USDA APHIS has quarantine authority over live fish at the border, and the US Fish and Wildlife Service enforces CITES permits and the Lacey Act for species subject to wildlife trade controls. FDA may also have jurisdiction if the fish are destined for human consumption. Importers of ornamental fish should confirm permit requirements with both APHIS and USFWS before shipment.

The heading's subheadings explicitly separate ornamental fish (030111 for freshwater, 030119 for marine) from food-trade species such as trout, eels, carp, and tuna. Classification turns on the species and its intended use: fish kept for display or aquaria go to the ornamental subheadings, while species commercially traded for consumption or aquaculture grow-out fall under the species-specific food-fish subheadings.