and Results of 2004
Chinook salmon die after spawning, so any fish not taken
by anglers or the hatchery end up dead in the river. Carcass surveys
were conducted weekly at nine
on September 4th, 2004. The sites were chosen to represent
the river from the lower to the river mouth, with three sites
located in the lower, middle, and upper sections. Information
including length, sex, and spawning condition (full or spent)
was collected from all carcasses. Each carcass was tagged with
a plastic cable tied through the jaw to ensure that it would
not be recounted.
Scholar Dustin W. Everitt handles a fresh Chinook salmon carcass
on the Salmon River
carcasses were found in the upper river, with the three
upstream sites contributing 76% percent to the total carcass
count (Figure 6). The carcasses varied in sizes with the average
female being 83.3 cm and the average male at 81.7 cm.
6. Percent of total carcasses distributed by site.
The peak for carcass abundance occurred
during the weeks of Oct. 16th, 23rd and 30th ( Figure 7). During
this period, a transition occurred in the spawning condition
of the fish. In the weeks leading to the
peak of carcass abundance, most carcasses were full (Figure 8). During
and after peak carcass
abundance, most carcasses were spent.
Figure 7. Weekly carcass abundance, showing a peak
during the 8th week of the study.