1604.19.61.00 - In oil and in bulk or in immediate containers weighing with their contents over 7 kg each

This HTS classification covers fish, whole or in pieces but not minced, that are prepared or preserved in oil. The key defining characteristic for inclusion here is that the product is presented in bulk or in immediate containers, with each container weighing over 7 kilograms including its contents. This indicates a focus on larger, industrial-sized packaging for preserved fish.

The distinction from sibling categories at this level, such as 1604.19.82.00 (Other), lies precisely in the packaging specification. While other "other" categories might cover different forms of preserved fish or variations in preparation, this specific subheading is narrowly defined by the "in oil and in bulk or in immediate containers weighing with their contents over 7 kg each" criterion. Therefore, any preserved fish not meeting this specific weight and packaging requirement, even if in oil, would be classified elsewhere.

As this is a leaf node, there are no further subcategories to introduce. Classification under 1604.19.61.00 is final once the product meets all the criteria described, specifically being fish (whole or in pieces, not minced) preserved in oil and packaged in large containers exceeding 7 kg.