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 fishery data was obtained from 5 boats which exploited the spawning aggregations of mutton snapper and grey triggerfish daily; the 5 boats were different for the fishery of each species.
To investigate the clinical validity of using ocular volume change as a biomarker, Sensimed researchers have analysed the data captured by Triggerfish devices worn by more than 2000 patients alongside their visual fields records.
Species such as red snapper and gray triggerfish had relatively few and small discrepancies between the BP's and CR's (Fig.
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.
And then there were Slingjaw Wrasses and Napoleon Fish and Threadfin, Crown and Lined Butterflyfish, Humbugs and Footballers, parrotfish and Sergeant-majors, morays and mojarras, tunas, triggerfish and trevallies.
Shortlisted finalists are currently being reviewed by a panel of international and local judges, including executives from Bento Box, Triggerfish Studios, and Cartoon Network Latin America and the Caribbean; Oscar nominee Studio Manager from Guatemala; and renowned VFX artists and lead animators.
However, northeastern Pacific fishes such as Finescale Triggerfish (Balistes polylepis), Louvar (Luvarus imperialis), Skipjack Tuna (Katsuwonus pelamis), Albacore Tuna (Thunnus alalunga), Pacific Mackerel (Scomber japonicus), Thresher Shark (Alopias vulpinus), Ocean Sunfish (Mola mola), Pacific Saury (Cololabis saira) and Pacific Pompano (Peprilus simillimus) are known to shift their range north during El Nino events and other warm periods (Karinen and others 1985; Pearcy and others 1985; Schoener and Fluharty 1985; Pearcy and Schoener 1987; Medred 2014; Bond and others 2015; Welch 2015a).
Ophthalmic surgeon and glaucoma specialist Dr Andrew Tatham has been treating patients with the Triggerfish lens at the Edinburgh Clinic and The Princess Alexandra Eye Pavilion in Edinburgh over the past three months.
Once again Triggerfish Animation Studios have shown that they have what it takes to make an internationally acclaimed animation.
Atlanta, GA, June 26, 2013 --(PR.com)-- Sun Pet announces rare triggerfish available for sale from Bali, Indonesia.
When New England based ThinkTank released the Triggerfish surface-subsurface lure in 2009, no one had seen anything like it.
The study looked at fish traditionally hunted by the local people including snappers, triggerfish, parrotfish and surgeonfish.