I was left wondering after watching a nature programme, about flying fish. My question to you is - If flying fish flapped their wings like a bird would they actually be able to fly high ?
Flying fish are actually "gliders". Their short flights are powered by rapid movements of the caudal (tail) fin while still in the water. The "wings" are simply highly modified pectoral fins, that are extended as they leave the water. The shape of the "wings" provides lift, but these animals do not have either the musculature nor the internal structural strength of the "wings" to allow for powered flight by means of flapping these appendages.
They are incapable of flapping the wings, if that answers your question.