My friend in Hawaii, Syd Kraul, who's something of a magician and definitely a pioneer when it comes to raising baby fish, pointed me to his photographs of baby flying fish. In regards to the photo above, he wrote:
Flying fish about a week old and already growing wings, but not flying yet.
About this photo, Syd wrote:
One of my favorite baby fish. They could fly at 2 weeks old, but they flew into the tank sides and stuck there.