Re: NANFA-- Schreckstoff (was Creek Chub Removal_

Christopher Scharpf (
Wed, 10 Sep 2003 19:51:30 -0400

To address a few lingering questions...

Schreckstoff is known primarily from ostariophysans, but may not be unique
to that superorder. According to Moyle & Cech's ichthyology textbook, it may
be found in other fishes (but it doesn't say which ones).

For Schreckstoff to be released, the skin must be broken. So it appears
doubtful that a fish can release it just when it's simply stressed or

Schreckstoff can be detected by closely related species.

Perusing the literature I get the impression that Schreckstoff is a poorly
known, poorly studied phenomenon. The degree of Schreckstoff-iness varies
between species, and is more prevalent in turbid waters where vision is

Chris Scharpf
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