillet cut to include the vent and with both pelvic fins attached and intact.
Subsection 28.38(b) – TUNAS
(b) Bluefin tuna - The special limit for bluefin tuna is 2, which may be taken or possessed in addition to the overall general daily bag limit of 20 finfish specified in subsection 27.60(a). This limit applies to all bluefin tuna possessed, regardless of where taken.
Read the news release announcing the changes, view an illustration of the new tuna fillet requirements (PDF), or watch a video of the new fillet process, provided by Sportfishing Association of California (SAC).