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Title: River Ribble juvenile fish stock assessment 2003, with particular reference to salmonids
Author: Environment Agency North West Region
Document Type: Monograph
Annotation: EA additional title info: May 2004
This report presents data from the juvenile salmonid stock assessment carried out on the River Ribble catchment in the summer of 2003. This survey forms part of the routine 5-year rolling programme of riverine stock assessments carried out by the Environment Agency's Ecological Appraisal Team for North West Region, Central Area. The survey is also used to assess annual variation (Temporal monitoring) at a small numbers of sites. The aim of this survey was to assess the distribution and abundance of juvenile salmon and trout in the River Ribble catchment in 2003 and to compare results with those from previous surveys. The new monitoring programme is divided into components clearly aimed at providing data of different types. The sites are split between the temporal and spatial components. Temporal elements of the programme will provide long term time-series data for specific sites and are to be sampled annually. The new national monitoring programme has therefore identified 11 sites on the Ribble which will be sampled on a yearly basis (Appendix 1). The sites are located primarily in spawning becks/areas so this will primarily assist in identifying different year class strengths and weaknesses from year to year. The spatial element of the monitoring is aimed at comparing groups of sites with similar habitat types or sub-catchments for example. These 50 spatial sites are to be surveyed at five-yearly intervals.
Publisher: Environment Agency
Publication Date: 2004
Publication Place: Preston
Subject Keywords: Fish (food)Stock assessment
Geographic Keywords: Ribble catchmentRibbleEA North West
Extent: 23; + appendices
Total file downloads: 257

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