California Code, Fish and Game Code - FGC § 8400

(a) California killifish (Fundulus parvipinnis), mudsuckers (Gillichthys mirabilis), and yellowfin gobies (Acanthogobius flavimanus) may only be taken for commercial purposes with baitfish traps in the tidewaters of Districts 3 1/2, 4, 4 1/8, 4 3/4, 16, 17, and 21, in the tidewaters of District 10 south of the City and County of San Francisco, in the Salton Sea, and in Imperial and Riverside Counties.

(b) Shiner perch (Cymatogaster aggregata), staghorn sculpin (Leptocottus armatus), mudsuckers (Gillichthys mirabilis), and yellowfin gobies (Acanthogobius flavimanus) may only be taken for commercial purposes with baitfish traps in Districts 11, 12, and 13 and in the tidewaters of Districts 2 and 2 1/2.

(c) Any unauthorized species taken incidentally in baitfish traps in the districts specified in subdivisions (a) and (b) shall be immediately released.

(d) Baitfish traps, as described in Section 9020, may be used subject to Article 1 (commencing with Section 9000) of Chapter 4.