. A balanced marine aquarium / Barbara Jayne Palko. The biology of marine aquarium fishes collected in Marine [ Monroe] County, Florida / Deb Hess and John Stevely. Marine Behavior Cardinalfishes are slow, awkward swimmers (Livingston 1971). Perhaps this is related to their reluctance to leave caves and crevices during the day. However, as darkness approaches, the cardinalfishes assume a lighter color phase and move out from their daily shelter site (Starck and Davis,1966, Livingston 1971). 4. OPISTOGNATHIDAE: JAWFISHES Jawfishes are warm-water fishes, living in vertical bu
. A balanced marine aquarium / Barbara Jayne Palko. The biology of marine aquarium fishes collected in Marine [ Monroe] County, Florida / Deb Hess and John Stevely. Marine Behavior Cardinalfishes are slow, awkward swimmers (Livingston 1971). Perhaps this is related to their reluctance to leave caves and crevices during the day. However, as darkness approaches, the cardinalfishes assume a lighter color phase and move out from their daily shelter site (Starck and Davis,1966, Livingston 1971). 4. OPISTOGNATHIDAE: JAWFISHES Jawfishes are warm-water fishes, living in vertical burrows that they line with small stones or shells. These fishes can be fascinating in an aguarium because burrows are established and often competition for stones and shells to line the burrow follows. However, because jawfishes are a rather retiring (shy) species, care must be taken to see that they get enough food. Jawfishes have fared well on the aguarium market in the Keys, and the Yellow- head jawfish is freguently collected. Description of the Commercially Valuable Species and its Biogeography Jawfishes have large heads without spines or ridges. The face has an extremely steep profile with large eyes, a very large mouth, and an elongate body. In the Bahamas, Bohlke and Chaplin (1968) reported 5 species and Randall (1968) reported 4 species. Starck (1968) found 6 species on Alligator Reef. Only one species will be considered here. Yellowhead Jawfish, Opistognathus aurifrons Jordan and Thompson 1905 The body of the Yellowhead jawfish is light bluish- gray, shading to bright blue in the caudal fin (A) and rear of the dorsal and anal fins (B). There are numerous pale blue dots on the body and fins as well. The mouth, head, and back neck region (from the head to the base of the dorsal fin) are yellow (C). This fish approaches 10 cm (4 in.) in length. The Yellowhead jawfish is found in the Bahamas, Florida, Cuba, and the Virgin Islands. Local Habitat in the Florida Keys
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