Cal. Health & Safety Code § 114039.5

(a) Except as specified in subdivision (b), molluscan shellfish life-support system display tanks shall not be used to display shellfish that are offered for human consumption and shall be conspicuously marked so that it is obvious to the consumer that the shellfish are for display only.
(b) Molluscan shellfish life support system display tanks that are used to store and display shellfish that are offered for human consumption shall be operated and maintained in accordance with an HACCP plan as specified in Section 114419.1. Operation and maintenance shall ensure the following:
1. (1) Water used with fish other than molluscan shellfish does not flow into the molluscan tank.
2. (2) The safety and quality of the shellfish as they were received are not compromised by the use of the tank.
3. (3) The identity of the source of the shellstock is retained as specified in Section 114039.4.
(c) Molluscan shellfish life support system display tanks that were in operation prior to the effective date of this part need not comply with Section 114419.