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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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  • 4
    Electronic Resource
    Electronic Resource
    Studies on Overwinter Mortality of Autumn-stocked Rainbow Trout in some Lakes in Northern Ireland (1975)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 6 (1975), S. 0 
    Details
    ISSN: 1365-2109
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2109.1975.tb00149.x
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  • 5
    Electronic Resource
    Electronic Resource
    Recaptures of Tagged Rainbow Trout from some Lakes in Northern Ireland (1976)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 7 (1976), S. 0 
    Details
    ISSN: 1365-2109
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2109.1976.tb00186.x
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  • 6
    Electronic Resource
    Electronic Resource
    Fish population estimation: the use of rotenone to evaluate the reliability of a removal technique (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 16 (1985), S. 0 
    Details
    ISSN: 1365-2109
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract. The use of a large-meshed seine net (aperture 2–5 cm) in enclosed compounds was an effective method for the capture of large grass carp, Ctenopha-ryngodon idella (Val.), and tench, Tinea tinea L., with mean fork lengths of 42–9 cm and 38–3 cm and mean weights of 1–53 kg and 1–10 kg respectively. Calculated population estimates using a constant-effort removal technique showed a high degree of accuracy for grass carp, when the absolute index of population size was checked after completion of netting with an application of a commercially available rotenone formulation. It is suggested that this was so because of the large proportion (〉90%) of the total population netted. Large tench may be unsusceptible to rotenone at the low concentration of 0–5 ppm used, so no check on the accuracy of the population estimation was possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2109.1985.tb00077.x
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  • 7
    Electronic Resource
    Electronic Resource
    The Effects of a Land Drainage Scheme on the Salmonid Populations of the River Camowen, Co. Tyrone (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 14 (1983), S. 0 
    Details
    ISSN: 1365-2109
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Annual electro fishing surveys were carried out over an 11-year period at five sites on an upland river, which was subject to dredging operations in connection with a land drainage scheme. Four of the sites were dredged 3 years after the start of the survey and one control site remained undredged throughout. The results indicated that dredging operations initially reduced Salmonid densities and that there was subsequently a progressive downstream recovery, with fry densities taking up to 6 years to improve at the most downstream site. Yearling and older fish recovered to pre-drainage scheme levels more rapidly than fry.Changes in population structure were also observed at three of the dredged sites. Two sites were considerably deepened and finally contained larger numbers of older fish than prior to the drainage scheme. The opposite effect was found to have taken place at a site, which became shallower as a result of drainage works, and contained larger numbers of fry at the end of the survey.Increased fish growth rates were also observed at all sites over the experimental period, and this may have been correlated with enrichment of the river system by leaching from increased fertilizer usage within the catchments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2109.1983.tb00049.x
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  • 8
    Electronic Resource
    Electronic Resource
    Further note on the salmonid populations of the Lough Erne tributaries in Northern Ireland (1972)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 4 (1972), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Confirmatory evidence has been obtained that pre-spawning losses from ulcerative dermal necrosis (UDN) may have affected recruitment of salmonid stocks in the Lough Erne spawning streams during 1967/68.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1972.tb05647.x
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  • 9
    Electronic Resource
    Electronic Resource
    Behaviour of adult Atlantic salmon, Salmo salar L., in the estuary of the River Ribble in relation to variations in dissolved oxygen and tidal flow (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 33 (1988), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Twenty adult returning salmon were tracked in the estuary of the R. Ribble using acoustic oxygensensing transmitters during summer when a pronounced dissolved oxygen (DO) sag develops. Excluding two mortalities, 75% of these fish left the estuary to sea. Fish in the estuary moved to and fro with the tides over a 10 km amplitude experiencing cyclical changes in DO. Fish movement was inhibited below 40% of air saturation value (ASV) DO, and there was evidence of avoidance of DO below 55% ASV. The high rate of loss of fish to sea suggests that many of the fish in the estuary are non-Ribble fish en route to other rivers. Adverse conditions in the Ribble therefore are likely to affect stocks in adjacent rivers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1988.tb05567.x
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