NANFA-- introduced species

Flash of brilliance (
Mon, 17 Apr 2000 04:20:23 PDT

Hi everyone,

I'm a biology student and i have to write a topic about introduced fish
species (in Western Europe) and the effects of these introductions on the
native fish fauna. So far, i have found some information about the grass
carp, which originally comes from East-europe, and which was introduced in
an attempt for weed-control.
I would like information about some American species like : Lepomis
gibbosus, Umbra pygmaea, Ictalurus nebulosis, etc...
It seems like there are plenty more species in America than in Belgium, so
there is a much stronger competition for niches in America. After
introduction in Belgium, the introduced species apparantly come into an
environment with less competition, but they seem to avoid competition in our
country by taking in any niche which is open. Does this idea follow any
logic or do you think otherwise ?
Please give me more info.
Thanx !!!!!!!
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