Why is my Blue Spotted Jawfish swimming against the glass?

Pacing the glass is a sign of stress, usually indicating that the fish cannot find a suitable place to build its burrow. Ensure your sand bed is deep enough (10-15 cm) and contains mixed rubble sizes.

Can I keep more than one Blue Spotted Jawfish together?

Unless you have a confirmed mated pair or an extremely large aquarium (over 500 litres) with plenty of floor space, it is best to keep only one. They are highly territorial towards their own kind and will fight fiercely over territory.

Why has my jawfish disappeared?

It is normal for jawfish to stay completely hidden inside their burrows, especially when newly introduced or during the night when they cover the entrance. However, because they are notorious jumpers, always check the floor around the tank and the overflow box.

Will they eat my ornamental shrimp?

They are generally safe with standard-sized cleaner and peppermint shrimp. However, very small or juvenile shrimp might be mistaken for food if they wander too close to the burrow.

MarineMarineIntermediate

Blue Spotted Jawfish

Opistognathus rosenblatti

The Blue Spotted Jawfish is a charismatic, burrow-dwelling marine fish renowned for its brilliant neon-blue markings and architectural behaviour.

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Ideal Conditions

Temperature: 22 – 25 °C
pH range: 8.1 – 8.4
Hardness: 8 – 12 dGH
Salinity: 1.023 – 1.025 SG
Adult size: 8 – 10 cm
Minimum for a single specimen: 115 litres+
Lifespan: 5 – 8 years
Diet: Carnivore
Water flow: Moderate
Preferred setup: Requires a deep sand bed (at least 10-15 cm) of mixed grain sizes with small rubble to construct its burrow. A tight-fitting lid is absolutely essential.

About the Blue Spotted Jawfish

With its oversized head, large expressive eyes, and astonishing colouration, the Blue Spotted Jawfish is an incredibly rewarding species to keep. Native exclusively to the Gulf of California, this fish boasts a bright yellow or orange body completely covered in iridescent blue spots. They are industrious architects, spending much of their time moving mouthfuls of sand and rubble to engineer the perfect burrow. While comical to watch, their constant maintenance requires specific substrate conditions to prevent them from becoming stressed.

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Is it right for your tank?

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Where Blue Spotted Jawfish comes from

Native range

Gulf of California, Eastern Central Pacific

Countries / regions

Mexico

Habitat

Sandy bottoms and coral rubble zones near coastal reefs.

Endemic to the Sea of Cortez, where water temperatures can be slightly cooler than typical tropical reefs.

Similar species

Yellowhead Jawfish
Opistognathus aurifrons
Dusky Jawfish
Opistognathus whitehurstii

We’re adding more full species guides as the catalogue grows.

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

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Ocellaris Clownfish
Amphiprion ocellaris
Occupies higher levels of the water column and will not interfere with the jawfish's burrow.
Great
Carpenter's Flasher Wrasse
Paracheilinus carpenteri
Active, peaceful, and stays in the mid-to-upper water levels, leaving the jawfish undisturbed.
Great
Yellowhead Jawfish
Opistognathus aurifrons
Other jawfish will compete fiercely for burrowing territory unless the aquarium is exceptionally large.
Compatible with caution
Watchman Gobies
Cryptocentrus spp.
Competes for bottom space and may bicker over preferred burrowing locations.
Compatible with caution
Lionfish
Pterois volitans
Large predators will view the small, relatively slender jawfish as an easy meal.
Not recommended

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