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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). 

Cheers,
Dave

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]
web: http://minerva.union.edu/gillikid/
Lab Website: http://minerva.union.edu/gillikid/lab.htm
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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 ethanol. 


-------- 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