Title: Effects of flow regime on the young stages of salmonid fishes- summary and conclusions based on results for 1981- 1985
Author: D.T. Crisp
Document Type: Monograph
Abstract:
The main British salmonid species spawn in clean gravel in streams and rivers, many of them in the upland areas of Britain. The earliest stages of the life cycle (eggs and alevins) spend some months within the gravel of the river bed. During this period their survival rate can be strongly influenced by flow regime and by related phenomena such as movement of coarse river bed material, changes in water level and the deposition of silt. It is also likely that the survival and/or rate of downstream dispersal of free-swimming young stages will be influenced by flow regime. In recent years human influence upon the flow regimes of upland water courses and upon the sediment inputs to them has increased. This largely reflects an increase in the rate of change of upland land use through such activities as impoundment, water transfer, forestry, land drainage and land improvement. In order to conserve and, if possible, enhance the populations of salmonid fishes (which are an important commercial and sporting resource) deeper understanding of the interrelationships between survival of young salmonids and flow-related phenomena is needed. The acquisition of appropriate information is the main aim of this report.
Publisher: Freshwater Biological Association
Publication Date: 1985
Publication Place: Ambleside
Subject Keywords: Salmonidae; Life cycle; Young animals; Flow rate; Silt; Sediments; Survival; Environmental factors; Anthropogenic factors; Spawning; Gravel
Geographic Keywords: United Kingdom
Taxonomic Keywords: Salmonidae; Salmo salar; Salmo trutta
Extent: 24; + appendices
Permalink: http://www.environmentdata.org/archive/fbalc:49
Total file downloads: 183
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