I'm in the habit of collecting any freshly dead fish I happen to find, but so far my collection is mostly just in jars of rubbing alcohol, which doesn't seem to work very well. The specimens tend to dehydrate, distorting their shape somewhat, and they usually lose their color to some degree. Up until now, all I've had on hand is rubbing alcohol, but I have denatured ethanol and technical-grade formaldehyde available now.
So does anyone have any good guides for what I should do? I'd like to preserve shape and color as much as possible, obviously. I have some specimen-grade jars and some big syringes, too.