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Marine Animal Encyclopedia

Olive Sea Snake Aipysurus laevis

The Olive Sea Snake is a highly venomous snake that actively hunts small to medium sized fishes and benthic invertebrates, including prawns and crabs. It prefers to hunt only at night and only comes out of its daytime hiding places to take occasional breaths. Olive Sea Snakes are naturally curious and are known to approach SCUBA divers, not aggressively but inquisitively, especially at night. Though they only rarely bite people, their bites have been known to be fatal. Olive Sea Snakes do not leave the water to nest or for any reason at all. This species reproduces via internal fertilization and gives live birth to a few (6-8) well-developed young that do not receive any parental care. The young are significantly darker than adults and develop the olive/brown color as they mature. Large bony fishes, sharks, and predatory birds are known to eat juvenile and even adult Olive Sea Snakes.

Olive Sea Snakes are not fished by people, but they are at risk of accidental capture by fishers targeting other species – particularly bottom trawlers. This species prefers to venture off of the reef, at night, to hunt for bottom dwelling prey that is also targeted by fishers. This behavior increases their likelihood of being accidentally captured. Though scientists generally believe some populations of Olive Sea Snakes to be decreasing, it is considered a species of least concern across its entire distribution.

Additional Resources

Olive Sea Snakezoom image
  • Distribution tropical western Pacific Ocean from northern Australia to New Guinea and surrounding island groups
  • Ecosystem/Habitat coral reefs
  • Feeding Habits active predator
  • Conservation Status least concern
  • Taxonomy Order Squamata (snakes and lizards), Family Elapidae (sea snakes and relatives)
Olive Sea Snake habitat mapzoom image