| A B S T R A C T
Reintroduction of spring Chinook salmon into Lookingglass Creek, Oregon
| Spring
Chinook salmon (Oncorhynchus tshawytscha) were native to
Lookingglass Creek, Oregon, but were functionally extirpated a few
years after the construction of Lookingglass Hatchery in 1982. Reintroduction
efforts have been made using non-endemic (Rapid River) and endemic
(Catherine Creek) stocks. We describe historical production using
numbers of juvenile outmigrants and survival to Lower Granite Dam,
adult returns, and smolt-to-adult ratios for fish of natural and hatchery
origin, along with total redds and redd distribution during three
eras: endemic (prior to 1982), Rapid River (1982-2000), and Catherine
Creek (2001-present). We also describe life history of juveniles (arrival
timing of outmigrants to Lower Granite Dam) and adults (arrival timing
at the Lookingglass Hatchery weir). The number of returning adults
is presently limited by the relatively low number of hatchery juveniles
released combined with mortality factors common to many anadromous
species in the Snake and Columbia River basins.Spring Chinook salmon
(Oncorhynchus tshawytscha) were native to Lookingglass Creek, Oregon,
but were functionally extirpated a few years after the construction
of Lookingglass Hatchery in 1982. Reintroduction efforts have been
made using non-endemic (Rapid River) and endemic (Catherine Creek)
stocks. We describe historical production using numbers of juvenile
outmigrants and survival to Lower Granite Dam, adult returns, and
smolt-to-adult ratios for fish of natural and hatchery origin, along
with total redds and redd distribution during three eras: endemic
(prior to 1982), Rapid River (1982-2000), and Catherine Creek (2001-present).
We also describe life history of juveniles (arrival timing of outmigrants
to Lower Granite Dam) and adults (arrival timing at the Lookingglass
Hatchery weir). The number of returning adults is presently limited
by the relatively low number of hatchery juveniles released combined
with mortality factors common to many anadromous species in the Snake
and Columbia River basins. |
back to agenda | 
