The ghost pipefish is more correctly called an ornate ghost pipefish (harlequin ghost pipefish, is also another name, I think). This distinguishes it from the robust ghost pipefish, which doesn't have the spiky look.
Cheers, Jeff
PS the fish are not only scared by the light reflecting off the air-water interface of each bubble, but also the the sound waves made when we breathe out and as the bubbles rise to the surface. This is used in a fishing technique call moru-ami ... a curtain of bubbles encloses an area and a (huge) net catches everything inside the curtain coz the fish are too scared to run out of the curtain. Interestingly, some plankton-feeding whales also use bubbles to concentrate krill into a tight ball on the water surface, using a spiraling bubble trail, before engulfing the whole lot into its mouth. Where did they learn to do that, I wonder?