Trout happily eat insects, but also minnows, worms, snails, shrimp, crabs etc. The culinary best trout are orange-fleshed ones that feed on crustacea. Lure fishing is used to do this. This is an aggressive form of fishing whereby you may interfere with the territorial instincts of a fish and provoke it to strike. Feathered lures can be used with a fly rod and sinking line or with a spinning rod using a lead ball weigh, casting across and down river or in a lake.
Lure fishing has nothing to do with imitating insects.
At times the lure might imitate a minnow. The Lake Taupo fishery is unique in that the winter spawning runs of rainbow trout are fished in the lower reaches of the rivers that flow into the lake. The travelling angler has to be content with only one rod. Fortunately, special backpacker rods are made that do all this and pack away to almost nothing. These fishing spots are accessible by walking, bus, colectivo or taxi from the nearest town and provide inexpensive fishing for trout and salmon.