Re: NANFA-- Sacrificing or immobilizing fish

Roselawn Museum (
Mon, 29 Jul 2002 13:15:35 -0400

Replying as a novice...

I don't know about cost, but in cases where you have to study the way the
intestines are arranged or counting pharyngeal teeth, cutting the specimen
open is the only way I can imagine. Otherwise, it might work where you only
have to make a close examination of the exterior.

Steven A. Ellis
Kennesaw, GA

At 11:03 AM 7/29/02 -0500, you wrote:
>I'm way out of my league in asking about this, but Martin's observation in
>his darterfest account that
>*after speaking with these darter folks I see the necessity of
>killing/preserving fish to identify what they are. it's to hard to count
>rays and scales on moving fish!*
>is something I'm sure that resonates with a number of amateurs.
>While looking for something else in the introduction to the Medakafish
>I noticed that in a section on Anesthesia there were several anesthetics
>which could be used for sexing, observing or operating (!) on medaka.
>Tokio Yamamoto suggested that
>*For this fish, however, phenylurethane is the best. Phenylurethane of 0.015
>percent may be used satisfactorily to immobilize the fish...*
>and advised against immobilizing any fish more than once a day.
>It may be that those anesthetics are prohibitively expensive, or
>unrealistic/unwise, to work with, for any of several other reasons.
>Is it feasible to do fish IDs with an anesthetic or is this just fuzzy
>minded fish hugging?
>Thanks and all the best!
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