Fish fly... but why?

We cruising folk have many times gazed in amazement as these little critters break from their watery bonds and fly gracefully through the air; sometimes for hundreds of feet. Most times when making a long run in open ocean, they are about all you see, aside from the occasional sea turtle.

Like this one our buddy Will found on the bow after an all night run up the east coast. This little guy had to have flown at least 8 feet in altitude or he could not have landed on our bow. Usually they cruise at 2 feet max.
But surfing around this morning I came across an interesting video by Discovery Channel. Included inside.