Report on an egg bioassay experiment

National Rivers Authority (1995) Report on an egg bioassay experiment. Preston, UK, National Rivers Authority North West, 12pp.

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In October 1992, a fish population survey of the Swanside Beck system revealed that the densities of juvenile salmon present in the beck were generally poor. The survey highlighted that a potential reason for this may be due to a lack of spawning substrate resulting from siltation. Numerous workers have found that increased levels of A salmonid egg box experiment of Swanside Beck carried out in the spring of 1994, revealed that the survival rates in the majority of sites were good. While the in-site variability was relatively high, mean survival rates remained in excess of 70%. As a result egg survival rates were eliminated as the reason for low juvenile salmonid production. The only site with a relatively low survival rate was Swanside Beck downstream of Cowgill Beck. However, even at this site siltation was eliminated as the cause of the increased mortality rate. It is recommended that a salmonid stocking of Swanside Beck should be carried out this year. This should be followed by an electric fishing survey to evaluate juvenile salmonid survival rates.

Item Type: Monograph or Serial Issue
Title: Report on an egg bioassay experiment
Corporate Creator/Author: National Rivers Authority
Number of Pages: 12
Date: 1995
Publisher: National Rivers Authority North West
Place of Publication: Preston, UK
Funders: Environment Agency Archives North West
Issuing Agency: Environment Agency, UK (Freshwater Biological Association)
Uncontrolled Keywords: England; Ribble Catchment; Salmon fisheries; Fry; Survival; Stocking (organisms); Silting
Subjects: Ecology
Item ID: 8079
Depositing User: Hardy B Schwamm
Date Deposited: 17 Feb 2012 13:40
Last Modified: 17 Feb 2012 13:42
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