triggerfish


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triggerfish,

any of several species of tropical reef fishes with laterally compressed bodies, heavy scales, and tough skins. They are named for the mechanism of the three spines of the dorsal fin: when the fish is alarmed the first of these spines is locked upright by the second and drops only when the latter is pressed like a trigger. The function of this reaction is to lock the fish firmly in a mass of coral; when attacked, the fish dives into the coral and erects the spine, releasing it only when the danger has passed. Triggerfishes have powerful, chisellike teeth adapted for cracking the coral and mollusks on which they feed. They average 1 lb (0.45 kg) in weight and 1 ft (30 cm) in length and are common around the West Indies and Florida. The gray, or common, triggerfish is variably colored in mottled browns, yellows, or grays, but many other species are strikingly colored, e.g., the queen triggerfish in blue, green, and yellow. The ocean triggerfish, which unlike most triggerfishes found in waters away from reefs, among seaweed or debris; it is up to 2 ft (60 cm) long and may weigh as much as 13 lb (6 kg). Triggerfish are classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
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, subphylum Vertebrata, class Actinopterygii, order Tetraodontiformes, family Balistidae.
References in periodicals archive ?
The only thing that will change as a result of this reclassification," said Atran, "is that payback provisions for overharvest will no longer be in effect for red snapper and gray triggerfish.
Previous studies regarding the trophic habits of red porgy and gray triggerfish in the SAB were limited in scope or are dated and, therefore, may not reflect possible recent dietary shifts that result from natural or anthropogenic disturbances.
This paper provides the 1st record of adults of both Finescale Triggerfish and Louvar in British Columbia, with both found in the autumn of 2014, during the warm-water event detailed by Bond and others (2015) and Dewey (2015).
Now there are also IMSI (International Mobile Subscriber Identity) catchers - also called Stingray, Triggerfish cell phone spying devices.
We saw turtles, a giant purple jellyfish (which I couldn't swim away fast enough from), butterfly fish, triggerfish, sweetlips and harmless sharks.
When New England based ThinkTank released the Triggerfish surface-subsurface lure in 2009, no one had seen anything like it.
Several other species of grouper, jacks, gray triggerfish, Balistes capriscus; king mackerel, and red drum, Sciaenops ocellatus, had values less than or equal to 0.
The study looked at fish traditionally hunted by the local people including snappers, triggerfish, parrotfish and surgeonfish.
ASSESSING GENETIC DIVERGENCE BETWEEN GULF OF MEXICO AND SOUTH ATLANTIC GRAY TRIGGERFISH POPULATIONS BY USE OF MICROSATELLITE MARKERS
This past summer, for example, SEA crew members encountered a 5-gallon bucket carpeted with algae and other small organisms, but they also found an unusual community of about two dozen triggerfish that used the bucket as its base.
The SENSIMED Triggerfish is noninvasive contact lens device, developed by SENSIMED AG, Lausanne, Switzerland, with the Swiss Federal Institute of Technology, Zurich, to continuously monitor IOP for up to 24 hours.