Common name: beaded sea cucumber

General information

The Black Longspine Sea Cucumber, scientifically known as Euapta lappa, is a unique and fascinating invertebrate that can be a striking addition to a marine aquarium. This species is known for its elongated body and numerous long, thin, black spines that cover its surface, giving it a distinct appearance. In the wild, they are often found in tropical reef environments, where they play a crucial role in the ecosystem by consuming detritus and helping to recycle nutrients.

Care

Euapta lappa requires a well-established aquarium with a deep sand bed and plenty of live rock to thrive. They are sensitive to changes in water quality, so stable conditions and regular maintenance are essential. This species is nocturnal and will often bury itself in the substrate during the day, emerging at night to feed. A varied diet of detritus, leftover food, and specially formulated sea cucumber diets will keep them healthy.

Reproduction

Reproduction in Euapta lappa is typically sexual, with individuals releasing gametes into the water column where fertilization occurs. In the aquarium, breeding is rare, but hobbyists may occasionally observe spawning behavior. The larvae are planktonic and go through several developmental stages before settling to the bottom and transforming into their adult form.

Symbiosis

While Euapta lappa does not have any well-known symbiotic relationships like clownfish with anemones, they are an integral part of the clean-up crew in a reef aquarium. Their scavenging habits help to keep the substrate clean and aerated, which benefits other tank inhabitants by maintaining water quality.

Habitat

Black Longspine Sea Cucumbers are typically found in warm, tropical waters, often associated with coral reefs. They prefer areas with sandy bottoms where they can easily burrow and hide. In the aquarium, providing a similar environment with ample hiding places and a sandy substrate is crucial for their well-being.