Time of Migration and Age Group Structure of Sockeye Salmon (ONCORHYNCHUS NERKA) Spawning Populations in the Naknek River System, Alaska
Straty RR. 1964. Time of Migration and Age Group Structure of Sockeye Salmon (ONCORHYNCHUS NERKA) Spawning Populations in the Naknek River System, Alaska. Fishery Bulletin. 65(2):461-478
The annual sockeye salmon (Oncorhynchus nerka) migration to the Naknek River system, Alaska, was studied to determine to what extent major spawning, populations were segregated by their time of occurrence in the run. The extent of segregation by age in the run and on the spawning grounds was also studied. Daily tagging on the Naknek River and subsequent tag recovery on the spawning grounds showed that segregation of individual spawning populations by time of occurrence in the Naknek run is limited. There was a more or less complete intermingling of most spawning groups throughout the run; consequently, most spawning grounds derive their fish from all parts of the run and, generally, in proportion to the size of the daily escapement. Daily escapement age analysis indicated the lack of marked segregation by age in the Naknek run. No seasonal trend in age was apparent in the 1962 Naknek run. Differences in age characteristics of major spawning ground populations indicated segregation by age on the spawning grounds of the Naknek River system.
- Type
- Journal Article
- Authors
- Straty, Richard
- Units
- KATM
- Keywords
- Age group, Migration, Naknek River system, Sockeye Salmon, spawning populations