U.S. Dept Commerce/NOAA/NMFS/NWFSC/Publications
NOAA-NWFSC Tech Memo-27: Status Review of West Coast Steelhead
Table 5. Ocean age frequency for selected steelhead populations (modal values are presented in bold). Data are from adult steelhead and
indicate age at the first spawning migration. Populations are generally arranged from north to south. Stream-maturing (summer)
steelhead spend up to a year in fresh water prior to spawning; this period has generally been excluded from the ages shown on this
table. Therefore, an age-2-ocean stream-maturing steelhead is actually up to one year older at spawning than an age-2-ocean
ocean-maturing steelhead.
|
|
Ocean age at first spawning migration |
Sample |
|
| Population |
Run typea |
0 |
1 |
2 |
3 |
4 |
5 |
size |
Reference |
| Alaska |
| Karluk River |
S |
-- |
0.18 |
0.79 |
0.03 |
-- |
-- |
62 |
Sanders 1985 |
| Anchor River |
S |
-- |
0.26 |
0.74 |
-- |
-- |
-- |
80 |
Sanders 1985 |
| Upper Copper River |
S |
-- |
0.17 |
0.77 |
0.06 |
-- |
-- |
30 |
Sanders 1985 |
| Situk River |
S/O |
-- |
-- |
0.57 |
0.43 |
-- |
-- |
211 |
Sanders 1985 |
| Sitkoh Creek |
O |
-- |
-- |
0.59 |
0.41 |
-- |
-- |
497 |
Sanders 1985 |
| Karta River |
O |
-- |
<0.01 |
0.72 |
0.27 |
-- |
-- |
542 |
Sanders 1985 |
| British Columbia (mainland) |
| Babine River |
S |
-- |
0.10 |
0.72 |
0.18 |
-- |
-- |
100 |
Narver 1969 |
| Cheakamus River |
O |
-- |
-- |
0.52 |
0.40 |
0.08 |
-- |
64 |
Withler 1966 |
| Capilano River |
O |
-- |
-- |
0.67 |
0.33 |
-- |
-- |
70 |
Withler 1966 |
| Capilano River |
S |
-- |
0.01 |
0.56 |
0.42 |
0.01 |
-- |
86 |
Withler 1966 |
| Seymour River |
O |
-- |
0.07 |
0.57 |
0.34 |
0.02 |
-- |
58 |
Withler 1966 |
| Seymour River |
S |
-- |
-- |
0.64 |
0.36 |
-- |
-- |
25 |
Withler 1966 |
| British Columbia (Fraser River Basin) |
| Coquitlam River |
O |
-- |
0.01 |
0.73 |
0.23 |
0.03 |
-- |
146 |
Withler 1966 |
| Alouette River |
O |
-- |
-- |
0.50 |
0.46 |
0.04 |
-- |
131 |
Withler 1966 |
| Chilliwack River |
O |
-- |
<0.01 |
0.50 |
0.49 |
<0.01 |
-- |
770 |
Maher and Larkin 1955 |
| Chehalis River |
O |
-- |
-- |
0.50 |
0.50 |
<0.01 |
-- |
111 |
Withler 1966 |
| Coquihalla River |
O |
-- |
0.05 |
0.64 |
0.31 |
-- |
-- |
39 |
Withler 1966 |
| Coquihalla River |
S |
-- |
0.12 |
0.83 |
0.05 |
-- |
-- |
150 |
Withler 1966 |
| British Columbia (Vancouver Island) |
| Keough River |
O? |
-- |
0.01 |
0.65 |
0.34 |
<0.01 |
-- |
1391 |
Ward and Slaney 1988 |
| Nanaimo River |
? |
0.01 |
0.68 |
0.31 |
-- |
-- |
-- |
228 |
Narver and Withler 1974 |
| Nahmint River |
S |
-- |
0.05 |
0.91 |
0.03 |
-- |
-- |
58 |
Narver 1974 |
| Washington |
| Skagit River |
O |
-- |
-- |
0.57 |
0.42 |
0.01 |
-- |
n/ab |
WDFW 1994b |
| Deer Creek |
S |
-- |
1.00 |
-- |
-- |
-- |
-- |
n/a |
WDF et al. 1993 |
| Snohomish River |
O |
-- |
-- |
0.57 |
0.42 |
0.01 |
-- |
n/a |
WDF et al. 1993 |
| Green River |
O |
0.02 |
0.07 |
0.66 |
0.25 |
-- |
-- |
100 |
Pautzke and Meigs 1941 |
| Puyallup River |
O |
-- |
-- |
0.70 |
0.30 |
-- |
-- |
n/a |
WDFW 1994b |
| Nisqually River |
O |
-- |
-- |
0.63 |
0.36 |
0.01 |
-- |
n/a |
WDFW 1994b |
| Hoh River |
O |
-- |
0.02 |
0.81 |
0.17 |
-- |
-- |
n/a |
Larson and Ward 1954 |
| Quillayute River |
O |
-- |
-- |
0.53 |
0.45 |
0.02 |
-- |
n/a |
WDFW 1994b |
| Chehalis River |
O |
-- |
0.07 |
0.72 |
0.20 |
0.01 |
-- |
n/a |
Larson and Ward 1954 |
| Columbia River Basin |
| Toutle River |
O |
-- |
0.08 |
0.81 |
0.11 |
-- |
-- |
37 |
Howell et al. 1985 |
| Cowlitz River |
O |
-- |
-- |
0.64 |
0.34 |
0.02 |
-- |
56 |
Howell et al. 1985 |
| Kalama River |
O |
-- |
0.04 |
0.76 |
0.20 |
-- |
-- |
1363 |
Howell et al. 1985 |
| Kalama River |
S |
-- |
0.20 |
0.74 |
0.06 |
-- |
-- |
909 |
Howell et al. 1985 |
| Willamette River |
O |
-- |
-- |
1.00 |
-- |
-- |
-- |
141 |
Howell et al. 1985 |
| Washougal River |
S |
-- |
0.14 |
0.71 |
0.14 |
-- |
-- |
7 |
Howell et al. 1985 |
| Wind River |
S |
-- |
0.05 |
0.68 |
0.26 |
-- |
-- |
19 |
Howell et al. 1985 |
| Klickitat River |
S |
-- |
0.16 |
0.79 |
0.05 |
-- |
-- |
148 |
Howell et al. 1985 |
| Deschutes River |
S |
-- |
0.53 |
0.47 |
-- |
-- |
-- |
100 |
Howell et al. 1985 |
| John Day River |
S |
-- |
0.51 |
0.44 |
0.04 |
-- |
-- |
115 |
Howell et al. 1985 |
| Yakima River |
S |
-- |
0.51 |
0.47 |
0.02 |
-- |
-- |
64 |
BPA 1992 |
| Wenatchee River |
S |
-- |
0.76 |
0.18 |
0.06 |
-- |
-- |
17 |
Howell et al. 1985 |
| Entiat River |
S |
-- |
0.88 |
0.12 |
-- |
-- |
-- |
8 |
Howell et al. 1985 |
| above Wells Dam |
S |
-- |
0.30 |
0.70 |
-- |
-- |
-- |
349 |
Mullan et al. 1992 |
| Snake River Basin |
| Lower Granite Dam |
S |
-- |
0.29 |
0.55 |
0.16 |
-- |
-- |
100 |
Hassemer 1992 |
| Clearwater River |
S |
-- |
0.61 |
0.38 |
0.01 |
-- |
-- |
510 |
Whitt 1954 |
| S.F. Salmon River |
S |
-- |
-- |
0.20 |
0.80 |
-- |
-- |
65 |
BPA 1992 |
| Lemhi River |
S |
-- |
0.09 |
0.86 |
0.05 |
-- |
-- |
353 |
BPA 1992 |
| Oregon |
| Nehalem River |
O |
-- |
0.07 |
0.84 |
0.08 |
-- |
-- |
310 |
Weber and Knispel 1977 |
| Alsea River |
O |
-- |
0.05 |
0.66 |
0.26 |
0.03 |
-- |
978 |
Chapman 1958 |
| Siuslaw River |
O |
-- |
-- |
0.82 |
0.17 |
0.01 |
-- |
125 |
Lindsay et al. 1991 |
| Rogue Riverc |
O |
-- |
0.14 |
0.86 |
-- |
-- |
-- |
547 |
ODFW 1990 |
| California |
| Klamath River |
S |
-- |
0.78 |
0.22 |
<0.01 |
-- |
-- |
391 |
Kesner and Barnhart 1972 |
| Mad River |
O |
-- |
0.28 |
0.69 |
0.03 |
-- |
-- |
35 |
Forsgren 1979 |
| Jacoby Creek |
O |
-- |
0.35 |
0.63 |
0.02 |
-- |
-- |
109 |
Harper 1980 |
| Van Duzen River |
S |
-- |
0.09 |
0.62 |
0.29 |
-- |
-- |
58 |
Puckett 1975 |
| M. F. Eel River |
S |
-- |
0.56 |
0.42 |
0.02 |
-- |
-- |
82 |
Puckett 1975 |
| Sacramento River |
O? |
-- |
0.57 |
0.43 |
-- |
-- |
-- |
83 |
Hallock 1989 |
| Waddell Creek |
O |
-- |
0.60 |
0.40 |
<0.01 |
-- |
-- |
3,888 |
Shapovalov and Taft 1954 |
aO = Ocean maturing; S = Stream maturing.
bSample size not indicated in reference.
cAdults with half-pounder life history (spawning migrants, ODFW 1990) are included as age-2-ocean; these comprise 26% of the sample size.