[Histonet] stain needed to dye external pores
peoshel <@t> wisc.edu
Mon Jun 6 16:49:04 CDT 2005
I used to do this with sculpins from Lake Michigan. Mostly, though we
didn't need to do anything to see the lateral line pores. But! it's
not hard to make a cast of the canal and it's pores. Just take a
blunt syringe needle (aka "90 deg tip") and inject any of several
different things into the canal: Bateson's or Mercox
methylmethacrylate, or the MMA or GMA resins work, but silicone
bathtub chaulk also works. These all give the LL pores and
impressions of the neuromasts within the canal. India ink can be used
for a temporary fill.
One problem with staining the LL canals is that the canals are
usually filled with mucus, typically somewhat thicker than that
covering the fish. One reason the injection methods work is that they
flush out the mucus. But ... fixed in formalin and stored in EtOH ...
this may well cause problems getting stuff into the canal.
>A colleague has some juvenile trout (4-8 inches long) that have been fixed
>in 10% NBF then stored in ethanol. He would like to count the mandibular
>pores located on the underside of the lower jaw. Can anyone suggest a stain
>or procedure which would make these external pores more visible? They would
>prefer to stain the area directly and not process/paraffin embed, etc.. Any
>suggestions will be greatly appreciated.
>Western Fisheries Research Center
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>Seattle, WA 98115
>ph: 206-526-6282 ext 242
>cmconway <@t> usgs.gov
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