Morays have an excellent sense of smell, and have the nares what we call as nostrils, developed into tubes. Most fishes have two nostrils on each side of the head. Water passes in the anterior nostril and out through the posterior nostril. Under the skin, between the 2 nostrils, lies the nasal apparatus, which gives the fish its sense of smell.
For most fish species it is common for the 2 nostrils to be close together. In the Green Moray however, the nostrils are widely separated. The anterior nostrils, located on the snout are extended into tubes, whereas the posterior nostrils have shorter tubes and are situated above the eyes.