Effects of stream regulation on atlantic salmon, Salmo salar L., and brown trout, Salmo trutta l., in the upper severn catchment, U.K.

• Published in: Regulated Rivers: Research & Management
• Main Authors: Cowx, I. G., Gould, R. A.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 1989
• Subjects: Atlantic salmon; Salmo salar
• Online Access: http://dx.doi.org/10.1002/rrr.3450030123; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Frrr.3450030123; https://onlinelibrary.wiley.com/doi/pdf/10.1002/rrr.3450030123

Abstract Data for three rivers in the upper Severn catchment are examined to assess the influence of regulation strategies on the Atlantic salmon and brown trout populations. In the regulated Afon Clywedog, juvenile recruitment of both species declined steadily following increased utilization of the impoundment for regulation. The decline was considered the response to the variable and rapidly changing discharge regime adopted in the river. Spawning success and juvenile survival of salmonids in the Vyrnwy was relatively stable suggesting the flow regime in this river was less devastating.