36 CFR § 20.2 - Permits; conditions.
Annual, revocable special use permits authorizing the use of Government-owned structures and facilities in the Park as bases for commercial fishing in the waters contiguous to the Park may be granted by the Director of the National Park Service, or the Regional Director if authorized by the Director, to bona fide commercial fishermen, where such structures and facilities were used for this purpose during the period from April 1, 1937, to December 31, 1939, inclusive, subject to the following conditions.
(e) Permittees shall use the bases covered by the permit for commercial fishing only. No permittee shall furnish boat or guide service to the public unless expressly authorized to do so by the Secretary or the Director.
(f) Permittees shall maintain at their own expense, in accordance with reasonable standards of repair, safety, and sanitation, all Government-owned structures and facilities embraced in the permits.
(g) The size, type and location of nets and gear and the number of men engaged in the operation of the fishing base of the permittee shall be prescribed in the permit. Only nets and gear approved by the Michigan Department of Conservation shall be used.