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Subject: Re: Energetics of Fish Jumping
From: "Brady, Steve" <[log in to unmask]>
Reply-To:Scientific forum on fish and fisheries <[log in to unmask]>
Date:Wed, 3 Apr 2002 14:58:02 -0800

text/plain (68 lines)

Check out this website and you can contact some of the researchers.

Steve Brady
Environmental Specialist
Storm Water Management
Public Works Department
City of Santa Rosa
69 Stony Circle
Santa Rosa, CA 95401
(707) 543-3919
(707) 543-3801 fax
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-----Original Message-----
From: Randy E Edwards [mailto:[log in to unmask]]
Sent: Wednesday, April 03, 2002 2:38 PM
To: [log in to unmask]
Subject: Energetics of Fish Jumping

Fellow fish scientists,

I am going to try one more time, not having much success or response to my
last question to the forum (more on that later).

This is a new issue/question.  Does anyone have any information or leads to
information that could be used to estimate the energetics/energy cost of
fish jumping?  A rough estimate could be obtained from knowledge of burst
swimming, because a fish has to attain velocity that will propel it a
certain distance above the water.  However, I have not been able to find
literature on that either.

The issue can be posed another way.  The potential energy (PE) change
associated with a fish reaching a height (say, center of mass reaching some
number of body lengths above the water) is easy to calculate.  The question
is:  What is the ratio of PE to the actual kinetic energy expended to
overcome friction and other losses (e.g., inefficiency of tail thrust
during acceleration  = "cavitation")?  Does a fish have to expend 5X , or
10 X, or 20 X the  PE change in order to jump?  Perhaps someone can offer
"estimates" based on fluid dynamics considerations.

All suggestions will be greatly appreciated,

Randy E. Edwards, Ph.D.
Research Fish Ecologist

USGS-BRD-FCSC/Univ. of South Florida College of Marine Science
Center For Coastal & Regional Marine Studies
600 Fourth Street South
St. Petersburg, FL 33701-4846
Phone:  727/803-8747 (x3069)
FAX: 727/803-2031
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