0303.45.01.50 - Thunnus orientalis

This category specifically classifies frozen Pacific bluefin tuna, scientifically identified as *Thunnus orientalis*. These are whole, unprocessed tuna that have been preserved through freezing. The classification applies to the entire fish, excluding any processed forms such as fillets or other meat derived from the fish.

The primary distinction for this subheading lies in the species of tuna. While its sibling category, 0303.45.01.10, covers frozen Atlantic bluefin tuna (*Thunnus thynnus*), this subheading is exclusively for *Thunnus orientalis*, the Pacific bluefin tuna. Both are classified under the broader heading for frozen tuna, but this detailed subdivision allows for precise tracking and tariff application based on species.

As this is a leaf node within the Harmonized Tariff Schedule, there are no further subcategories. Therefore, all frozen whole Pacific bluefin tuna (*Thunnus orientalis*) will be classified under this specific code. Classification relies solely on the accurate identification of the species and its frozen, whole form, conforming to the requirements of heading 0303.