Have you contacted the CA state fish & game folks to see if they have any information about creating a fishing pond in CA?

I know other states provide information concerning stocking & harvesting ratios etc for ponds. Here is some info from IA which may help you get started in asking the right questions:
http://www.iowadnr.gov/fish/programs/farmpond/fpp.html

I think AL assists landowners in creating ponds so there may also be info on-line through the AL state fish & game department.

Tim