Fauna
Invertebrate

Giant California Sea Cucumber

Apostichopus californicus

Also known as California Sea Cucumber, Red Sea Cucumber

Giant California sea cucumbers scour the Pacific seafloor using specialized peltate feeding tentacles, vacuuming up fine sediment and detritus to recycle nutrients back into benthic food webs. When threatened by hunting predatory sea stars, they flex their muscular bodies into a distinct C-shape and thrash violently into the water column to swim away. In autumn, adults enter an unusual physiological dormancy, reabsorbing their internal viscera and digestive tract entirely before regenerating new organs in the spring.

MarineBenthicInvertebrate
Giant California Sea Cucumber reference1 / 6
(c) Ken-ichi Ueda, some rights reserved (CC BY) · cc-by
—observations
—countries
—peak records
Data DeficientConservation statusIUCN Red List categoriesLCNTVUENCREWEXData Deficient — not placed on the risk ladderRed List categories, explained →
Key facts
Diet & preyDetritus, Marine Sediment, Benthic Microalgae
Predators
  • Sunflower Sea Star
  • Sea Otter
  • Giant Pacific Octopus
ThreatsTargeted commercial dive fisheries, bottom trawling damage, and ocean acidification
HabitatsSubtidal rocky reefs, kelp forests, boulder fields, and bedrock slopes
Life span8–12 years
Classification
  1. OrderSynallactida
  2. FamilyStichopodidae
  3. GenusApostichopus
  4. SpeciesApostichopus californicus
Range & activity
Range data is not available yet.
Safe observation
Interaction riskLow
  1. Low
  2. Moderate
  3. High
  4. Very high
Why interaction risk is low
Safe to observe at a normal distance.
Responsible observation
  • Tidepool Etiquette: Look for them submerged in deep outer tide pools during low spring tides, but avoid touching their sensitive papillae.
  • Diving Etiquette: Maintain neutral buoyancy over reef boulders to view their feeding tentacle fans without disturbing bottom sediments.
Related species
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