Bluestripe Pipefish

The bluestripe pipefish (Doryrhamphus excisus) is a small member of the family Syngnathidae widely distributed across the Indo-Pacific and into the eastern Pacific. It is one of several pipefish species known to perform cleaning behavior, removing parasites and dead tissue from larger reef fish that visit its territory, a role more commonly associated with cleaner wrasses and shrimp. Despite its small size, it is a conspicuous and frequently observed reef species due to its bright coloration and habit of hovering in open water near shelter. As in other true pipefish, the male broods fertilized eggs in a pouch beneath his tail.

The bluestripe pipefish is easily recognized by its small size and bold stripe pattern:

• Stripe: single bright blue longitudinal stripe from head to tail
• Body: tan, orange, or yellowish base color, slender and elongated
• Size: small, typically only 5-7 cm
• Fins: small fan-shaped tail fin, minimal dorsal fin
• Behavior: often hovers motionless in open water near a crevice, unlike many pipefish that stay pressed to substrate Its combination of small size, single blue stripe, and hovering posture near reef crevices distinguishes it from larger, more cryptically patterned pipefish.

Bluestripe pipefish are found across the Indo-Pacific and into the tropical eastern Pacific, typically on coral and rocky reefs at depths of 3-30 m. They favor crevices, small caves, and rubble areas where they can retreat quickly, often hovering just outside their shelter in open water to feed or await cleaning clients. The species tolerates a range of reef microhabitats, from clear lagoon reefs to more turbid coastal reef environments, and is commonly encountered by divers due to its conspicuous behavior near shelter sites.

Bluestripe pipefish are active, conspicuous pipefish that hover in open water near a shelter crevice rather than remaining pressed against the substrate like many relatives. They feed on small planktonic crustaceans and also perform cleaning behavior, picking parasites and dead skin from client fish that approach their station, a behavior that benefits both species. Individuals are often found in pairs that maintain a shared territory around a shelter site. Males brood fertilized eggs in a pouch beneath the tail, carrying them through development before releasing free-swimming juveniles.