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Hi Randy.
Interesting. I've got 6 juveniles in my tank now, and I'm going to spend
some time watching.....
We're looking for juv. tarpon nursery marshes around the entire state of FL.
Do you by any chance know any
juv. habitats on the west coast, or have some colleagues who might have seen
juvenile tarpon in some of the marshes/impoundments and other stagnant
habitats?
Thanks!
Jon
----- Original Message -----
From: "Randy E Edwards" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, October 10, 2002 1:50 PM
Subject: Re: dorsal filaments?
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> Jon,
>
> Here is an off-the-wall-hypothesis for you: Several species with dorsal
> filaments (tarpon, threadfin herring, threadfin shad) exhibit similar
> "rolling" behaviors, in which the fish come to the surface and some of the
> fish's dorsal surface is momentarily out of the water. Could it be that
> filaments on the dorsal fin provide some control during such "rolls" ?
>
> Randy E. Edwards, Ph.D.
> Research Fish Ecologist
>
> USGS-BRD-FCSC
> Center For Coastal & Regional Marine Studies
> 600 Fourth Street South
> St. Petersburg, FL 33701-4846
> Phone: 727/803-8747 (x3069)
> FAX: 727/803-2031
> [log in to unmask]
>
> Do not tell fish stories where the people know you; but particularly,
don't
> tell them where they know the fish. [Mark Twain]
>
>
>
> Jon Shenker
> <[log in to unmask] To:
[log in to unmask]
> > cc:
> Sent by: Subject: dorsal filaments?
> Scientific forum
> on fish and
> fisheries
> <FISH-SCI@SEGATE
> .SUNET.SE>
>
>
> 10/08/02 04:02
> PM
> Please respond
> to Scientific
> forum on fish
> and fisheries
>
>
>
>
>
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> An off-the-wall question:
>
> Does anyone have any good hypotheses about the function of the elongated
> dorsal filaments that are found in some fish species?
>
> In the lower teleosts:
> Tarpon have very long filaments, ladyfish don't.
> Shafted bonefish (Albula nemoptera) has the dorsal filament, bonefish (A.
> vulpes) don't.
> Three or four North American clupeids have filaments, the rest don't.
>
> In the elasmobranchs, many species have some sort of elongation of the
> dorsal fin beyond the fin base, but the fin seems elongated into distinct
> filaments in hammerhead, bonnetheads and others.
>
> A hydrodynamic function? Maybe in elasmos, who have larger, stiffer
> filaments, but in the slender , flexible filaments of teleosts?
> Why would some closely-related species have them, and others not?
>
> Would removing a portion of the dorsal filament of a tarpon (for DNA
> analysis) have an impact on the fish?
>
> Any information or speculation would be welcome.
>
> On another note: My old copy of Reuben Lasker's (ed.) Marine Fish Larvae
> has finally been shredded beyond repair before I found time to photocopy
> it.
> It's an oldie but a goodie for helping students get started in the larval
> fish field. I haven't had any luck finding a copy for sale in the used
> book
> web sites. If anyone sees a copy for sale, please let me know.
>
> Thanks.
>
> Jon Shenker, Ph.D.
> Associate Professor of Marine Biology and Aquaculture
> Department of Biological Sciences
> Florida Institute of Technology
> 150 West University Boulevard
> Melbourne, FL 32901
> 321-674-8145
> FAX 321-674-7238
> [log in to unmask]
>
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