Salt can work, but can cause trouble with analyses as pointed out by Simon.
I would also avoid ethanol because it can also lead to variable changes in
delta values - we summarized this in Versteegh et al. (2011).

We have had good results with simply sun drying in a place where there is a
good breeze (such as a window sill).


Versteegh, E.A.A., D. P. Gillikin and F. Dehairs (2011). Analysis of δ15N
values in mollusk shell organic matrix by EA-IRMS without acidification: an
evaluation and effects of long-term preservation. Rapid Communications in
Mass Spectrometry 25: 675-680. doi: 10.1002/rcm.4905
David P. Gillikin, Ph.D.
Associate Professor of Geology
Director: Union Stable Isotope Laboratory
Union College
Department of Geology
807 Union St.
Schenectady, NY 12308

Office phone: (518) 388-6679
Lab phone:     (518) 388-8741
email:  [log in to unmask]
Lab Website:

From:  Stable Isotope Geochemistry <[log in to unmask]> on behalf of
Chris Harrod <[log in to unmask]>
Reply-To:  Stable Isotope Geochemistry <[log in to unmask]>
Date:  Friday, April 14, 2017 at 6:26 PM
To:  <[log in to unmask]>
Subject:  Re: [ISOGEOCHEM] Field preserving fish for 15N and 13C

Salt can work, silica gel or if you've got power, you could use a dessicator
(thing used to dry fruit - ca. 30 euros/USD from Amazon). Many people use

-------- Original message --------
From: "Michalski, Greg M" <[log in to unmask]>
Date: 14/04/2017 15:33 (GMT-04:00)
To: [log in to unmask]
Subject: [ISOGEOCHEM] Field preserving fish for 15N and 13C

Is there a standard technique for preserving fish in the field for future
15N and 13C analysis?  I plan to core muscle, and was thinking of just bring
exitainers with desiccant, dry them in situ.  I wont have
refrigeration/freezer options so looking to preserve during collection and
transport without fractionation