Heres a partial listing- I am not very familiar with CA and theres likely alot more but it will get you started. Many aquatic vets make house calls, too. You may want to start with UCDavis vet school. Even if they do not specifically see fish, they should be able to offer recommendations for vets in your area. You will need to google/contact them to see if the numbers are current and if they are still in practice.
Dr/city/number:
Dr Yen berkley 510-549-1252
Dr Willett davis 530-758-1484
Dr Weber/UCDavis vet school 530-752-1393
Dr Virgo bakersfield 661-339-6406
Dr Szignarowitz rescue 916-310-0962
Dr Stone los gatos 408-353-8164
Dr Ridegway long beach 562-434-9966
Dr Jenkins san diego 619-260-1412
Dr Hildreth marietta 951-696-9501/714-393-5116
Dr Cecil san diego 619-546-0777
Dr Zambrano stanton 714-254-9974
Dr Wells 831-647-1147
Good luck!!!!