Re: NANFA-- conservation status of SE fishes
Wed, 11 Oct 2000 12:02:23 EDT

In a message dated 10/11/00 9:06:08 AM Eastern Daylight Time,

<< << Every now and again the papers have something about a dead shark being
in Lake Michigan. >>
Not too many million years ago shark were much more wide spread in freshwater
than now, even living in cypress swamp type habitats. The spiny dogfish shark
is it's closest relative but acted much more like the great white with a
mouth full of teeth. I have been searching the net for someone to talk to
concerning ancient sharks but the subject seems to have no champion and the
information is chopped up into small bits and pieces. At this time only one
and maybe two species of shark are known to spend much time in freshwater, I
have an old reference that disputes that but I yet to find anyone who can
shed any light on it. Of the two now know known one is considered a true
freshwater shark only visiting marine waters occasionally but it's status is
doubt and may be just a sub species of bullshark the other shark that spends
considerable time in warm freshwater. Although several can make a freshwater
run when the mood hits them.


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