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Dear Christian - A number of years ago we published some swimming
respirometry experiments on Cottus bairdi (Facey, D. E., and G. D.
Grossman. 1990. The metabolic cost of maintaining postion for four North
American stream fishes: effects of season and velocity. Physiol. Zool.
63:757-776; Facey, D. E., and G. D. Grossman. 1992. The relationship
between water velocity, energetic costs and microhabitat use in four
North American stream fishes. Hydrobiologia 239:1-6) -- you might find
these papers of interest if you haven't seen them yet. I would question
why you are trying to make a fish that normally sits on the bottom swim
in the water column for physiological measurements. How ecologically
realistic is this, or are you doing it for some other purpose. Just as
an aside, we found that C. bairdi was capable of holding position at
quite high velocities in a smooth plexiglass swimming tube -- they
change the angle of their large pectoral fins to create a net downward
force. I wouldn't be surprised if C. gobio displayed the same behavior.
I'll be out of town for the next several days so if you write me
directly expect a slightly delayed answer <g>. cheers, g2
--
Gary D. Grossman
G. Grossman Fine Art
http://www.negia.net/~grossman
Professor of Animal Ecology
http://www.arches.uga.edu/~grossman
Board of Editors - Animal Biodiversity and Conservation
Editorial Board - Freshwater Biology
Editorial Board - Ecology Freshwater Fish
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