Cal. Fish & Game Code § 15003

(a) The department may assess a fee on persons growing aquaculture products on public lands and in public waters based on the price per pound of the products sold. The fees, if imposed, shall be set at amounts necessary to defray the costs of the commission and the department in administering this division. However, the fees if any, may not exceed the tax rates as provided in Section 8051.

(b) The price per pound for these taxation purposes shall be based on the whole product weight or its equivalent as taken by the lessee.

(c) The privilege tax imposed by this section shall be paid monthly to the department within 30 days after the close of each month. If not paid within 60 days after the close of the month in which it is due, a 10 percent penalty shall be paid.