Re: NANFA-- Spawning in high water/non-point

Bruce Stallsmith (
Sun, 27 May 2001 18:09:44 -0400

> What prey species population has the brown trout reduced to the degree
>concern? The brown trout is hardly "environmentally tolerant". All the
I'll leave it at saying brown trout would not have to reduce any population
to "concern" levels to have a negative impact; I refer to changing local
abundance of usually obscure animals such as aquatic insect forms, which can
have indirect effects on other species down to the phytoplankton level. Some
research has been done on these types of effects. One EPA group studied the
presence/absence of various minnow species in northern New England lakes, in
which some of these lakes have had bass introduced, some have had pike
introduced, some have had both introduced and some were spared such
introductions. The lakes without such introductions had more minnow species.
That's not brown trout in Michigan, but I'd bet half a peach that you could
find similar effects with aquatic arthropods. Not a glamorous group to most
people, but...

--Bruce of the Stallsmiths
Huntsville, AL

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