Ohio Rev. Code § 1533.322: Exemption from fishing license requirement.

Any person who is duly licensed by any state, district, country, or sovereignty other than this state to take or catch fish by angling shall be exempt from the provisions of sections 1533.32 and 1533.99 of the Revised Code, provided such person has complied with the law in regard to taking or catching fish by angling in the state, district, country, or sovereignty where he is licensed and complies with such law while taking or catching fish by angling in this state. Such exemption shall be operative only if the law of such other state, district, country, or sovereignty makes substantially like and equal exemptions to persons duly licensed by this state to take or catch fish by angling.

Reciprocal agreements between this and any other state, district, country, or sovereignty necessary to administer this section shall be made as provided in section 1533.323 of the Revised Code.