Adipose fin: Small fatty fin located between the dorsal fin and the tail on some fish species (see Chinook & Coho Salmon Identification). Aggregate: The total number of fish or shellfish in a bag limit. Generally used where several species make up a combined bag limit, ... Read More→
Resident: A person who has resided in Oregon at least six months immediately prior to the date of making application for a license, tag or permit issued by the State Fish and Wildlife Commission. Temporary absence from the state for a purpose other than establishing residency outside the state shall not be considered in determining whether a person meets the residency requirement. These requirements are waived for certain active members of the uniformed services and for some foreign exchange students.
as I recall, it isn't a matter of proving how long you have been a resident but stating under penalty of law that you have in fact established permanent residency at least 6 months prior to buying your license/tags.