><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><>
If you reply to this message, it will go to all FISH-SCI members.
><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><>
Dear Christian,
A few suggestions for encouraging certain (stubborn) species to swim:
Moving Floors:
A few years ago, we discovered the benefits of equipping a flume with a continuously moving belt in the floor. The belt moves at the same speed and in the same direction as the water flow. The moving floor serves several purposes: 1) preventing negatively buoyant fish from settling on the floor of the chamber, 2) simulating ground passing under a swimming fish, and 3) maintaining uniformity of flow near the floor of the chamber thus preventing fish from taking advantage of reduced flow in that area. We found it worked particularly well for flatfish, which are often difficult to encourage to swim under laboratory conditions. See Winger et al. (1999, ICES J Mar Sci 56:252-265) for details, and more recently, research in Kurt Gamperl's lab at the Ocean Sciences Centre, Memorial University (http://www.ucs.mun.ca/~kgamperl/).
Tilting Flumes:
Priede and Holliday (1980, JEB 85:295-309) developed a tilting Brett-type respirometer to test the critical swimming speed and oxygen consumption of North Sea plaice. The chamber was actually tilted forward at an angle of about 60 degrees, forcing the fish to slip off the bottom and swim in a downhill direction. Duthie (1982, JEB 97:359-373) later used the same device to investigate the swimming capability of European flounder, common dab, and lemon sole.
Electricity:
Depending on the study and its application, electricity is still an acceptable means in my opinion of encouraging fish to swim, particularly when interested in questions of endurance related to mobile fishing gears. Of course, certain care must be taken in choosing the appropriate voltage, current, electrode material, and shock frequency. An excellent resource on flume design is Bell and Terhune (1970, Fish. Res. Bd. Can. Tech. Rep., No. 195).
Best Regards,
Paul
Paul D. Winger, PhD
Centre for Sustainable Aquatic Resources
Fisheries and Marine Institute
Memorial University of Newfoundland
P.O. Box 4920, St. John's, NL, Canada, A1C 5R3
Tel: (709) 778-0678
Fax: (709) 778-0661
http://www.mi.mun.ca/csar
-----Original Message-----
From: Scientific forum on fish and fisheries
[mailto:[log in to unmask]]On Behalf Of Christian Tudorache
Sent: Tuesday, June 15, 2004 7:22 AM
To: [log in to unmask]
Subject: Bullhead
><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><>
If you reply to this message, it will go to all FISH-SCI members.
><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><>
Dear all,
I am doing swimming tunnel experiments with different European freshwater
species an try to determine data like maximal swimming speed, maximal
velocity etc. All my fish tend to cooperate quite well, only the bullheads
seem to be a little "lazy". What can I do to motivate them without using
electroshocks?
Thanks a million,
Christian
----------------------------------------------------------------------------
-------------------
Christian Tudorache
Laboratory for Ecophysiology, Biochemistry and Toxicology
Department of Biology
University of Antwerp
Groenenborgerlaan 171
2020 Antwerp
Belgium
tel. +32 (0)3/265.32.32
fax. +32 (0)3/265.34.97
e-mail : [log in to unmask]
website : www.ecotox.be
----- Original Message -----
From: "PETE LIPTROT" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, June 15, 2004 9:51 AM
Subject: Re: R. Froese
> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><>
> If you reply to this message, it will go to all FISH-SCI members.
> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><>
>
> I am looking for the Email address of "R. Froese", can anyone there help?
>
> I believe that Rainer moderates on the Fishbase Forum, if you put a query
on there you should get a quick response.
>
> Pete
>
> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><>
> To leave the Fish-Sci list, Send blank message to:
> mailto:[log in to unmask]
> For information send INFO FISH-SCI to [log in to unmask]
> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><>
>
><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><>
To leave the Fish-Sci list, Send blank message to:
mailto:[log in to unmask]
For information send INFO FISH-SCI to [log in to unmask]
><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><>
><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><>
To leave the Fish-Sci list, Send blank message to:
mailto:[log in to unmask]
For information send INFO FISH-SCI to [log in to unmask]
><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><>
|
