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"J.W.Tang" <[log in to unmask]>


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Wed, 31 Jul 1996 17:38:00 +0100





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Hey Toby!
You finally finished at last!
Did you manage to get any results from your artificial flow tank? I
have just received my medical degree and start on the cardiology ward
next week (cardiac arrests and angioplasty etc.). Dealing with fish
is a damn sight easier than dealing with people, but if you have to
deal with people, they are easier to handle if they are ill ....
I have always been more interested in the basic science of fluid
flows in biological systems (swimming fish, blood flow and heart
disease - athersclerosis), but the problems are still almost
intractable - unfortunately you cannot cut people open under general
anaesthesia to observe flow patterns in arteries in situ....
I have been over to Canada on research electives - once as part of
the medical course at McGill University Clinic in Montreal (during
last winter -30 degrees to around -10), looking at flow and adhesion
between protein coated latex beads, in simulated flows. In Nova
Scotia, Antigonish, St. Francis Xavier University with Edwin DeMont,
who is really more interested in cartilage and soft tissue mechanics
than fish dynamics. I worked with a freshman for just one month
trying to measure the Young's Modulus (static) of bending dead
whole trout (i.e.with skin, muscle, bone all intact), i.e. did the
stiffness vary with the degree of lateral bending? We performed these
measurements at 5, 10, 15 degrees C. It took us 2 weeks to design and
construct the apparatus and 2 weeks to collect the data, working
every day (no weekends off). The data was sketchy at best, but it
seems workable. The values were scattered but seemed to be between
1000-10000 N/sq.m. Jianyu Cheng who has been to biomechanics
conferences in Leeds several times, formulated a model for
us, but our data was too sketchy to apply it - with the
approximations of geometry in the model, the results would have
been too inaccurate. He was on a 2 year fellowship with Edwin
DeMont, but is now working for an oil company in Houston Texas. No
one funds such esoteric research on a long term basis - he was
modelling scallop swimming with Edwin.
It sounds like your work is applied again. I have been back to Canada
a few times to keep in touch with various possible future research
contacts and I am taking the USA medical exam this summer (it is
tough! and costs $480 for each of the 3 steps to qualify in the US).
But I would like to get back to basic reseach again eventually.
Working with sick and well people all day is too tiring!
Say Hi to Monty and Clem for me - has Sarah also finished?
(How long/heavy was your thesis in the end?)
Date sent: Mon, 29 Jul 1996 17:11:37 +0100
Send reply to: Academic forum on fisheries ecology and related topics
                <[log in to unmask]>
From: "t.j.carter" <[log in to unmask]>
To: Multiple recipients of list FISH-ECOLOGY <[log in to unmask]>
** HELP ** Information Required
Does anyone out there have any information about FISH WHEELS they could let me
know about? I already know that they were used until 1974 on the River Rhone,
and possibly the River Garonne, in France, to catch shad (Alosa sp.). They
were also used on the Tiber in Rome until the 1950's. In America, fisheries
biologists in the Alaska and Yukon are reputed to use them for sampling,
although their commercial use has been banned. As far as I know they are also
used on the Columbia River in Oregon. The latest information I have is from
von Brandt (1984) in Fishing methods of the world and may not be up to date.
If anyone out there has used fish wheels, or even better is using them,
either commercially or for research, I would appreciate hearing from you.
I am particularly interested in information about CATCHING EFFICIENCY, DESIGN,
DAMAGE TO FISH DURING CAPTURE, CURRENT USES etc. and would be grateful for
information, references or contact names.
E-mail me direct (don't swamp Fish-Ecology) at
[log in to unmask]
or write to
Dr. T J Carter
Department of Zoology
University of Aberdeen
Tillydrone Avenue
Aberdeen, UK

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