Randy,

I'm aware of a radio telemetry tag (EMG) that is being used in the Columbia
River system on a few projects that is designed to measure energy costs
associated with upstream migration in the mainstem or at migration
"bottlenecks" such as a falls.  I've cc this to David Geist, with PNL who is
familar with this research.

Joel Hubble

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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