Northern Mangrove Sea Snake
Parahydrophis mertoni
A small sea snake found along northern Australia's extensive mangrove coastlines, adapted to tidal creek and estuarine habitats.
- Venomous?
- Venomous
- Adult length
- 0.4-0.6 m (1.3-2 ft)
- Range
- Mangrove estuaries of northern Australia and southern New Guinea
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Overview
The northern mangrove sea snake occupies the extensive mangrove and tidal creek systems along Australia's northern coast and southern New Guinea, one of the most intact mangrove ecosystems in the world. This habitat provides abundant small fish prey and shelter from larger predators.
It is the only species in the genus Parahydrophis and is considered a relatively primitive sea snake, retaining some traits linking it to shore-dwelling ancestors.
How to identify it
- Grayish to olive body with darker banding or mottling
- Small head not distinct from the neck
- Retains somewhat enlarged ventral scales, unusual among fully aquatic sea snakes
- Compressed, paddle-shaped tail suited for maneuvering in tidal creeks
- Mangrove habitat association and small size aid identification alongside pattern features
Habitat & range
Inhabits mangrove forests, tidal creeks, and estuarine waters along the northern Australian coastline and southern New Guinea, moving with tidal cycles between open water and root-dense habitats.
Behavior, diet & reproduction
Feeds on small fish among mangrove roots and tidal channels, likely ambushing prey in structurally complex habitat. Live-bearing, giving birth to young in coastal waters, with activity patterns influenced by tidal flow.
Frequently asked questions
Is the northern mangrove sea snake dangerous?
It is venomous, but bites to humans are rare given its shy, avoidant nature and small size.
Where does it live?
Along northern Australia's mangrove coastlines and southern New Guinea's tidal creek systems.
What habitat does it prefer?
Mangrove forests and estuarine tidal creeks with abundant small fish prey.
What does it eat?
Small fish hunted within mangrove root systems and tidal channels.
Northern Mangrove Sea Snake guides
In-depth guides for identifying and understanding Northern Mangrove Sea Snake.
