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  • 1
    Electronic Resource
    Electronic Resource
    Spawning of farmed Atlantic salmon, Salmo salar L., in the second year after their escape (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 24 (1993), S. 0 
    Details
    ISSN: 1365-2109
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract. The frequency of escaped farmed salmon in the River Polla, Scotland was estimated at spawning in 1990, the second year after the escape of 184000 fish from a sea-cage site nearby. Fourteen of 73 spawners examined were of farmed origin. In only six of these fish were scale growth patterns consistent with their being part of the documented escape. All of these fish carried the pigment canthaxanthin. Fifty-nine redds were constructed at spawning. Five of 54 redds sampled contained embryos or alevins bearing canthaxanthin. The frequency of fry bearing canthaxanthin was determined in samples obtained from the neighbouring Rivers Hope and Dionard following spawning in both 1989 and 1990. There was no evidence of substantial returns of salmon from the documented escape to these rivers. These findings and those of a previous study suggest that more than 95% of those fish which returned to rivers near the site of the documented loss did so in the first year after escape and that fewer than 0·5% of those fish which escaped returned within the 2 years of study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2109.1993.tb00630.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    An experiment in the planting of Atlantic salmon, Salmo salar L., fry (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 23 (1992), S. 0 
    Details
    ISSN: 1365-2109
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract. During April 1989, approximately 45000 swim-up Atlantic salmon, Salmo salar L., fry were planted in the upper tributaries of the Lui Water, a tributary of the River Dee, north-east Scotland, at densities of between 2-6 and 3-3/m2. Adult salmon are normally excluded from this stream by a waterfall. In mid-August 1989. a 5-km length of stream was surveyed for juvenile salmon and it was estimated that about 230000+ salmon were present. It was estimated that 518% of the original planted fry survived from April to August 1989. A further survey in August 1990 showed that about 3400 1 + salmon remained. Of the 0 + salmon 14·5% survived from August 1989 to August 1990.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2109.1992.tb00781.x
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  • 3
    Electronic Resource
    Electronic Resource
    Spawning of escaped farmed Atlantic salmon, Salmo salar L., in western and northern Scottish rivers: egg deposition by females (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 24 (1993), S. 0 
    Details
    ISSN: 1365-2109
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract. In 1991, the progeny of female Atlantic salmon, Salmo salar L., were sampled at emergence from sites in 16 rivers in western and northern Scotland. The progeny of farmed females that had escaped from sea-cages were identified by detecting the presence of maternal canthaxanthin in the juveniles’ pigment load. Canthaxanthin was detected among fish sampled from 14 of the 16 rivers examined. Overall, 109 of the 2373 fry sampled carried canthaxanthin with an average frequency over all the rivers examined of 5·1%. This value will underestimate the real frequency of occurrence of the progeny of escaped farmed salmon: some escapees do not contain canthaxanthin and male fish do not contribute to the pigment load of their progeny.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2109.1993.tb00642.x
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  • 4
    Electronic Resource
    Electronic Resource
    Melanophore constellations allow robust individual identification of wild 0+ year Atlantic salmon (2005)
    Oxford, UK; Malden, USA : Blackwell Science Ltd
    Journal of fish biology 67 (2005), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Melanophore constellation patterns on the heads of 0+ year Atlantic salmon Salmo salar allowed robust identification of individuals, and were probably unique. Reliable identification was possible from shortly after emergence until at least 16 months later. The method for recording the patterns was inexpensive, required no special equipment and had no additional physical impact on the fish.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.0022-1112.2005.00730.x
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  • 5
    Electronic Resource
    Electronic Resource
    Egg survival and timing of hatch in two Scottish Atlantic salmon stocks (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 51 (1997), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Atlantic salmon eggs from the Rivers Oykel and Shin were monitored in three rivers and in culture. Significant mortality, attributable to low pH, was found for both stocks in the River Oykel though it was eightfold higher for the non-native Shin eggs. Shin eggs hatched earlier at all three wild sites but hatched later in culture. The observations are consistent with genotype-environment interactions for pH sensitivity and developmental rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1997.tb02527.x
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  • 6
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    The influence of riparian woodland on the spatial and temporal variability of stream water temperatures in an upland salmon stream (2004)
    Copernicus
    Details
    Publication Date: 2004-06-30
    Description: The spatio-temporal variability of stream water temperatures was investigated at six locations on the Girnock Burn (30km2 catchment), Cairngorms, Scotland over three hydrological years between 1998 and 2002. The key site-specific factors affecting the hydrology and climatology of the sampling points were investigated as a basis for physical process inference. Particular emphasis was placed on assessing the effects of riparian forest in the lower catchment versus the heather moorland riparian zones that are spatially dominant in the upper catchment. The findings were related to river heat budget studies that provided process detail. Gross changes in stream temperature were affected by the annual cycle of incoming solar radiation and seasonal changes in hydrological and climatological conditions. Inter-annual variation in these controlling variables resulted in inter-annual variability in thermal regime. However, more subtle inter-site differences reflected the impact of site-specific characteristics on various components of the river energy budget. Inter-site variability was most apparent at shorter time scales, during the summer months and for higher stream temperatures. Riparian woodland in the lower catchment had a substantial impact on thermal regime, reducing diel variability (over a period of 24 hours) and temperature extremes. Observed inter-site differences are likely to have a substantial effect on freshwater ecology in general and salmonid fish in particular. Keywords: temperature, thermal regime, forest, salmon, hydrology, Girnock Burn, Cairngorm
    Print ISSN: 1027-5606
    Electronic ISSN: 1607-7938
    Topics: Geography , Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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