Re: NANFA-L-- euthanasia - Clove Oil

Bruce Stallsmith (
Wed, 30 Aug 2006 15:05:22 -0400

Death by MS-222 DOES release colors in a fish in my experience and others
too. For a color phenotype study we euthanize fish in MS-222 and photograph
them immediately as the chromatophores relax and show the maximum color. It
doesn't last all that long, though.

--Bruce Stallsmith
along the Tennessee
Huntsville, AL, US of A

>From: Peter Unmack <peter.lists-in->
>To: nanfa-l <>
>Subject: Re: NANFA-L-- euthanasia - Clove Oil
>Date: Wed, 30 Aug 2006 10:11:08 -0500 (CDT)
>On Wed, 30 Aug 2006, Todd D. Crail wrote:
> > "Much to the bane of some ichthyologists because they don't get the firm
> > color reaction or extended fins because the fish aren't struggling."
>I totally don't buy that argument, although I've heard it many times. My
>specimens come out looking just great most of the time in terms of their
>fins. Color fades anyway and I'm not really sure that dieing in formalin
>really increases color any. I'd like to see someone do some comparisons
>between formalin death and clove oil death to see if it really matters. I
>very much doubt it. Of course, if you store you jars of formalin in the
>sun / don't fill the jars up then your specimens are screwed anyway. I'm
>always amazed by how few ichthyologists actually carry their specimens in
>coolers. Once they get heated up for too long then you have just wasted
>your time as in the long term as they don't make good specimens.
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