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Title: Sea Trout Catch Statistics
Author: National Rivers Authority
Document Type: Monograph
Abstract:
The chief objectives were to assess the spatial and temporal variability of rod and commercial catches of sea-trout, Salmo trutta L., in the North West, Welsh, South West, Wessex and Northumbria (+ Yorkshire Esk) regions of the National Rivers Authority, to classify the major sea-trout rivers according to mean catch and variability in catch, and to identify rivers that do not fit into this scheme. The data base comprised annual rod catches from 67 rivers and annual commercial catches from 36 rivers in England and Wales. The analyses of spatial variability (variation in catches between rivers for each year) demonstrate that catches from different rivers in a region varied synchronously in time. The mean catch for all rivers in a region and the corresponding CV (Coefficient of Variation) therefore provide succinct summaries of temporal changes in catch size and the relative variability between catches from different rivers. The latter was fairly stable between years for catches from the North West, Welsh and South West regions, but varied considerably for catches from the Wessex and North East regions, usually reflecting the larger fluctuations in mean catch. Mean catch varied considerably between years in all regions and although 1989 catches were low in all except the North East, similarly low values have occurred in previous years. Although not used in the analyses, 1990 catches were included for comparison and were low compared with previous catches.
Publisher: National Rivers Authority
Publication Date: 1992
Publication Place: Bristol
Subject Keywords: River fisheriesTroutFishery statistics
Geographic Keywords: EnglandWales
Taxonomic Keywords: Salmo trutta
Extent: 43
Permalink: http://www.environmentdata.org/archive/ealit:3332
Total file downloads: 42

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