Are these the hormones that angling bait additives/ fish attractant mimic?
----- Original Message -----
From: "Christopher Scharpf" <ichthos_at_comcast.net>
To: <nanfa_at_aquaria.net>
Sent: Tuesday, September 09, 2003 10:42 PM
Subject: NANFA-- Schreckstoff (was Creek Chub Removal_
> > Is it fairly common for a wounded cyprinid to release something alerting
the
> > rest of the school?
> >
> > If so, is that only true of North American cyprinids as opposed to
European,
> > S.E. Asian or African cyprinids or do cyprinids world wide do that??
>
>
> Minnows belong to a large and disparate superorder of fishes called
> Ostariophysi, which also includes suckers, loaches, catfishes, characins,
> knifefishes, and the electric eel, among others. One ostariophysan trait
is
> the ability to produce a chemical substance called Schreckstoff (from the
> German words for fright and stuff). When an ostariophysan fish is bitten
by
> a predator, special skin cells release Schreckstoff into the water. This
> sends a message to schoolmates and other closely related species to take a
> variety of escape actions.
>
> Some ostariophysan fishes have lost their ability to produce Schreckstoff
> for adaptive reasons. For example, piranhas do not release an alarm
> substance since many of their prey are ostariophysans, and it wouldn't
make
> sense for them to flee each time they bit into a fish.
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