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<div class="moz-cite-prefix">Hi Rob (and all),</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">that was my thought, too. Because they
are frozen in boxes for considerable time now and have been
obviously thoroughly sun-dried before shipping (they are like
wooden boards), the fins in a close to freeze-dried condition. By
bagging them frozen in small batches (only if the fins are free of
ice crystals) my intention was to shift the point of condensation
to the outside of the PE-bag away from the tissue. Adding
desiccant packets into the bags as recommended by Andy and Thomas
surely is a good idea, I also planned put desiccant into the boxes
to keep the bags in a as stable as possible microclimate inside
the boxes. <br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">On the points that Paul raised
(shrinkage, embrittlement and bacteria growth) the first two are
absolutely valid - the fins show significant signs of shrinkage,
but we largely have dorsal, pectoral and pelvic fins - which are
very sturdy in most sharks - crumbling membranes (or fin rays, of
course) are not too much of a problem. The third, bacterial growth
is an interesting one: while we recently had some mould issues on
prepared bony fish skeletons due our malfunctioning climate
control systems, there were absolutely no signs of mould or
bacterial growth on our dry shark jaws or sawfish saws (both are
kept dry and open in our storage area).</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Many thanks for all your thoughtful
replies, much appreciated!</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">With best wishes</div>
<div class="moz-cite-prefix">Dirk<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Am 22.09.2020 um 18:45 schrieb Robert
Waller:<br>
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<p class="MsoNormal"><span lang="EN-CA">Hi Dirk,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">Just for clarification,
when we have an impermeable barrier between cold and warm,
condensation will occur on the warm side of the barrier. In
this case, condensation due to a thermal gradient would
occur on the outside of the bag. If there is no ice on the
specimens then we would expect the RH within the bag to
remain moderate to low. Always good to check that by
monitoring at least for the first bag you deal with.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">Rob<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b>From:</b> Nhcoll-l
<a class="moz-txt-link-rfc2396E" href="mailto:nhcoll-l-bounces@mailman.yale.edu"><nhcoll-l-bounces@mailman.yale.edu></a> <b>
On Behalf Of </b>Dirk Neumann<br>
<b>Sent:</b> Tuesday, September 22, 2020 6:58 AM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:nhcoll-l@mailman.yale.edu">nhcoll-l@mailman.yale.edu</a><br>
<b>Subject:</b> [Nhcoll-l] bagging and thawing or thawing
and bagging?<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p>Hi all,<o:p></o:p></p>
<p>a brief question regarding bagging of dry shark fins that
were confiscated by customs (approx. 50 kg) and deposited in
our collection. When the material arrived, boxes were full of
life with thick layers of beetle remains at their bottom. We
kept the fins mostly frozen so far (several freezing / thawing
cycles to kill the critters) but now have to move the fins
into our storage area where they will be kept at room
temperature.<o:p></o:p></p>
<p>Because of major renovation works, our climate control
systems are currently shut down thus temperature and rH are
fluctuating and not really stable, thus I was wondering if I
should seal small subsets (5-10 fins, depending on their size
and volume) while they are still frozen to avoid that tissues
would attract too much humidity during thawing. Of course this
would cause condensation inside bags after sealing to some
extent, but given the small total volume of air inside the
bags, potential negative effects might be negligible ? Bagged
fins will finally be stored in transparent plastic boxes to
allow easy monitoring.<o:p></o:p></p>
<p>Any ideas/ suggestions would be welcome; thanks in advance<o:p></o:p></p>
<p>Dirk<o:p></o:p></p>
<div>
<p class="MsoNormal">-- <o:p></o:p></p>
<p><img style="width:1.5833in;height:.6157in"
id="Picture_x0020_1"
src="cid:part1.6BB21F6B.DF1E7B53@snsb.de" class=""
width="152" height="59"><o:p></o:p></p>
<p style="margin-bottom:12.0pt"><br>
Dirk Neumann<br>
<br>
Tel: 089 / 8107-111<br>
Fax: 089 / 8107-300<br>
neumann(a)snsb.de<br>
<br>
Postanschrift:<br>
<br>
Staatliche Naturwissenschaftliche Sammlungen Bayerns<br>
Zoologische Staatssammlung München<br>
Dirk Neumann, Sektion Ichthyologie / DNA-Storage<br>
Münchhausenstr. 21<br>
81247 München<br>
<br>
Besuchen Sie unsere Sammlung:<br>
<a href="http://www.zsm.mwn.de/sektion/ichthyologie-home/"
moz-do-not-send="true">http://www.zsm.mwn.de/sektion/ichthyologie-home/</a><br>
<br>
---------<br>
<br>
Dirk Neumann<br>
<br>
Tel: +49-89-8107-111<br>
Fax: +49-89-8107-300<br>
neumann(a)snsb.de<br>
<br>
postal address:<br>
<br>
Bavarian Natural History Collections<br>
The Bavarian State Collection of Zoology<br>
Dirk Neumann, Section Ichthyology / DNA-Storage<br>
Muenchhausenstr. 21<br>
81247 Munich (Germany)<br>
<br>
Visit our section at:<br>
<a href="http://www.zsm.mwn.de/sektion/ichthyologie-home/"
moz-do-not-send="true">http://www.zsm.mwn.de/sektion/ichthyologie-home/</a><o:p></o:p></p>
</div>
</div>
</blockquote>
<p><br>
</p>
<div class="moz-signature">-- <br>
<p><img src="cid:part4.A7888B44.5EA52342@snsb.de" alt=""
width="152" height="59"></p>
<p><br>
Dirk Neumann<br>
<br>
Tel: 089 / 8107-111<br>
Fax: 089 / 8107-300<br>
neumann(a)snsb.de<br>
<br>
Postanschrift:<br>
<br>
Staatliche Naturwissenschaftliche Sammlungen Bayerns<br>
Zoologische Staatssammlung München<br>
Dirk Neumann, Sektion Ichthyologie / DNA-Storage<br>
Münchhausenstr. 21<br>
81247 München<br>
<br>
Besuchen Sie unsere Sammlung:<br>
<a class="moz-txt-link-freetext" href="http://www.zsm.mwn.de/sektion/ichthyologie-home/">http://www.zsm.mwn.de/sektion/ichthyologie-home/</a><br>
<br>
---------<br>
<br>
Dirk Neumann<br>
<br>
Tel: +49-89-8107-111<br>
Fax: +49-89-8107-300<br>
neumann(a)snsb.de<br>
<br>
postal address:<br>
<br>
Bavarian Natural History Collections<br>
The Bavarian State Collection of Zoology<br>
Dirk Neumann, Section Ichthyology / DNA-Storage<br>
Muenchhausenstr. 21<br>
81247 Munich (Germany)<br>
<br>
Visit our section at:<br>
<a class="moz-txt-link-freetext" href="http://www.zsm.mwn.de/sektion/ichthyologie-home/">http://www.zsm.mwn.de/sektion/ichthyologie-home/</a><br>
<br>
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