My Yellow tang is as fat as he can be. Bulky muscle and he has these line on his body, seem like equivalent of six-pack on human abdomen. Anybody have tangs with similar finding. Here is a picture of what I am taking about. I font think these are actual ridges on his body, but just coloration when the light is at certain angle.
The indented lateral lines is actually real. His body at the dorsal and abdomen are thicker than the body at the lateral line. Often in emaciated fishes lateral line stick out because of atrophy of the muscle in the dorsal area. In this yellow tang, it is the opposite.