Not exactly "taxidermy", but I just leave most of my plecos outside to dry to "preserve" them- the desiccated corpses only have a faint odour, and other than being brittle, tend to keep/store well.
One of the more interesting fishes to desiccate- the body proportions do not get distorted, due to the bony plates, and the odontodes on the males are quite noticeable and impressive.
I have a bunch of plecos, along with other miscellaneous fishes, frozen in my freezer, too, so that one day I might be able to acquire enough formalin to thaw and preserve them all.