Longhorn cowfish
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03:42, 28 March 2007 (UTC)71.35.114.15P'
The longhorn cowfish, a variety of Boxfish from the Ostraciidi family, recognisable by its long horns that protrude from the front of its head, rather like those of a cow or bull. They are usually around 10cm/4ins long. Whilst badly suited to the home aquarium, the cowfish is becoming increasingly popular as a pet.
An example of the longhorn cowfish can be found at The Deep, a large aquarium in Hull, East Yorkshire.
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Longhorn Cowfish Lactoria cornuta
The Longhorn Cowfish, a boxfish, family Ostraciidi, is a resident of the Indo-Pacific region and 10 cm, 4 in., long (up to 20 in., 51 cm) with “horns” at both ends of the body, yellow to tan with some (white) spots. Adults are often solitary and territorial, live around sand or rubble bottom up to a depth of 50 m. They are omnivorous, feeding upon benthic algae, various microorganisms, and foraminiferans that it strains from sediments, sponges, polychaete worms from sand flats, mollusks, small crustaceans, and small fishes, able to feed on benthic invertebrates by blowing jets of water into the sandy substrate.
There is no known sexual dimorphism, so both male and female display a yellow to olive base color, which is decorated with white or bluish spots. Paired courtship just before or after sunset. Eggs and larvae are pelagic.
Primary habitat is coral reefs in lagoons, on reef flats, and on protected seaward reefs. Juveniles associate with Acropora corals. Depth range is 3.3–148 ft (1–45 m, perhaps up to 100 m).
If severely stressed, this species can exude deadly toxin, ostracitoxin, an ichthyotoxic, hemolytic, heat-stable, non-dialyzable, non-protein poison in the mucous secretions of their skin. It is apparently unique among known fish poisons; it is toxic to boxfish and resembles red tide and sea cucumber toxins in general properties.
Other unusual features: One distinction from other fish is the lack of a gill cover, which is replaced by a small slit or hole.
Rather than a skeleton, they have a body of exterior fused plates that form a box.
Their unique method of swimming, called ostraciform swimming, causes them to look as if they are hovering. They have no pelvic skeleton, so they lack pelvic fins. They are such slow swimmers cowfish are easily caught by hand, making a grunting noise when captured. This is the most well-known cowfish species in the aquarium trade.
Dorsal spines (total): 0 - 0; Dorsal soft rays (total): 8 - 9; Anal spines: 0; Anal soft rays: 8 – 9. Cryptic coloring ranges from green and olive to orange with blue spots (Ref. 3141). Caudal fin rays 9-10 (Ref. 1602)
Range: Red Sea and East Africa eastward through Indonesia to Marquesas, northward to southern Japan. Including Tuamotus, southern Korea, north to the Ryukyu Islands of southern Japan, south to Australia and Lord Howe Island, and off southern Africa in the Atlantic. Tropical and subtropical waters
Aka Ostracion cornutus, Lactoria cornutus
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