You can't sell tilapia for bait anywhere in california except the Salton Sea. I guess that makes sense. nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=3253

Below is the governing document.
State of California - The Resources Agency
DEPARTMENT OF FISH AND GAME
RESTRICTED SPECIES LAWS AND REGULATIONS
IMPORTATION, TRANSPORTATION AND POSSESSION OF WILD ANIMALS - MANUAL 671
http://www.dfg.ca.gov/licensing/pdffiles/fg1518.pdf is the current regulation sited for tilapia.
671. Importation, Transportation and Possession of
Live Restricted Animals.
1. Tilapia sparrmani (Banded tilapia) (D).
2. Tilapia zilli (Redbelly tilapia) (D), except permits may
be issued to a person or agency for importation, transportation,
or possession in the counties of San
Bernardino, Los Angeles, Orange, Riverside, San
Diego, and Imperial.
3. Tilapia aurea (Blue tilapia) (D).
4. Tilapia nilotica (Nile tilapia) (D).

O. mossambica is not on the list and so is legal unless there is some local regulation against it.

Hybrids like Rocky Mountain White would be declared illegal after some investigation as they are a cross between two restricted species.