| ID |
2703 |
| Citation |
Schwarz, Carl J. (2010) Analysis of preliminary creel survey and recommendations for a creel survey of Kootenay Lake, British Columbia, Simon Fraser University. Prepared for Fish and Wildlife Compensation Program. |
| Organization |
Fish and Wildlife Compensation Program - Columbia Basin |
| URL |
http://biodiversityatlas.org/reports/details.php?reportID=566&searchterms= |
| Abstract/Description or Keywords |
A survey of anglers was conducted on Kootenay Lake from October 2009 through March 2010 to provide data for designing a one year creel survey, and a preliminary estimate of angler effort and harvest. Eleven days were sampled at five access locations with overflight boat counts occurring on seven of the sampled days. The expansion factor to adjust access interview data to total effort was about 1.4 and relatively stable over the sampled period. A model-assisted approach is used to deal with missing overflight information and the method of multiple imputation is recommended. This model-assisted method with multiple-imputation is very flexible and provides estimates that properly account for the uncertainty in the missing data. Estimated angler effort during the October to March survey was 6870 (SE 984) angler days and 38,403 (SE 4850) rod hours. Bull trout and rainbow trout harvest were estimated as 1031 (SE 288) and 1016 (SE 303) respectively. Daily catch per unit effort (pooled over all sites) ranged from zero to 0.064 for bull trout and zero to 0.149 for rainbow trout. Average length and weight (range) of sampled bull trout was 60 cm (46 – 82) and 2.9 kg (1.0 – 7.0), and for rainbow trout 54 cm (34 – 78) and 2.6 kg (0.4 – 7.4). The log(weight) vs. log(length) relationship cannot be distinguished between the two species. A review of the proposed design for the year round creel survey suggested that effort be approximately split between weekend and weekdays, but that effort be shifted from sampling in the winter months to the summer months. Based on the stability of expansion factor during the off-peak season seen in the preliminary creel survey, the number of overflights can be reduced by about 50% during the off-peak months. A simulator was used to investigate different designs for a one year survey using the feasibility data and other information to approximate the expected precision. The proposed design (and modifications) should provide estimates with relative standard errors (standard error/estimate) at the yearly level of 10% or less which would give 95% confidence intervals at the yearly level of Ī20% or less of the estimates. |
| Information Type |
Report |
| Regional Watershed |
Kootenay Lake |
| Sub-watershed if known |
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| Aquifer # |
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| Comments |
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| Project status |
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| Contact Name |
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