Saltwater Fish
Rosenblatt's Jawfish

Species Description…

Scientific Name: Opistognathus rosenblatti
Common Name: Rosenblatt's Jawfish
Species Group: Jawfish
Habitat: Reef Safe
Care Level: Intermediate
Temperament: Peaceful
Diet Type: Carnivore
Role in Aquarium: Community Fish
Max Fish Length: 5 (inches)
Min Aquarium Size: 50 (gallons)
Native Range: Eastern Pacific (Gulf of California)
Opistognathus rosenblatti - Rosenblatt's Jawfish

Opistognathus rosenblatti (Rosenblatt's Jawfish)

Overview

  • Endemic to the Eastern Pacific, commonly found in sandy seabeds near rocky reef formations.
  • Notable for its elongated body and striking color pattern, blending hues of yellow and blue.
  • A burrow-dwelling species that constructs tunnels in soft sediment for shelter and safety.
  • Exhibits fascinating behavior, frequently peering out of its burrow to monitor surroundings.

Feeding

  • Carnivorous, preying on plankton, small crustaceans, and benthic invertebrates.
  • Readily consumes frozen mysis shrimp, finely chopped seafood, and enriched brine shrimp.
  • Thrives on multiple small feedings throughout the day to match its natural foraging behavior.
  • Prefers food that drifts near the burrow, simulating its natural hunting conditions.

Habitat

  • Prefers sandy and rubble-laden environments where it can dig burrows.
  • Often found at moderate depths along coastal reefs and sloping seabeds.
  • Requires a stable substrate to allow for burrow construction and secure shelter.
  • Frequently maintains a single burrow, retreating quickly when sensing danger.

Fish Care

  • Optimal water temperature: 76-82°F (24-28°C).
  • pH level: 8.1-8.4, with a specific gravity of 1.023-1.026.
  • Stable water parameters and minimal fluctuations are crucial to reduce stress.
  • Routine maintenance and high-quality filtration support long-term health.

Compatibility

  • Generally peaceful but may defend its burrow from other bottom-dwelling fish.
  • Best suited for tanks with calm, non-aggressive tank mates that do not disrupt its burrow.
  • May coexist with other jawfish if adequate space and hiding spots are provided.
  • Avoid housing with overly aggressive species that could intimidate or outcompete it for food.

Aquarium Behavior

  • Spends most of its time near its burrow, retreating quickly when startled.
  • Observes and interacts with other tank inhabitants while remaining close to shelter.
  • Can exhibit jumping behavior, so a securely covered aquarium is recommended.
  • Gradually becomes more confident, displaying natural behaviors in a stable, low-stress environment.