Subject: Although Moray Eels are quite ferocious predators themselves, they do have powerful enemies. Sharks and Barracudas are known to prey on these eel-like fish. At first glance this Undulated Moray Eel (Gymnothorax undulatus) seemed to have a shell or a parasite attached to its neck. Once I examined the footage on a big screen I noticed the scar. So maybe (this is just an assumption) the thing looking like a parasite or mollusc is a fleshy lump that resulted from a predator’s attack.
Technique: I always like to start my video clips with the details to reveal the entire subject in a later phase. It’s a technique I often use to better engage the viewer by generating his/her curiosity.