0303.55.00.00 - Jack and horse mackerel (Trachurus spp.)

This HTS classification, 0303.55.00.00, specifically covers frozen jack and horse mackerel, scientifically identified under the genus *Trachurus*. These are distinct species of pelagic fish that are typically caught in large schools and are characterized by their streamlined bodies and often metallic coloration. For customs purposes, this classification applies when these fish are imported or exported in a frozen state, excluding any processed forms such as fillets or other fish meat that would fall under heading 0304.

It is crucial to differentiate this category from its siblings. For instance, while other subheadings within 0303.5 encompass herrings, sardines, mackerel, and cobia, this specific code is exclusively for jack and horse mackerel (*Trachurus* spp.). Proper identification relies on the scientific genus, ensuring accurate classification and avoiding confusion with commercially similar but taxonomically different species. The frozen state is a primary criterion, meaning fresh or chilled fish would be classified elsewhere.

As this classification represents a leaf node, there are no further subcategories. Therefore, all frozen jack and horse mackerel will be classified under this single HTS code. The focus for classification will be on confirming the species as belonging to the *Trachurus* genus and verifying that the product is presented in a frozen form, without further processing into fillets or meat.