Common name: Plump sea cucumber

General information

The Fat Sea Cucumber, Actinopyga obesa, is a distinctive echinoderm known for its plump, elongated body and the presence of numerous papillae, which are small, finger-like projections covering its surface. This species is not as commonly kept as some other sea cucumbers, but it can be a fascinating addition to larger reef or fish-only systems due to its unique appearance and behavior.

Care

Actinopyga obesa requires a spacious aquarium with a deep sand bed and plenty of live rock to thrive. It is a detritivore, feeding on detritus and organic matter within the substrate. Stable water quality and the absence of aggressive tank mates are crucial for the well-being of this species. It's important to note that sea cucumbers can release toxins when stressed, so careful handling and acclimation are essential.

Reproduction

Reproduction in Actinopyga obesa typically involves spawning, where both males and females release gametes into the water column. In the aquarium, spawning is rare, but if conditions are ideal, it can occur. The larvae are planktonic before settling to the bottom and developing into juveniles.

Symbiosis

While not known for specific symbiotic relationships like clownfish with anemones, sea cucumbers play a vital role in the ecosystem by processing detritus and aerating the substrate, which benefits other tank inhabitants indirectly.

Habitat

The Fat Sea Cucumber is found in the Indo-Pacific region, from the Red Sea and East Africa to the central Pacific. It prefers reef environments and lagoons, typically residing in sandy areas where it can burrow and scavenge for food.