Vivian's Fish

I was looking through some older photographs, some that I had set aside for one reason or another.  When I saw this, I couldn't remember why I didn't post it after I shot it.  This is so cute!  Vivian actually found this dead fish lying on the sandbar after the tide went out, and she was fascinated by it.  I have never seen a fish this long and this thin, and I wonder what kind of fish it is.