Juvenile Atlantic salmon Salmo salar abundance and angling success before and after river diversion

By C. Paul Ruggles
Biological Conservation, Volume 43, Issue 4, 1988, Pages 279-294, ISSN 0006-3207, DOI: 10.1016/0006-3207(88)90121-8.

A hydroelectric development in Nova Scotia, Canada, diverted approximately 18% of the upper Cheticamp River drainage area for power generation. Comparisons of pre- and post-development Atlantic salmon Salmo salar juvenile populations and adult angling statistics indicate that the flow release strategy in the Cheticamp River was successful in protecting the valuable salmon resource. Predictions of how the fishery resource would respond to the altered hydrologic regime in the river were accurate. A lack of suitably precise pre-development baseline data on juvenile Atlantic salmon abundance, however, reduced the precision of the measurement of impact resulting from the altered flow regime. The inherent variability of population estimates based on the quantitative depletion method suggests that at least 10 samples are required to derive useful estimates of juvenile Atlantic salmon abundance under conditions found in the study river.

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