Feeding selectivity of brown trout (Salmo trutta) in Loch Ness, Scotland

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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Abstract

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.

Item Type: Article
Title: Feeding selectivity of brown trout (Salmo trutta) in Loch Ness, Scotland
Personal Creator/Author:
CreatorsEmail
Thackeray, Stephen
Grey, Jonathan
Jones, Roger
Refereed: No
Journal or Publication Title: Freshwater Forum
Volume: 13
Page Range: pp. 47-59
Date: 2000
ISSN: 0961-4664
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
Subjects: Ecology
Biology
Limnology
Item ID: 4601
Depositing User: Hardy B Schwamm
Date Deposited: 26 Nov 2010 12:39
Last Modified: 29 Sep 2011 16:11
URI: http://aquaticcommons.org/id/eprint/4601

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