Final answer:
A live display tank for molluscan shellfish would typically require a HACCP plan, variance from a regulatory authority, a water filtration system, a cooling device to control water temperature, and a liquid waste drain lane with an air gap to prevent backflow.
Step-by-step explanation:
The topic about live display tanks for molluscan shellfish borders on various aspects of shellfish biology and aquaculture practices. Among the options provided, a proper live display tank would ideally require a HACCP plan (Hazard Analysis Critical Control Point) and a variance from a regulatory authority to ensure the safety and quality of the shellfish being displayed. Additionally, because shellfish are aquatic organisms, features such as a water filtration system and a device to regulate the water temperature (ideally below 41 F / 5 C) are essential. Finally, to prevent contamination from the backflow of waste water, a liquid waste drain lane equipped with an air gap could also be beneficial. The exact requirements may vary depending on the specific species of molluscan shellfish and local regulations.
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