1604.12 - Herrings:

This HTS category, 1604.12, specifically covers herrings that have been prepared or preserved. This includes fish that are whole or in pieces, but not minced, falling under the broader classification of "Fish, whole or in pieces, but not minced" within the chapter dedicated to preparations of fish.

Distinguishing 1604.12 from its siblings, other subheadings at the 1604.1 level are dedicated to different species of fish. For example, 1604.11 pertains to salmon, 1604.13 covers sardines, sardinella, and brisling or sprats, and 1604.14 is for tuna, skipjack tuna, and bonito. This category's uniqueness lies in its exclusive focus on herrings, irrespective of their specific preparation method beyond being whole or in pieces.

The subcategories within 1604.12 further refine the classification based on the packaging and preservation medium. The primary subdivision is for herrings prepared in oil and packed in airtight containers, differentiating them from all other preparations of herrings not meeting this specific criteria. This allows for precise tariff application based on the method of preservation and presentation.