The Journal of Transdisciplinary Environmental Studies' (TES)
Volume 3, Number 2, June. 2004

ISSN 1602-2297

The Negative Impacts of Sedimentation on Brown Trout (Salmo trutta) Natural Recruitment, and the Management of Danish Streams

John Conallin, International Masters Student
Department of Environment, Technology and Social Studies, Roskilde University, Denmark

Abstract: Deposition rates of fine sediments into egg baskets situated in simulated brown trout redds were measured during the winter of 2002-2003. The survival of brown trout alevins (fry) were recorded to assess if sedimentation was having a detrimental effect on natural recruitment levels within the stream River Langvad. River Ledreborg an almost pristine stretch of stream was used as the control. Both streams are situated in the County of Roskilde, Denmark and are representative of many of the small streams situated on the island of Zealand, Denmark. Sedimentation was found to be having an effect on the natural recruitment levels in River Langvad as no survival of alevins was recorded. A combination of factors was more than likely to have led to such a result. More surprising was the finding of high sedimentation in the River Ledreborg and as a result of this sedimentation; low natural recruitment levels were recorded. Management measures for the two streams are proposed.

Keywords: Sedimentation, Brown trout, Natural recruitment, Fish habitat, Anthropogenic impacts, Danish streams, Management issues

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