Yellow Sea Cucumber (Colochirus Robustus)

Species Name : Colochirus Robustus

Care Level : Expert Only

Temperament : Peaceful

Color : Yellow

Diet : Filter Feeder

Reef Compatible : Yes

Water Conditions : 72-78° F, dKH 8-12, pH 8.1-8.4, sg 1.023-1.025

Waterflow : Medium

Max. Size : 2 inches

Venomous : Poisonous When Stressed or Dies

Origin : Indo-Pacific

Family : Cucumariidae

Supplements : Calcium, Magnesium, Strontium, Iodine, Trace Elements

Colochirus Robustus, commonly known as the Robust Sea Cucumber or the Yellow Sea Cucumber, is a species of sea cucumber in the family Cucumariidae. The Yellow Sea Cucumber which originates from the Indian Ocean is very striking in appearance.

The robust sea cucumber has a soft body and lacks a spine, but it does have an endoskeleton consisting of microscopic spicules, or ossicles, made of calcium carbonate. They are bright yellow in coloration and have an elongated body with spikey projections. When feeding, the Yellow Sea Cucumber extends their branchy feeding arms into the current. These are beautiful filter feeders for an established reef aquarium.

The Yellow Sea Cucumber requires live rock to provide the nutrients it needs to sustain its health. It will usually find a location with moderate to strong current. It is a filter-feeding cucumber and similar in nature to the Sea Apple.

Like other Sea Cucumbers, Colochirus Robustus has the potential to poison an aquarium. The chances of this happening are very rare unless the animal is accidentally sucked into an uncovered pump intake or overflow boxes.

If a small group is kept, spawning in the home aquarium is possible. They may also reproduce by dividing into 2 individuals. This may come about due to stress, or may be a sign of good health.

The Sea Cucumber cannot tolerate high nitrate levels or copper-based medications. 

The diet of a Yellow Sea Cucumber should include liquid or dried phyto and zoo plankton. They will also benefit from the substrate being stirred regularly releasing bacteria and detritus into the water. When malnourished, they will shrink in size, and may lose feeding arms. If these signs are noticed, increase the number of feedings, and target the cucumber with the appropriate food.

Size: Small: 1/2" to 1-1/4" Medium: 1-1/4" to 2"