Urchin Clingfish | Diademichthys lineatus

The Urchin Clingfish (Diademichthys lineatus), also known as the Long-Snouted Clingfish, is a fascinating Indo-Pacific reef fish recognized for its slender, elongated body, distinctive longitudinal stripes, and unusual snout. This species is commonly associated with long-spined sea urchins, particularly those of the genus Diadema, using their protective spines as shelter from potential predators. Unlike most reef fish, Urchin Clingfish possess a specialized adhesive disc on their underside that allows them to cling securely to rocks, urchins, and other surfaces.

Care Level: Moderate
Maximum Size: ~2 inches
Minimum Tank Size: 5 gallons
Temperament: Peaceful / Shy
Reef Safe: With Caution
Diet: Carnivore / Specialized Feeder
Temperature: 74–80°F
Specific Gravity: 1.023–1.026
pH: 8.0–8.4

Urchin Clingfish are best maintained in mature, established reef aquariums with plenty of live rock, sheltered areas, and ideally a compatible long-spined sea urchin for natural shelter. In the wild, this species feeds on tiny crustaceans. Offer a varied diet of small meaty foods such as enriched baby brine shrimp, copepods, finely chopped mysis, and other appropriately sized frozen or live foods. Some individuals may be reluctant to accept prepared foods and require additional attention during acclimation.