Record Details
The energetic response to handling stress in juvenile coho salmon (Oncorhynchus kisutch)
ScholarsArchive at Oregon State University
| Field | Value |
|---|---|
| Title | The energetic response to handling stress in juvenile coho salmon (Oncorhynchus kisutch) |
| Names |
Davis, Lawrence E. (Lawrence Edward), 1965-
(creator) Schreck, Carl B. (advisor) |
| Date Issued | 1993-02-16 (iso8601) |
| Note | Graduation date: 1993 |
| Abstract | Various aspects of the energetic response to handling stress in juvenile coho salmon (Oncorhynchus kisutch) were examined. Fish were subjected to four different handling stressors in a Blazka-style respirometer. Stressed fish had rates of oxygen consumption that were higher than controls. The magnitude of the increase ranged from 139 to 198% of the control value, and appeared roughly related to the severity of the stressor. The post-stress increase in oxygen consumption also appeared to vary seasonally, with less of a stress effect on respiration observed in the spring as compared to the fall. Elevation in oxygen consumption following stress was largely eliminated within 1 h post-stress, but metabolic rate may have remained slightly elevated for an additional 2 h. Plasma cortisol and lactate titers also increased significantly following handling stressors. Oxygen consumption was positively correlated with both plasma cortisol and lactate after a moderate stressor, but no correlation was found after more severe stressors. Whole body lactate concentration was significantly elevated following stress, reaching levels almost 500% higher than controls. By 5 h post-stress whole body lactate had returned to control levels. The mechanism of excess post-stress oxygen consumption remains unclear. Fish given exogenous cortisol did not experience an increase in oxygen consumption, so it is unlikely that cortisol alone has a major effect on metabolic rate. Similarities between the energetic responses to both stress and exercise suggest that the results of exercise physiology may provide a basis for understanding the energetic response to stress. |
| Genre | Thesis/Dissertation |
| Topic | Coho salmon -- Effect of stress on |
| Identifier | http://hdl.handle.net/1957/36459 |
