An analysis of migratory salmonid catch effort data, derived from anglers' log books, 1991

Aprahamian, M.W. (1993) An analysis of migratory salmonid catch effort data, derived from anglers' log books, 1991. Warrington, UK, National Rivers Authority North West, 89pp.

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Abstract

1000 log books were issued to anglers of which 236 were returned, those from the rivers Derwent, Kent, Lune and Ribble accounted for the vast majority. The Derwent had the highest catch rate of these rivers: one salmon every 13.89 hours followed by the Lune, Kent and Ribble at 16.39, 18.87 and 35.71 hours, respectively. For sea trout the Lune, Derwent and Ribble had a catch rate of approximately one fish every 10.0 hours (9.8, 10.0 and 10.64 hours),and for the Kent one fish per 16.1 hours fished. Salmon angling visits were, in general,longer than those for sea trout being between 2 and 6 hours as opposed to 2 to 4 hours. On the majority of visits (>80%) no fish were caught and was the same for salmon and sea trout. For salmon the majority of fish were caught on fly, spinner or worm, and the least on prawn. For sea trout fly predominated. The majority of salmon caught were less than 91b in weight and were presumed to be grilse (1 sea winter). The majority of the sea trout caught weighed between 1 and 31b. The pattern of catch, effort, CPUE, abundance and catchability for salmon and sea trout were modelled using the data from the rivers Derwent, Kent and Lune. Flow significantly influenced catch, effort and catchability of salmon which had entered in a particular month. For sea trout flow was not significantly correlated with any of the dependent variables. The catchability coefficient for salmon, determined from the total number of fish, remained relatively constant over the period June to October indicating that CPUE was a reasonable measure of within season abundance. This was not found to be the case for sea trout.

Item Type: Monograph or Serial Issue
Title: An analysis of migratory salmonid catch effort data, derived from anglers' log books, 1991
Personal Creator/Author:
CreatorsEmail
Aprahamian, M.W.
Number of Pages: 89
Date: April 1993
Publisher: National Rivers Authority North West
Place of Publication: Warrington, UK
Funders: Environment Agency Archives North West
Contact Email Address: dis@fba.org.uk
Issuing Agency: Environment Agency, UK (Freshwater Biological Association)
Uncontrolled Keywords: England; Rivers; Logbooks; Salmo salar; Salmo trutta; Salmon fisheries; Catch statistics; Catch/effort; Weight; River fisheries
Subjects: Fisheries
Limnology
Item ID: 8082
Depositing User: Hardy B Schwamm
Date Deposited: 01 Mar 2012 17:34
Last Modified: 01 Mar 2012 17:34
URI: http://aquaticcommons.org/id/eprint/8082

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