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  • 1
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    Information collected in Teesdale concerning free-swimming stages of brown trout (Salmo trutta L.) (2021)
    Freshwater Biological Association | Ambleside (UK)
    In:  http://aquaticcommons.org/id/eprint/5085 | 1256 | 2011-09-29 15:25:34 | 5085 | Freshwater Biological Association
    Details
    Publication Date: 2021-07-08
    Description: During 1978 and 1979, electrofishing surveys were made in Teesdale - both to provide background information for ecological work on the streams, and to provide data so that the influence of discharge regime on the fish population densities could be examined. The discharge regimes of the different streams were compared using the Base Flow Index (BFI) as developed by the Institute of Hydrology. (PDF contains 30 pages)
    Keywords: Biology ; Ecology ; Limnology ; Freshwater ecology ; Rivers ; Freshwater fish ; Electric fishing ; Fry ; Population density ; Flow measurement ; Salmo trutta ; Cottus gobio ; Phoxinus phoxinus ; Nomacheilus barbatulus ; England ; Teesdale
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
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  • 2
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    The temperatures of four Pennine streams (2021)
    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5082 | 1256 | 2011-09-29 15:26:18 | 5082 | Freshwater Biological Association
    Details
    Publication Date: 2021-07-08
    Description: Four streams in Teesdale (UK) were studied over a period of two years. The biological implications were studied by using the stream temperatures to predict both the times of brown trout eggs to hatching. Intragravel and stream water temperatures were compared for a spawning riffle in Great Eggleshope Beck. The effect of vegetation shading on water temperature was studied at Thorsgill Beck, which runs through deciduous woodland. An analysis was made of the time of day at which the maximum and minimum temperatures occurred in Carl Beck. Methods of calculating mean daily temperatures were examined. Estimations using the mid-point of the maximum/minimum range were usually higher than those from hourly temperature readings. (PDF contains 34 pages)
    Keywords: Biology ; Ecology ; Limnology ; Limnological surveys ; Freshwater ecology ; Freshwater fish ; Rivers ; Temperature data ; Temperature measurement ; Spawning ; Hatching ; Shading ; Salmo trutta
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
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  • 3
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    Some observations on washout of brown trout (Salmo trutta L.) eggs in Teesdale streams (2021)
    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5089 | 1256 | 2011-09-29 15:25:29 | 5089 | Freshwater Biological Association
    Details
    Publication Date: 2021-07-08
    Description: Brown trout (Salmo trutta) in Teesdale lay their eggs in the streambed gravels in the Autumn, here the eggs slowly develop to emerge as young fry in the Spring. Whilst the eggs are in the gravel they are vulnerable to displacement by high water velocities. Eggs removed in this way are not thought to remain viable since they are very susceptible to death through physical shock - especially in the earlier stages of development. Streams in Teesdale are known to be amongst the most flashy in England and thus are good sites in which to study egg washout. Three field sites were used for the study of egg washout in Teesdale - Great Eggleshope, Thorsgill and Carl becks. This report describes preliminary studies of a varied nature into this subject from which an attempt is made to assess the importance of egg washout to the survival of brown trout in Teesdale.
    Keywords: Biology ; Ecology ; Limnology ; Freshwater ecology ; Rivers ; Freshwater fish ; Fish eggs ; Survival ; Fry ; Population density ; Spawning ; England ; Teesdale
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 20
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