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  • 1
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    Acid waters in North West England. The effect of liming agricultural land (2021)
    National Rivers Authority | Warrington, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10961 | 1256 | 2013-03-26 13:55:26 | 10961 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-25
    Description: This is the Acid waters in North West England: The effect of liming agricultural land on the chemistry and biology of the River Esk, North West England report produced by National Rivers Authority in 1992. This report focuses on the study of Acid Waters in the North West Region of England, UK, which began in 1982 and sampling was completed in October 1990. This work was initiated because of the observation of the simultaneous mortality of adult and juvenile salmon and sea-trout in both the River Esk and adjacent River Duddon in June 1980. Investigations at that time indicated that an "acid episode" was the most likely cause of this mortality. A land use study indicated that a reduction in agricultural liming may have been a major factor in the development of acid episodes and consequent fish kills in the River Esk and River Duddon. However there was no evidence that the mortalities of salmonids in the early 1980's were due to a reduction in agricultural liming. They were due to some other phenomenon such as a period of intense acid deposition.
    Description: Environment Agency Archives North West
    Description: +appendices
    Keywords: Fisheries ; Limnology ; Management ; England ; North West ; Esk ; Inland waters ; Rivers ; Freshwater pollution ; Freshwater fish ; Migratory species ; Fish counter data ; Mortalities ; Invertebrates ; Acid Waters ; Water quality
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 31
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  • 2
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    The assessment of the flow requirements for upstream migration of salmonids in some rivers of North West England (2021)
    North West Water Authority | Warrington, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10975 | 1256 | 2013-03-26 13:52:48 | 10975 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-25
    Description: This is the assessment of the flow requirements for upstream migration of salmonids in some rivers of North West England produced by the North West Water Authority in 1985. This report focuses on the automatic fish counters operating on the resistivity principle used for several years in North West England. This report aims to investigate the flow requirements for upstream migration of salmon and migratory trout. The data obtained confirmed that during summer months most fish movement occurs in the higher range of the available flows, but the migration flow range varied from year to year, depending on prevailing river levels. Of the other environmental variables measured, only water temperature and incident light intensity appear to have any direct association with fish movement. Information on migration flow ranges were used in conjunction with computer simulations of the effects of abstraction proposals on historical flows to assess the implications of these proposals for migratory fish.
    Description: Environment Agency Archives North West
    Description: +1figure
    Keywords: Fisheries ; Limnology ; Management ; England ; North West ; Inland Water ; Rivers ; Fish counters ; Fish populations ; Migratory species ; Water quality
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 10
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  • 3
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    Episodic variations in stream water chemistry associated with acid rainfall and run-off and the effect on aquatic ecosystem, with particular reference to fish populations in N.W. England (2021)
    North West Water Authority | Warrington, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10976 | 1256 | 2013-03-26 13:52:30 | 10976 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-25
    Description: This is the episodic variations in stream water chemistry associated with acid rainfall and run-off and the effect on aquatic ecosystems, with particular reference to fish populations in North West England produced by the North West Water Authority in 1985. This report looks at the biological, physical and chemical information collected over a five year period from over 100 sites on upland streams in the North West Region of which drained rocks of low buffering capacity. In both Lake District and South Pennine sites striking differences were found between the composition of invertebrate communities inhabiting acid-stressed and less acid-stressed streams. Electric fishing surveys showed that acidic streams (geometric mean pH 〈5.5) generally had abnormally low densities of salmonids ( 〈 0 .2m2) and that 0+ fish were very few or absent. The latter indicates recruitment failure. Salmon were more sensitive than trout to low pH.
    Description: Environment Agency Archives North West
    Description: +9appendices
    Keywords: Fisheries ; Limnology ; Management ; England ; North West ; Inland Water ; Rivers ; Fish populations ; Migratory species ; Fish counters ; Fish surveys ; Population dynamics ; Mortalities ; Invertebrates ; Acid rainfall ; Freshwater pollution ; Pollution effects ; Water quality ; Water monitoring
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 55
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