So named because its specially adapted tongue allows it to fire a powerful jet of water up to 12 ft (!) at an insect target above the surface.
Remarkable since its aim must take account of the refraction of light at the air/water interface. Several of these fish peacefully cohabit with a school of barbs as can be seen.
Native to India and Southeast Asia.
I actually had one when I kept tropical fish back in the day.
This image was shot handheld, f/2, 1/40 sec and at the closest focus with a 200mm lens! Amazing what this new photo gear can do..