Description
The Protoreaster nodosus, commonly known as the Spiny Starfish or Cushion Starfish, is a fascinating starfish in the Indo-Pacific region. It is known for its striking appearance and distinctive, spiny body. This species is often sought after for marine aquariums due to its unique looks and relatively hardy nature.
Appearance:
- Coloration: Protoreaster nodosus is known for its vibrant and varied colour patterns. The body is typically a rich orange, red, or yellow, often with dark spots or bands along its arms. Its coloration can vary significantly depending on its environment, ranging from vibrant orange to subtle shades of yellow and brown.
- Shape: The starfish has a broad, thick, and somewhat flattened body. Its arms are stumpy and wide, typically numbering five, and each is covered with prominent spines or nodules, which give it a rough, spiky texture.
- Size: This starfish can grow to about 12–14 inches (30–35 cm) in diameter, with its arms spreading outwards from the central disc.
Habitat:
- Natural Range: The Protoreaster nodosus is found in the Indo-Pacific region, particularly around Indonesia, the Philippines, and the Great Barrier Reef. It typically resides in shallow waters, often in coral reef ecosystems.
- Preferred Environment: It inhabits sandy, rocky, or reef environments where it can find food sources such as detritus, algae, and decaying organic matter. It is usually found in areas with moderate water flow and plenty of hiding spots.
Aquarium Care:
- Tank Size: A minimum of 75–100 gallons is recommended for this species due to its large size and active feeding habits.
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Diet: Protoreaster nodosus is an omnivore and feeds on a wide variety of foods, including:
- Detritus (decaying organic matter)
- Algae
- Dead coral
- It can also be fed commercial foods such as marine pellets or meaty foods designed for starfish. However, it can be somewhat difficult to sustain if there is a lack of natural food sources in the tank, so supplemental feeding may be necessary.
- Substrate: This starfish prefers a fine sand or gravel substrate where it can crawl and forage for food. It also enjoys hiding in crevices or under rocks.
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Compatibility:
- Protoreaster nodosus is generally peaceful, though its large size means it should not be kept with smaller, more fragile tankmates.
- It does well with other invertebrates like snails, hermit crabs, and peaceful fish.
- It should not be kept with delicate corals, as it may accidentally disturb them while foraging or moving about the tank.
- Reef-Safe: Yes, the Protoreaster nodosus is considered reef-safe. It poses no threat to corals and generally leaves other invertebrates alone. However, it may occasionally disturb tiny organisms when foraging.
Behavior:
- Activity Level: Protoreaster nodosus is a relatively slow-moving starfish. It spends most of its time crawling along the substrate for food. While it is not particularly active in swimming or moving fast, it can be diligent in scouring the bottom of the tank.
- Social Behavior: This species is solitary and not territorial, though it will not hesitate to move into areas with abundant food. It does not require other starfish to thrive but may coexist peacefully with them in larger tanks.
- Feeding Habits: The spiny starfish is a scavenger, feeding on organic debris and leftover food. It uses its tube feet to slowly move across surfaces, extending its arms to find suitable food sources. It is capable of regenerating lost limbs if injured.
The Protoreaster nodosus is a beautiful and unique starfish prized for its bold appearance and beneficial role as a scavenger in the aquarium. This species can be a long-term and visually striking addition to a marine aquarium with proper care, a well-maintained tank, and the right environment.
- Care level: Expert
- Temperament: Peaceful
- Diet: Carnivore
- Reef Compatible: No
- Family: Oreasteridae