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Kokanee Spawning Ecology and Recruitment Response to Water Level Management in Lake Pend Oreille, Idaho
Citation
Whitlock, Steven Lucas. (2013). Kokanee Spawning Ecology and Recruitment Response to Water Level Management in Lake Pend Oreille, Idaho. Theses and Dissertations Collection, University of Idaho Library Digital Collections. https://www.lib.uidaho.edu/digital/etd/items/etd_408.html
- Title:
- Kokanee Spawning Ecology and Recruitment Response to Water Level Management in Lake Pend Oreille, Idaho
- Author:
- Whitlock, Steven Lucas
- Date:
- 2013
- Keywords:
- Incubation Kokanee Recruitment Spawning Water Level Management Fisheries and aquatic sciences Ecology Natural resource management
- Program:
- Natural Resources
- Abstract:
- Kokanee were the centerpiece of a productive commercial and recreational fishery in Lake Pend Oreille, Idaho for decades, before declining substantially in the late 1960s. The decline has been attributed to poor recruitment caused by a reduction in quality shoreline spawning habitat, which was linked to a hydropower-related shift to a lower minimum water level. This thesis evaluated the effects of habitat characteristics and water level on shore-spawning kokanee incubation success using a laboratory experiment, two in situ incubation studies, and a stock assessment model. All three incubation studies found that substrate size composition was a poor predictor of survival. The in situ studies found that kokanee eggs deposited at depths >10 m were viable and intragravel survival appeared to be enhanced by downwelling in habitat that was ostensibly poor. The egg box investigations and stock assessment model together suggested that water-level management is not an effective strategy for increasing the recruitment of shore-spawning kokanee.
- Description:
- Thesis (M.S., Natural Resources)--University of Idaho, December 2013
- Major Professor:
- Michael Quist
- Type:
- Text
- Format:
- application/pdf
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