Table 4. Life-history data (out-migration timing, mean length, and predominant age) for coastal cutthroat trout at initial seawater entry.
| Region River System |
Peak timing | Average length mm (range) |
Major age-class | Percent of major age-class represented (Total no. aged) | Citation | Notes | |
|---|---|---|---|---|---|---|---|
|
Southeastern Alaska |
|||||||
| Petersburg Cr. | June | 246 (144-480) | 5 | 52.4 (21) | Jones 1972 | ||
| mid-June | 247 (120-481) | 5 | 34.7 (95) | Jones 1973 | Majority age 3-6. | ||
| early June | 258 (131-460) | 5 | 34.6 (75) | Jones 1974 | Large cutthroat trout dominated early in the runs, average-sized fish dominated the peak of out-migration, while the latter portion of the outmigration was dominated by small cutthroat trout. 1972-75. | ||
| mid-May to mid-June |
262 (110-508) | 4 | 38.2 (55) | Jones 1975 | |||
| May | 243 (86-515) | 4 | 35.6 (59) | Jones 1976 | |||
| 4-6 | 78.2 (286) | Jones 1977 | Scale analysis revealed sea-runs are at least age 3 at first outmigration. | ||||
| 4-6 | 78.2 (129) | Jones 1977 | |||||
| Eva Lake | May-June | 284 (125-390) | 6 | 30.1 (196) | Armstrong 1971 | Of 88 fish with a growth band considered to be from initial saltwater entrance, 80% were age-3 fish. | |
|
British Columbia | |||||||
| Carnation Cr. | ~145
(120-155) |
Hartman and Scrivener 1990 |
|||||
|
North Coast Washington |
|||||||
| Soleduck (Quillayute basin) | 169 | 2 | 64 (21) | Fuss 1978 | Small sample size; back-calculated age at entrance. | ||
| Dickey Cr. (Quillayute basin) | 211 | 3 | 83 (12) | Fuss 1978 | " | ||
| Goodman Cr. | 255 | 3 | 80 (5) | Fuss 1978 | " | ||
| Hoh R. | 224 | 3 | 78 (18) | Fuss 1978 | " | ||
| Clearwater R. (Queets basin) | 220 | 3 | 63 (37) | Fuss 1978 | " | ||
| Clearwater R. (Queets basin) | 215 | 4 | 59 (105) | Fuss 1982 | Two fish captured intertidally did not exhibit saltwater morphology and scale patterns did not indicate saltwater growth. | ||
| Clearwater R. (Queets basin) | May | 225 | 4 | Garrett 1998 | Ages inferred from length-frequency distributions of catch. | ||
|
Puget Sound |
|||||||
| Stillaguamish R. | 2 | 90 (88) | Johnston 1979 | ||||
| Snow and Salmon Cr. | May | 2 | 76 (35) | Michael 1989 | |||
|
Washington and Oregon coasts |
|||||||
| Purse seine catch | July | 241 | 2 | 45 (110) | Pearcy et al. 1990 | More captured in July, absent in Sept. | |
|
Columbia River |
|||||||
| Gobar Cr. | May | 161 | 2 | 68.8 (32) | Chilcote et al. 1980b | Tributary of Kalama (RKm 31.2). | |
| Kalama R. | 168 | 2 | 63.2 (38) | Columbia tributary on SW slopes of Mt. St. Helens. | |||
| Gobar Cr. | 151 | 2 | 69.9 (55) | Chilcote et al. 1980a | Captured in 1979. | ||
| Kalama R. | 150 | 2 | 64.3 (126) | ||||
|
Oregon coast |
|||||||
| Sand Cr. | April-May | 150(68-278) | 3 | 46.2 (253) | Sumner 1962, 1972 | These are downstream migrants under 28 cm, some may be what Sumner called non-sea-runs, however, age at entrance closely corresponds with number of stream annuli on most sea-runs (3 annuli [46.2%]). | |
| Alsea estuary | late April-early May | 146( 104-177) | 2.4 | (155) | Giger 1972 | Parr captured in the estuary, separated here according to presence of parr marks or silvery appearance, coefficient of condition, and timing of migration. | |
| 231(170-295) | 3.4 | (483) | " | Smolt ages were calculated from fall sea-run catch. | |||
| Siuslaw R. | 3.3 | (782) | " | ||||
| Rogue R. | April to May | 122 (at 2nd annulus) | 2 | 53.9-85.9 (13-205) | Tomasson 1978 | Coastal, sampled in estuary, 4 years of data, 1974-77. | |
| Deer Cr. | April to May | 125-150 | 2 | 48.3 (300) | Lowry 1965 | Downstream migrants, aged by length-frequency analyses. | |
| Flynn Cr. | April to May | 125-150 | 2 | 64.4 (365) | Lowry 1965 | " | |
| Needle Branch Cr. | April to May | 1 | 42.4 (144) | Lowry 1965 | " | ||
| Umpqua and Smith R. | 165-254 | 2 | OSGC 1947 | Oregon State Game Commission, Lower Umpqua River Study, Annual Report. | |||
| Umpqua and Smith R. | 3 | OSGC 1949 | Oregon State Game Commission Annual Report - Lower Umpqua River Study. | ||||
|
California |
|||||||
| Smith R. | late April-early May | 150 (119-174) 232 (76-400) |
Voight and Hayden 1997 | Smolts of various ages. | |||
| Klamath R. | April-May | 192 (127-292) | 2 | McCain unpubl. data | |||
| Redwood Cr. estuary | April | 225 (110-381) | 3 | 61.3 (143) | Redwood National Park 1983, 1988-93. | ||
| Mad R. | April | T. Wesloh10 | |||||
10 T. Wesloh, California Trout, 870 Market St. #859, San Francisco, CA 94102. Pers. commun. to G. Bryant. May 1998.