
Opistognathus rosenblatti
Family: Opistognathidae ยท Jawfish
Also known as: Bluespotted Jawfish, Rosenblatt's Jawfish, Blue Dot Jawfish
The Blue Spotted Jawfish is widely considered one of the most beautiful jawfish species in the marine aquarium hobby, and it commands a premium price that reflects its limited geographic range and stunning coloration. This species features a warm golden-orange body densely covered with brilliant electric blue spots that shimmer and fluoresce under actinic lighting, creating an absolutely breathtaking display. Its large, expressive eyes and perpetual hovering posture above its burrow give it an endearing, almost puppy-like quality that captivates observers.
Like all jawfish, this species is a dedicated burrower that constructs and maintains an elaborate vertical tunnel in the substrate, meticulously reinforced with small pieces of rubble, shell fragments, and gravel. The Blue Spotted Jawfish spends much of its time hovering vertically just above its burrow entrance, darting back inside tail-first at any perceived threat. It is fascinating to watch these fish excavate and redecorate their burrows, constantly rearranging rubble pieces with their oversized mouths. A deep sand bed of at least four inches mixed with crushed coral and small rubble is absolutely essential.
Despite its exotic appearance and relatively high price point, the Blue Spotted Jawfish is reasonably hardy once established in a properly set up aquarium. It requires a tank of at least 30 gallons with a secure, tight-fitting lid, as this species is an infamous jumper that will escape through remarkably small gaps, particularly when startled or newly introduced. The species is reef-safe and peaceful, making it an excellent addition to community reef tanks with other non-aggressive species.
The Blue Spotted Jawfish is a planktivore and micro-carnivore that feeds on small crustaceans, zooplankton, and passing food particles in the wild. In captivity, offer frozen mysis shrimp, enriched brine shrimp, finely chopped seafood, cyclops, and small marine pellets. Target food near the burrow entrance, as this species typically does not stray far to feed. Feed two to three times daily.
The Blue Spotted Jawfish is peaceful and compatible with most community reef fish. It may be territorial toward other jawfish in close proximity, so provide ample space between burrow sites if keeping multiples. Best housed with other peaceful species like clownfish, gobies, blennies, and small wrasses. Avoid aggressive tankmates such as dottybacks or large wrasses that may bully it or steal food near its burrow.
Check CompatibilityBlue Spotted Jawfish are mouthbrooders. The male incubates fertilized eggs in his mouth for approximately 7 to 10 days, during which he does not eat. During incubation, the male can occasionally be seen rotating the egg mass in his mouth to ensure proper oxygenation. Larvae are released at night and are planktonic, requiring rotifers and copepod nauplii for early rearing. Captive breeding has been achieved but remains rare.