https://www.irs.gov/businesses/small-businesses-self-employed/fishing-tax-center
The term “section 197 intangible” is defined to include “any license, permit, or other right granted by a governmental unit or any agency or instrumentality thereof.” Thus, for example, the capitalized cost of acquiring from any person a liquor license, a regulated airline route, or a television or radio broadcasting license is to be amortized over a 15-year period.
Consequently, the definition of an amortizable intangible can be interpreted to include a limited entry fishing permit.