Yes, flying fish are a real and I would love to sea these fish be added in game.
Health: 3 health points
Behavior: They swim underwater but they will sometimes start to jump above and will begin to slowly glide down to the water. They can normally be seen gliding in groups.
Raw Flying Fish: 2 Food Points
Cooked Flying Fish: 4 Food Points
Is There More?: Maybe they can be used to make a special potion(and it can not be a flight potion sadly cause it would be too OP).