Thackeray, Stephen and Grey, Jonathan and Jones, Roger (2000) Feeding selectivity of brown trout (Salmo trutta) in Loch Ness, Scotland. Freshwater Forum, 13, pp. 47-59.
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The aim of this study was to compare statistically the zooplankton assemblage ingested by brown trout (Salmo trutta) in Loch Ness with that of the zooplankton in the water column. This would allow the examination of the apparent paradox that very few copepods appear to be consumed by trout at a time of year when they are numerous and readily available as food. The investigation was limited to the crustacean zooplankters, since the Rotifera are generally so small that they are only of interest to fish in the first few days of life. 25 trout were obtained from anglers, and the stomach contents of non-"ferox" animals analysed. Samples of pelagic zooplankton were obtained approximately monthly from 30-m vertical net-hauls (mesh size 100 km). It is concluded that the variation in dietary composition with trout wet weight indicates an ontogenetic habitat shift producing spatial separation of young and older individuals.
|Title:||Feeding selectivity of brown trout (Salmo trutta) in Loch Ness, Scotland|
|Journal or Publication Title:||Freshwater Forum|
|Page Range:||pp. 47-59|
|Issuing Agency:||Freshwater Biological Association|
|Uncontrolled Keywords:||Feeding behaviour; Food organisms; Foraging behaviour; Freshwater crustaceans; Freshwater fish; Patchiness; Predation; Prey selection; Zooplankton; Scotland; Loch Ness|
|Depositing User:||Hardy B Schwamm|
|Date Deposited:||26 Nov 2010 13:39|
|Last Modified:||29 Sep 2011 18:11|
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