Basic life history and age at maturity information.

This table is a great illistration of the life history of chinook salmon and the various limiting factors they encounter throughout their life history.


This table is a great illistration of the age at maturity comparison for various runs of salmon on Oregon and California's Rivers. Notice that in general the Northern Stock have a much older age at maturity compared to the southern chinook stocks.


This table illistrates age at maturity for various Columbia River Stocks of chinook salmon.


By comparison here is age at maturity for BC and AK chinook stocks.


Here is a table that gives the various spawning return timing from the Northern Oregon Coast to the Southern Oregon Coast.
Ty Wyatt

Oregon PST Indicator Stocks Estimated Escapements 1975-2009

Nehalem 2009 Escapement
The spawning escapement, 4070 (CV = 18%) was estimated using mark-recapture methods. Returning fish were captured by using nets and weirs and then marked with opercular punches. Subsequent carcass surveys were used to recover marked and unmarked fish from the spawning grounds. Since there was no terminal sport fishery in 2009, no creel survey was necessary.
Siletz 2009 Escapement
This mark-recapture program relied on nets and weirs to capture returning fish in the lower river, which were then marked with opercular punches. Carcasses were examined for marks at the spawning grounds. A creel survey was also conducted to estimate removals of marked fish by the terminal sport fishery. The preliminary spawning escapement was estimated at 2,270 Chinook salmon (CV = 13%).





http://www.psc.org/pubs/TCCHINOOK11-2.pdf
posted by Ty Wyatt