Re: NANFA-- anchor worms?

D. Martin Moore (
Fri, 27 Aug 1999 01:42:25 -0500

"40% formalin" according to one reference, "formaldehyde"
according to Innes. Hey, I just report the news, I don't make it! I'm
not familiar with the nomenclature of formaldehyde, except that I
thought formaldehyde dissolved in water was called formalin.
Anyway, the 37% solution is what most of the civilized world uses,
and what I believe most authors refer to. I'll ask Stott; he has a
degree in chemistry.

Many OTC medications have formalin/aldehyde in them, but at a
dosage more suited to prolonged exposure.

> Ok now I am really confused..... Formaldehyde is a 37% solution of active
> formaldehyde in water..... so the actual formaldehyde is already
> diluted...this is standard. Formalin is formaldehyde diluted 1 to ten
> with water, so in formalin, the active formaldehyde is only 3.7 %. When
> you are saying 40% formalin are you really referring to stock
> formaldehyde??? Thats what it sounds like!!!!
> D. Martin Moore wrote:
> > Oops, actually that was inaccurate. The recommendation is 2.5 ml
> > of 40% formalin, in 10 liters of water, for 30 minutes. Innes
> > recommended 20 drops per gallon (which is about the same
> > concentration) for 5-10 minutes, or until the fish shows



Greater American Freshwater Fishes Resource Site (GAFFeRs):

"Fie on thee, fellow! Whence come these fishes?" - Scheherazade

"Any fish with good teeth is liable to use them." - Wm. T. Innes

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