Blue Spot Jawfish
The Blue-Spotted Jawfish, Opistognathus rosenblatti, Allen & Robertson 1991, of Mexico’s Sea of Cortez is a real striker, with brilliant blue dots over its overall dark brownish body. The males become bright white in the front half of their bodies during spawning and courtship. To six inches total length. Named in honour of Richard/Dick Rosenblatt of the Scripps Institute of Oceanography, an early (1960’s) collector of the species in Mexico.
This is a very social species, with several individuals living about evenly spaced a meter apart from each other in offshore sandy areas in open ocean and bays, living almost entirely within their dug out burrows. Unlike the commonly available member of the family, the Pearly Jaw of the Atlantic (Opistognathus aurifrons) which spends a good deal of time out and above their burrows year long in the wild, O. rosenblatti males only display during warm weather (summer months), when competitions for females include a change in colour and hovering a few feet above their burrow openings.
Though this fish is small, it really requires a large area of open expanse in a wide tank to feel comfortable. How much dimensionally? A good 3 feet between specimens and at least 2 feet front to back in the aquarium. There should be at least 8 inches of mixed fine sand and rubble substrate for them to create their burrows.
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