0303.66.00.00 - Hake (Merluccius spp., Urophycis spp.)

This HTS classification covers frozen Hake, scientifically identified as belonging to the genera *Merluccius* and *Urophycis*. These are whole, headless, or gutted fish that have been frozen. This specific subheading falls under the broader category of frozen fish, excluding fillets and other fish meat of heading 0304. It is specifically grouped with other fish from select families, including Gadidae and Moridae, highlighting its distinct biological and commercial characteristics.

To distinguish this category from its siblings, it is important to note that each subheading is dedicated to a particular species or group of closely related species. For instance, while 0303.63.00.00 covers Cod and 0303.64.00.00 covers Haddock, this classification is exclusively for Hake. Similarly, other adjacent subheadings cover Coalfish, Alaska pollock, and Blue whitings, each with its own scientific identification and distinct market presence.

As Hake (Merluccius spp., Urophycis spp.) represents a leaf node within this HTS structure, there are no further subcategories to introduce. The classification ends at this level, meaning that all frozen Hake, regardless of specific preparation beyond the general scope of this heading, will be classified under 0303.66.00.00. This signifies that further breakdown based on size, processing, or other specific attributes is not provided at this detailed level of the Harmonized Tariff Schedule.