Anglerfish  (Lophius piscatorius)

Dorsal fin: the unpaired fin found on the back of the body of fish, or the raised structure on the back of most cetaceans.
Larvae : the stage in an animal’s lifecycle after it hatches from the egg. Larvae are typically very different in appearance to adults; they are able to feed and move around but usually are unable to reproduce.
Pectoral fins: in fish, the pair of fins that are found one on each side of the body just behind the gills. They are generally used for balancing and braking.