Record Details
Population dynamics of coastal cutthroat trout in an experimental stream
ScholarsArchive at Oregon State University
| Field | Value |
|---|---|
| Title | Population dynamics of coastal cutthroat trout in an experimental stream |
| Names |
Nickelson, Thomas E.
(creator) Davis, Gerald E. (advisor) |
| Date Issued | 1974-05-06 (iso8601) |
| Note | Graduation date: 1974 |
| Abstract | Population dynamics of coastal cutthroat trout were studied in a controlled-flow section of Berry Creek, Oregon, from August 1972 to August 1973. All trout except the underyearlings were tagged to allow movement, survival and weight change of individual trout to be monitored. Fifty-eight percent of the tagged trout which were present in the study area for at least one month after the beginning of the study moved from one stream location to another. In general, the trend in movement was upstream during periods of low flow and downstream during periods of high flow. Monthly mortality ranged from 1.0 to 17.5 percent of the population. High mortality during summer and fall was probably related to starvation and low stream flow. The annual expectation of death ranged from 0.57 for the 1972 year class to 1.00 for the 1967 year class. Growth rate and production values for the population were positive only from December 1972 through May 1973 and were negative during other months of the year. Total annual production for the population was 0.491 g/m². Annual production values were positive for the 1971 through 1973 year classes and negative for the 1967 through 1970 year classes. Annual production values were positive for those members of the 1969 and 1970 year classes which survived the entire year within the study area. Mean monthly trout biomasses ranged from 2.92 to 8.55 g/m² for the total study area and from 0.23 to 76.41 g/m² in specific stream locations. During most of the year positive values of production were recorded only for locations where the biomass was less than 4 g/m². During spring, high values of production were recorded for locations with trout biomasses as high as 14 g/m². Stream flow was probably a major factor affecting trout growth and production. |
| Genre | Thesis/Dissertation |
| Topic | Fish populations |
| Identifier | http://hdl.handle.net/1957/22317 |
