Re: NANFA-L-- Re: Chinese Sturgeon on AquaBid

anutej-in-loxinfo.co.th
Tue, 16 May 2006 00:36:55 +0700

Is batrachus still common in FL? And does it spread to other regions?

Tony

dlmcneely-in-lunet.edu wrote:
>
> Clarius batrachus was established in Florida after escaping from the
> aquarium trade.
>
> David L. McNeely, Ph.D., Professor of Biology
> Langston University; P.O. Box 1500
> Langston, OK 73050; email: dlmcneely-in-lunet.edu
> telephone: (405) 466-6025; fax: 405) 466-3307
> home page http://www.lunet.edu/mcneely/index.htm
>
> "Where are we going?" "I don't know, are we there yet?"
>
> ----- Original Message -----
> From: anutej-in-loxinfo.co.th
> Date: Thursday, May 11, 2006 1:16 pm
> Subject: Re: NANFA-L-- Re: Chinese Sturgeon on AquaBid
> > Sorry to make it a bit generalized, but in Thailand even with large
> > number of species some exotics do show up in natural waters.
> Recently
> > we get silver arowana, tiger shovelnose catfish and peacock bass in
> > fishermen catch [and these species are from pet trade]. Hope they
> are
> > escapees and not naturally born ones. I agree with the notion of
> > alteration of habitat [that reduce number of native species] as one
> > factor for success in introductions. I've seen Nile tilapias in huge
> > numbers mainly in areas with strong human influences, while in less
> > altered rivers and streams there are much less common. Interestingly
> > ones in less altered habitat tend to grow bigger and healthier.
> >
> > Off topic but does anyone know how do the Clarius [walking catfish]
> > and Asian Swamp eel become established in the US? The same
> > species of
> > Clarius is in trouble in Thailand due to escape/release of hybrid
> > walking catfish used in aquaculture.
> >
> > Tony
> >
> >
> > Peter Unmack wrote:
> > >
> > > On Thu, 11 May 2006 anutej-in-loxinfo.co.th wrote:
> > >
> > > > Even with much worse mortality many aquarium escapees still
> become
> > > > established out of their natural range.
> > >
> > > Obviously it is hard to generalize, but many aquarium escapess
> > become> established in altered aquatic habitats (frequently urban
> > ones) which may
> > > have reduced species diversity and other issues. Sometimes this
> > may make
> > > survival easier, but it can also make it more difficult too.
> > But in less
> > > disturbed systems there are typically fewer established introduced
> > > species. You also have to keep in mind how many fish get
> > released that
> > > never make it? It has been moderately well documented that many
> > initial> introductions fail, and the number of introductions can
> > be an important
> > > factor in determining success. In Australia the first release
> > of rabbits
> > > failed. The second time they took over a large proportion of the
> > > continent!
> > >
> > > Also, many species which do establish are pretty tough. Wimpy
> > species> don't establish very often, or for very long.
> > >
> > > Tootles
> > > Peter Unmack
> > > Provo River, UT
> > > /----------------------------------------------------------------
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