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Subject: Re: Prey swimming speeds
From: "Jeffrey A. Tyler" <[log in to unmask]>
Reply-To:Academic forum on fisheries ecology and related topics <[log in to unmask]>
Date:Fri, 13 Jun 1997 16:26:40 -0400

TEXT/PLAIN (47 lines)

        When Kenny Rose and I were doing such models as parts of larger
IBMs for YOY fish with flounder, yellow perch, walleye etc. we made the
assumption that in relation to the swimming speed of a YOY fish, a
zooplanktor's movement was essentially nil.  Thus in our enounter rate
models we only considered the speed at which the forager moved and didn't
worry about the movement of the zooplankton.  I don't think that any of
our reviewers had any prolem with that assumption.
        If you're unwilling to accept that assumption, I think that you
could make a reasonable assumption of zoop moving at one body length per
sec.  For zoop, then that would give you swimming speeds of about 0.5 to
5.0 mm/s depending on the size of your zoop.  If you use the Gerritsen &
Strickler (1977) equations to calculate an enounter rate (see also Bailey
& Batty 1983 or a version that is in one of my recent papers, Tyler &
Rose 1997, J.Anim.Ecol 66:122) then I think that you'll find little
difference in encounter rates if the range of prey movement is 0.5 to 5.0


On Fri, 13 Jun 1997, Thomas Miller wrote:

>         I am trying to model encounter rates of YOY fish with their prey
> and am finding myself limited in the number of zooplankton prey taxa that
> I can find information on swimming behaviour.  Any suugestions on
> references I might look at would be appreciated.
>         If you reply to me directly,  I will post a summary to the list at
> a later date.
> Thanks in anticipation
> Tom Miller

Jeffrey A. Tyler, Ph.D
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