let me start with this, im a catch and release guy period, i dont eat fish not even store bought salmon, i dont like the flavor(something is probably wrong with me i know haha)

anyways, a friend of mine keeps some fish from the local lake(dumb stockers) and he used a big companies letter opener to gut the fish.
it looked like this:

he would slip it in near the gill plate and slide it down the belly right down to the anal fin, and gut the trout and do anything else, then put it on ice in all of about 2 minutes.

so if you didnt already know theres something you may want to check out.