A comparative analysis of aggression in migratory and non-migratory salmonids |
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Authors: | Michael J Hutchison Munehico Iwata |
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Institution: | (1) Nikko Laboratory, National Research Institute of Aquaculture, Chugushi, Nikko, Tochigi, 321-16, Japan;(2) Present address: Royal Australian Ornithologists Union, GPO Box 3943, Sydney, 2001, Australia;(3) Present address: Laboratory of Ecophysiology, School of Fisheries Sciences, Kitasato University, Iwata, 022-01, Japan |
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Abstract: | This paper represents a comprehensive test of the hypothesis that aggression in salmonids increases with the duration of stream residence. The intraspecific aggression of eleven juvenile salmonids was compared with their normal duration of stream residence. Salmonids maintained in 1 metre tanks and observed over two days could be separated into four groups based on statistical differences between the frequencies of aggressive behaviour. Non-anadromous Salvelinus fontinalis showed the highest levels of aggressive behaviour, followed by Oncorhynchus masou and O. mykiss (rainbow and steelhead trout). Least aggressive were the early migrants O. nerka (kokanee and sockeye salmon) and O. keta. The remaining species, O. rhodurus, O. kisutch, S. leucomaenis pluvius and Salmo trutta formed a moderately aggressive group. Aggressiveness was significantly and positively correlated with the duration of stream residence. |
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Keywords: | territorial behaviour stream residence anadromy salmonidae fishes |
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