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The growth of juvenile atlantic salmon salmo salar l. and brown trout salmo trutta l. in a scottish river system subject to cooling water discharge



The growth of juvenile atlantic salmon salmo salar l. and brown trout salmo trutta l. in a scottish river system subject to cooling water discharge



Journal of Fish Biology 35(4): 539-556



The River Fiddich, a tributary of the R. Spey in north-east Scotland [UK], is a spawning river for both Atlantic salmon and brown trout. Warm cooling water effluent is discharged from several distilleries at different points in the lower reaches and raises the temperature of the river 1-3.degree. C above ambient for most of the year. Salmon and trout grow more rapidly in this region than further upstream, and juvenile salmon generally migrate a year earlier, as 2+ smolts. Available data were too few to determine whether there was a similar difference for trout. Similar studies on the R. Dullan, a tributary of the Fiddich, and on the Cromdale Burn in the same area, confirmed that the growth rate of fish is faster downstream from distillery discharge points. It is suggested that increased invertebrate production may influence the growth rate.

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Accession: 007904232

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