Re: NANFA-- FW: Osmoregulation in freshwater sharks

Nick Zarlinga (njz_at_clevelandmetroparks.com)
Sat, 19 Jan 2002 15:32:34 -0500

Jeremy, I am a bit confused by your theory. I am still not quite sure
about your explaination of the correlation between the effects of
differences in salinity and the disease Myelinolysis. You seem to be going
way out on a limb here. There are many different kinds of fish which move
freely between marine and freshwater environments with no behavioral
changes. As a matter of fact, most marine animals can be acclimated to
lower salinity environments. I need to have more info in order to go along
with your theory. Bull sharks are notorious for being unpredictable even in
areas where they do not migrate into freshwater. Unfortunately, I do not
have the information on the scientists that you requested. Good luck!

Nick Zarlinga
Aquarium Biologist
Cleveland Metroparks Zoo

----- Original Message -----
From: Jay DeLong <thirdwind_at_att.net>
To: NANFA <nanfa_at_aquaria.net>
Sent: Friday, January 18, 2002 1:12 AM
Subject: NANFA-- FW: Osmoregulation in freshwater sharks

> The message below is from a webpage visitor. I don't understand
completely
> what he is asking for, but maybe someone has some ideas or contacts for
him.
>
> --
> Jay DeLong
> Olympia, WA
>
>
> -----Original Message-----
> From: Djsmiseth_at_aol.com
> Sent: Thursday, January 17, 2002 6:46 PM
> To: thirdwind_at_att.net
> Subject: Osmoregulation in freshwater sharks
>
>
> Hello my name is Jeremy Smiseth. I am a student at Rondout Valley
> Central School in New York. I am in a college course called Authentic
> Science
> Research. I have been studdying the topic of osmoregulation for quite
> sometime now. I am interested in the Bull Shark. As you may know it
> possesses
> the ability to move from saltwater to freshwater freely. I have come up
with
> an original hypothesis. My thoughts are that Aggression is triggered by
> changing from a high concentration of salt to a lower concentration of
salt.
> I beleive that the imbalance of salt can cause them to go into a frenzy.
By
> changing from a low salinity to a high would cause the same effect. The
> disease Myelinolysis is caused by curing Hyponatremia at a rate higher
than
> 10 mmol/l per a 24 hour period. Myelinolysis can cause dizziness and
> disoreantation. I think the salt concentration might have a similar effect
> in
> sharks.
>
> If it wouldnt take so much time could you email me back a list of
> researchers that worked with you or you received information from to write
> the email. I would like to thank you for taking your time to read my
email.
>
>
>
>
>
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/ For more information about NANFA, visit our web page, http://www.nanfa.org