Richard, I'm certainly no expert but my understanding is that you cannot stock Tilapia at all north of the Tehachapi Mountains so yes essentially none north of the Grape Vine.
Grass Carp can only be sterile of course and it's basically the same, none north of the Tehachapi Mountains, EXCEPT for certain golf course stocking (strong lobby I guess). Although golf courses can get permits for sterile grass carp north of the Tehachapi Mountains there is a TON of paperwork involved, a site inspection and on going monitoring. I know that a few courses up north have done this though.
Here's a link for info:
Tilapia & Grass Carp Info By the way JHAP...I don't own the company. We are a non-profit organization. We didn't plan it that we, that's just what it's become
I have a few client's that became non-profits this year.
