Record Details
Steelhead trout otoliths for age, race, and stock analysis
ScholarsArchive at Oregon State University
| Field | Value |
|---|---|
| Title | Steelhead trout otoliths for age, race, and stock analysis |
| Names |
McKern, John L.
(creator) Horton, Howard F. (advisor) |
| Date Issued | 1971-03-12 (iso8601) |
| Note | Graduation date: 1971 |
| Abstract | Growth characteristics of otoliths were used to determine age, and to separate known races and stocks of steelhead trout (Salmo gairdneri). Otoliths were the first calcified structures observed in X-ray photographs of steelhead embryos, and a continuous record of events through life was interpreted from these structures. A direct relationship was established between otolith length and fork length of the fish. Freshwater and saltwater annuli, and spawning checks on otoliths were used to describe 27 life history patterns. A significant difference in nucleus diameters of otoliths was used to separate summer and winter races. Significant differences in freshwater growth characteristics were used subjectively to separate wild from hatchery-reared stocks of steelhead. The use of otoliths represents a valid technique to supplement those now available for management of this species. |
| Genre | Thesis |
| Topic | Steelhead (Fish) |
| Identifier | http://hdl.handle.net/1957/9588 |
