Randy,

I remember seeing a presentation on the energy expended by jumping
arrowana.  The presentation was at the 1996 ASIH meeting, but I haven't
seen any papers resulting from it.  The authors were Korff, Suter, and Long
from Vassar College.  You could try tracking them down, they might have
some ideas.

Good luck.

Tom

At 4/3/2002, Randy E Edwards wrote:
>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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Thomas P. Hurst
Behavioral Ecology Branch
Alaska Fisheries Science Center
NOAA - NMFS
Hatfield Marine Science Center
Newport, OR 97365
541-867-0222 office
541-867-0136 fax
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