Ochre Striped Cardinalfish (Ostorhinchus Compressus) saltwater aquarium fish portrait

The Ochre Striped Cardinalfish, also traded as the Blue Eyed or Split Banded Cardinalfish, is a laterally compressed apogonid from the Western Pacific, with a range extending from Indonesia and the Philippines east to Samoa, north to southern Japan, and south to the Great Barrier Reef. Adults show a white to pink body crossed by brown to ochre longitudinal stripes, brown spotting on the caudal peduncle, and striking neon blue eyes. Juveniles are easily recognized by a yellow caudal peduncle bearing a single black spot. In nature the species occupies protected lagoons, shallow reef flats, and branching Porites thickets at depths of roughly 2 to 20 meters, and it may reach about 6 inches, although trade specimens are commonly seen just over 3 inches.

Plan on a 50-gallon aquarium or larger for adults, with additional volume if the goal is a small group, since this species is genuinely social and settles into a calm hierarchy among conspecifics. Build the rockwork to mimic its natural shelter: caves, shaded overhangs, and branching coral structures where the fish can hover motionless through the daylight hours. Subdued lighting encourages it to stay in the open rather than wedge itself permanently out of sight. Stability matters more than any single number here, and because the species reacts poorly to elevated nitrate and phosphate, efficient skimming paired with a consistent water change schedule is the practical approach.

Wild Ochre Striped Cardinalfish feed chiefly on zooplankton picked from the water column after dark. In the aquarium, a varied carnivore menu keeps condition up: frozen mysis, brine shrimp, and chopped krill form the core, supplemented with quality flake and pellet foods and vitamin-enriched preparations. Feeder shrimp are accepted readily, and larger individuals may take live feeder fish. Most specimens will learn to eat prepared pellets after a short acclimation period.

Because activity peaks at night, offer food at dusk or in the early morning so the fish is awake and hunting when the meal arrives. Small, frequent feedings suit a zooplanktivore better than one large offering. Watch closely during the first weeks and confirm that each fish is actually eating, as this slow and deliberate feeder can be pushed off food by quicker tankmates.

Frozen Mysis Shrimp Frozen Brine Shrimp Chopped Krill Vitamin-Enriched Frozen Preparations Carnivore Pellets Marine Flake Food Feeder Shrimp
This is a peaceful, unhurried fish that moves methodically rather than patrolling. During the day it tucks into caves, coral branches, or sea grass, occasionally sheltering among the spines of long-spined urchins, then emerges after dark to hunt. Kept singly it remains retiring; kept in a small group it establishes a strict but non-aggressive pecking order and spends far more time visible, which is the better display outcome in a larger tank.

Tankmates should be similarly docile and comparable in size. Boisterous or fast-feeding fish are the main hazard, since an Ochre Striped Cardinalfish that loses every competition at feeding time will slowly decline. It ignores corals and other sessile invertebrates entirely, but it is not fully reef safe: tiny ornamental shrimp fall within its prey range, so delicate cleaner shrimp, sexy shrimp, and small motile invertebrates are at risk in a tank housing adults.

FAQ

Frequently Asked Questions

About the Ochre Striped Cardinalfish

  • How large an aquarium does an Ochre Striped Cardinalfish need?
    Provide at least 50 gallons for an adult, and choose a larger system if you intend to keep a small group so the fish can school and sort out their hierarchy without crowding.
  • Can this cardinalfish be kept in a reef tank?
    It coexists peacefully with corals and other sessile invertebrates, but it is not considered fully reef safe because it will hunt very small ornamental shrimp and similar tiny motile invertebrates.
  • When is the best time to feed this species?
    Offer food at dusk or early morning to match its nocturnal hunting pattern, and verify that each fish is feeding rather than being outcompeted by faster tankmates.