RE: NANFA-- Off-topic, boring fact for a Tuesday evening

Nicholas J. Zarlinga (njz_at_clevelandmetroparks.com)
Tue, 23 Jul 2002 17:12:34 -0400

Same over here. We have a population of Brook Trout which get a maximum
length in the stream of about 6 or 7 inches. The streams are very small,
far from what I think of as a trout stream. Ironically enough, these are
considered "glacial remnants" because DNA analysis supports that they are
native compared to other locations that have stocked brookies. When you
feed them like any other fish, they still get large. It is hypothesized by
the local wildlife officials that due to the fact that the it is a
headwater stream and is relatively unproductive (relying on allochthonous
[spelled correctly!] material supplying nutrients) that the trout may
actually fall into a nutritional deficite in the winter.

Nick Zarlinga
Aquarium Biologist
Cleveland Metroparks Zoo
216-661-6500 ex 4485

"Fish worship... is it wrong??" (Ray Troll)

On Tuesday, July 23, 2002 4:44 PM, Pete Liptrot
[SMTP:coelacanth_at_btinternet.com] wrote:
> > Allochthonous (notice correct spelling): Describing organisms that are
> > non-native or transient members of a community in a specific habitat.
>
> Just out of interest (or not as the case may be!), a very large
proportion
> of the nutrition available to fish from small depauperate forest streams
is
> derived from allochthonous sources (i.e. arthropods falling out of the
> forest canopy etc. etc.).
> Most of what I've read on the subject refers to rain forest streams,
> courtesy of Michael Goulding et al, but I suppose the same applies to
acidic
> temperate environments.
> We have populations of Trout over here, from highly unproductive streams
> that originate on acid peat moorland, that are fully mature at around 6
> inches because of their reliance on allochthonous nutrition.
> Pete.
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/ For more information about NANFA, visit our web page, http://www.nanfa.org