Cal. Fish & Game Code § 8250.5

(a) Subject to this article and Article 1 (commencing with Section 9000) of Chapter 4, a lobster trap, as described in Section 9010, may be used to take lobster for commercial purposes under a lobster permit issued pursuant to Section 8254.
(b) The following species may be taken incidentally in lobster traps being fished under the authority of a lobster permit issued pursuant to Section 8254, and any other species taken incidentally shall be immediately released back to the water:
1. (1) Crab, other than Dungeness crab.
2. (2) Kellet’s whelk.
3. (3) Octopus.
(c) Spiny lobsters taken in the manner commonly known as skindiving or by a person using self-contained underwater breathing apparatus shall not be sold.