On the subject of trout, I came across a recipe for garter snake food on the net, on an apparently otherwise sensible website. The guy claimed it worked perfectly for him,.
The basic idea was to blend the (fresh, raw, gutted, whole) trout in the blender, and then mix it with enough plain clear gelatine to set it, and then score the stuff and freeze it.
When it's time to feed, break off a piece on a score-line, thaw and serve.
Well, I tried it, with a whole trout (minus two filets for me and the roommate) and used 2 packets of gelatine according to the directions.
Snaky wasn't enthused. She won't even look at the horrid stuff, and frankly I don't blame her.

So, if it works for you, that's great -- a decent form of food for the winter, and thiaminase-free. But just incase you haven't tried the recipe if you've been wondering about it, that's my experience with it.

LOL, now I have a frozen tray of fish jello.. Ugh.. Well, 'something' that lives outdoors will surely like it