Influence of river flow on rod catch of Atlantic salmon, Salmo salar L., from the lower River Derwent, north‐west England
Abstract Twenty‐seven years of daily salmon, Salmo salar L., rod catch and flow data from the River Derwent were analysed. Daily catch was standardized for each month between June and October and the mean value determined for each 2‐cumec flow band. In June and July the mean standardized catch remai...
| Published in: | Fisheries Management and Ecology |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Wiley
1995
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1111/j.1365-2400.1995.tb00100.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2400.1995.tb00100.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2400.1995.tb00100.x |
| Summary: | Abstract Twenty‐seven years of daily salmon, Salmo salar L., rod catch and flow data from the River Derwent were analysed. Daily catch was standardized for each month between June and October and the mean value determined for each 2‐cumec flow band. In June and July the mean standardized catch remained relatively low and stable for flows up to approximately 9 cumecs. Thereafter it increased steadily with increasing flow, reaching a peak at 21 cumecs and 41 cumecs for each month respectively. A linear model accounted for the greatest proportion of the variability in August and September with mean standardized catch increasing steadily up to a maximum value of 43 and 39 cumecs respectively. However, in October, a quadratic model was more appropriate, with mean standardized catch decreasing as flow increased up to 9 cumecs and thereafter increasing steadily with flow, reaching a maximum value at 21 cumecs. The pattern of the relationship at higher flows was not clear because of the paucity of data. These findings are discussed in relation to the management of the water resource for the maintenance of the fishery. |
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