Chocolate Chip Sea Star Care Guide
Protoreaster nodosus is an Indo-Pacific sea star named for the dark conical knobs on its arms. It is not reef safe and suits fish-only-with-live-rock systems.
Overview
Protoreaster nodosus, the chocolate chip sea star, is a five-armed asteroid of the family Oreasteridae from the warm, shallow waters of the Indo-Pacific. It is named for the single row of dark conical projections along the upper surface of each arm, which against a tan body recall the chips of a cookie. Body colour ranges from tan and brown to reddish, and the ventral tube feet are pale pink to purple. The species is common in the marine aquarium trade, where it is best kept in fish-only-with-live-rock systems rather than reefs.
Taxonomy
- Class: Asteroidea
- Order: Valvatida
- Family: Oreasteridae
- Genus: Protoreaster
- Scientific name: Protoreaster nodosus (Linnaeus, 1758)
Habitat
The species occurs across the tropical Indo-west-central Pacific, with records spanning roughly Thailand to Samoa and Japan to New Caledonia, including the East Indies, northern Australia, the Philippines and southern Japan. It favours sheltered sandy or slightly muddy bottoms at depths of about 0–30 m and is frequently seen resting conspicuously among the leaves of seagrass beds. It tolerates intertidal exposure but does not handle rapid environmental changes well.
Tank requirements
- Minimum tank volume: 300 L
- Temperature: 24–26 °C (75–79 °F)
- pH: 8.1–8.4
- Carbonate hardness (dKH): 8–11
- Specific gravity: 1.024–1.026
- Adult diameter: up to about 25–30 cm
- Lifespan: roughly 5–17 years
A deep sandy or fine substrate and stable, fully mature water chemistry are important, and the animal should be acclimated slowly because it reacts poorly to sudden parameter swings.
Diet
In the wild Protoreaster nodosus behaves as an opportunistic carnivore and detritivore, feeding on most sessile life including sponges and hard corals, grazing biofilms and small benthic organisms, and even taking snails and sea urchins. In captivity it should be target-fed meaty pieces such as shrimp, clam or squid every one to three days according to its size.
Compatibility
This sea star is not reef safe: it consumes corals, sponges, tube worms, clams and other sessile invertebrates, so it belongs in fish-only-with-live-rock setups alongside peaceful, non-predatory fish. It should be kept away from soft and stony corals, clams and harlequin shrimp, which prey on sea stars.
Conservation status
Wild populations across tropical Asia and the Pacific are under pressure from overharvesting for the curio and aquarium trades, a concern repeatedly noted in species accounts.