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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/ Association (NANFA). Comments made on this list do not necessarily
/ reflect the beliefs or goals of NANFA. For more information about NANFA,
/ visit http://www.nanfa.org Please make sure all posts to nanfa-l are
/ consistent with the guidelines as per
/ http://www.nanfa.org/guidelines.shtml To subscribe, unsubscribe, or get
/ help, visit the NANFA email list home page and archive at
/ http://www.nanfa.org/email.shtml