Common name: Black sea cucumber

General information

The Cotton-spinner Sea Cucumber, scientifically known as Holothuria forskali, is a fascinating echinoderm that is part of the Holothuriidae family. This species is known for its ability to expel sticky white threads, called Cuvierian tubules, when threatened. These tubules can entangle potential predators, providing the sea cucumber with an effective defense mechanism.

Care

In the home aquarium, Holothuria forskali requires a spacious tank with a sandy substrate to allow for burrowing and surface area for grazing. They are detritivores, feeding on detritus and organic matter, which helps keep the substrate clean. It's important to ensure that the tank is well-established with a stable ecosystem, as these sea cucumbers are sensitive to changes in water quality.

Reproduction

Reproduction in Holothuria forskali typically involves spawning, where males and females release sperm and eggs into the water column. In the aquarium, breeding is rare, but stable conditions and a mature system may encourage spawning behavior.

Symbiosis

While not known for any specific symbiotic relationships like those seen in clownfish and anemones, Holothuria forskali contributes to the overall health of the reef ecosystem by processing organic waste and detritus.

Habitat

The Cotton-spinner Sea Cucumber is found in the Mediterranean Sea and the eastern Atlantic Ocean, from the British Isles to the coast of Morocco, including the Canary Islands. It typically resides on rocky or sandy substrates, often hiding during the day and emerging at night to feed.