California Code, Fish and Game Code - FGC § 8834.1

It is unlawful for any person to possess salmon on board, or to land salmon from, a vessel on which exists any type of trawl net, except that salmon taken incidentally with other species with a trawl net may be possessed and landed if authorized to be taken incidentally pursuant to Section 663.10 of Part 663 of Title 50 of the Code of Federal Regulations, pursuant to a permit issued by the department under Section 1022, or pursuant to both.