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I worked extensively with raising paddlefish in 1995.
When I terminated my live fingerlings I used the following preservative:
Equal parts 37% formaldehyde, Isopropyl (rubbing alcohol), distilled white
vinegar (the kind you use in cooking) and distilled water.
This solution preserves the coloration very nicely (at least in
paddlefish). And none of my specimens have shown any deterioration or
discoloration. As for quality for DNA anaylsis I really could not say. I
can say the fishes asthetic and structural integrity has been well
Hope this helps, most of these ingredients are easily available.
Just be sure not to get any of the formaldehyde on your skin, perhaps use
protective gloves or forceps.
mantis at midrivers_com