Verified answer

Yes. I know.

No. They are not legal for general sportfishing.

Traps ARE allowed for crayfish and baitfish.

(a) Approved bait fish may be taken only by hand, with a dip net, or with traps not over three feet in greatest dimension. Such bait fish may not be purchased, bartered, sold, transferred or traded; or transported alive from the location where taken. Any other species taken shall be returned to the water immediately. Traps need not be closely attended.

Splittail and Lamprey Changes

Sacramento splittail may be taken only by angling with a bag limit of two fish. The bag limit for lamprey is reduced to 5 and the use of traps no longer allowed.

Best thing to do is check on your DNR page for California... that should point you in the right direction. If you cannot find anything there, maybe go down to your local bait shop and talk to someone in there.