Fin means any of the fins of a shark (including the tail) or a portion thereof.
Land or landing means offloading fish, or causing fish to be offloaded, from a fishing vessel, either to another vessel or to a shore side location or facility, or arriving in port, or at a dock, berth, beach, seawall, or ramp to begin offloading fish.
Naturally attached, with respect to a shark fin, means attached to the corresponding shark carcass through some portion of uncut skin.
50 C.F.R. §600.1202