My new favorite fish

This is an actual fish, actually one of many, that was swimming around me while snorkeling today. It is black as velvet with these two white neon lines where the upper and lower fins connect to its body.  It propels itself with those upper and lower fins.  It doesn't have side fins.

I have done nothing to enhance the picture other than crop to this size. 

There were many of these guys along with other kinds that stayed around me. 

Today, I joined a family that were taking a diving lesson. I snorkeled while they dived with the instructor.  We boated to a reef just south of the international pier.