Experiments on downstream movement of recently emerged trout and salmon parr in Grassholme channels, 1983-1985

Crisp, D.T. (1985) Experiments on downstream movement of recently emerged trout and salmon parr in Grassholme channels, 1983-1985. Ambleside, UK, Freshwater Biological Association, 37pp. (WIT/73/29).

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Abstract

A number of authors have described the manner in which young salmonids, soon after emergence from the gravel, set up and defend territories. This leads to mortality or downstream displacement of the individuals which are unable to acquire territories and is widely accepted as the main method of population regulation amongst young salmonids. In some field experiments the fish were constrained in screened reaches and the option of downstream dispersal for the surplus fry was thus excluded. In order to explore some aspects of downstream dispersal more closely under conditions which gave more control than is obtained in a natural stream, four experimental channels were set up at Grassholme reservoir in Teesdale. The report describes the results of investigations on the timing and rate of downstream movement of young brown trout (Salmo trutta L.) and Atlantic salmon (Salmo salar L.) out of experimental channels, with special reference to the effect of water velocity on the rate of ”emigration”.

Item Type: Monograph or Serial Issue
Title: Experiments on downstream movement of recently emerged trout and salmon parr in Grassholme channels, 1983-1985
Personal Creator/Author:
CreatorsEmail
Crisp, D.T.
Number of Pages: 37
Date: 1985
Publisher: Freshwater Biological Association
Place of Publication: Ambleside, UK
Issuing Agency: Freshwater Biological Association
Uncontrolled Keywords: Freshwater fish; Experimental data; Survival; Juveniles; Territoriality; Catadromous migrations; Current velocity; England; Grassholme Reservoir
Subjects: Ecology
Fisheries
Limnology
Item ID: 5218
Depositing User: Hardy B Schwamm
Date Deposited: 28 Apr 2011 16:33
Last Modified: 29 Sep 2011 15:12
URI: http://aquaticcommons.org/id/eprint/5218

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