Balistes triggerfishes have both a common name and a scientific name that refers to the first spine of the dorsal fin being locked in place by the erection of the shorter second trigger spine, and unlocked by depressing the second spine. Balistes is taken directly from the Italian pesca ballista, the "crossbow fish". Ballista originally being a machine for throwing arrows.[7]
Species
Balistes contains the following four valid extant species;[4]
Western Atlantic, it ranges from Canada to southern Brazil, and in the eastern Atlantic it is found at Ascension, Cape Verde, Azores and south to Angola
Balistes triggerfishes have robust, rather deep, compressed, oblong-shaped bodies. There is a clear groove which runs from below the eye to just above the nostril and a small, front opening mouth which contains strong jaws, Thereare 8 large outer teeth on each jaw while the teeth in the isde of the jaw are notched with the largest side teeth in the centre. The giil slit is short and located in front of the base of the pectoral fin, The dorsal fin has 3 spines, the first spine is lockable in the erect position, the second spine is half the length of the first. The soft rays in the dorsal, anal and pectoral fins are branched. The caudal peduncle is laterally compressed and has no spines, tuvercles or ridges on it. The pelvic fins are vestigial and consist of four scales forming a case for the end of the pelvis The skin is thick and leathery with plate-like scales that are arranged in regular diagonal rows. The snout is completely covered in scales. The large, bony scales behind the gull slit for a tympanum. The lateral line is diffcult to discern.[10] These are modreatly large fishes with the largest species being the finescale triggerfish (B. polylepis) with a maximum published total length of 76 cm (30 in).[11]
Distribution and habitat
Balistes trifferfishes are found in the Atlantic Ocean and the Eastern Pacific Ocean, with three species, the grey triggerfish, bluespotted triggerfish and the queen triggerfish, in the Eastern Atlantic. Two of the Eastern Atlantic species, the grey and the queen triggerfishes, are also found in the Western Atlantic, and one species, the fine spotted triggerfish in the Eastern Pacific.[12] If the stone triggerfish is included then this is also found in the Eastern Pacific Ocean.[13] These fishes are found at depths between 0 and 200 m (0 and 656 ft) in coatsal waters.[14]
References
^L. F. de Beaufort. 1926. On a collection of marine fishes from the Miocene of South Celebes. In H. A. Brouwer (ed.), Geologische Onderzoekingen in den Oostelijken Oost-Indischen Archiepel 117-148
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