While many top chefs refuse to have a microwave oven in their kitchens, there are a few things that cook as well (if not better) in a microwave oven than any other way. Top of the list has to be firm-textured fish, such as salmon and (especially) trout.
Defrost the trout, either by leaving it in your fridge overnight or (simpler) by using the 'defrost' setting on your microwave oven. (Try a couple of minutes as an initial setting. Then check to see if the outer flesh is very slightly warm. If it is, pierce the fish with a sharp, pointed knife, to check that there are no frozen parts inside).
Once the trout is defrosted, cut several deep slits in the flesh. (If the head and tail haven't already been removed, do so at this stage). Then microwave, on full power, for an appropriate time. (For a single, 'serves one' trout that's around 2� minutes in, say, a 750W microwave oven. If in doubt, cook for a short time and then cut into the fish to check that it's properly cooked).
Serve with some decent (buttered) bread and lemon juice. Delicious! ;-)
Chris