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Glassy Sweeper s | ||||||||||
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Parapriacanthus Pempheris |
Deeply keeled, compressed bodies and large eyes typify sweepers, their form somehwat like hatchetfishThe name hatchetfish may refer to two unrelated groups of fishes: Marine hatchetfishes small deep-sea bioluminescent fishes ( Stomiiformes) of the family Sternoptychidae, subfamily Sternoptychinae. Freshwater hatchetfishes tropical characins of the large; both cycloid and and ctenoid scaleIn most biological nomenclature, a scale ( Greek lepid is a small rigid plate that grows out of an animal's skin to provide protection. In lepidopteran species, scales are plates on the surface of the insect wing, and provide coloration. Scales are quites may be present. The small, short dorsal finDorsal Fin of the Orca A dorsal fin is a fin located on the backs of fishes, whales, dolphins and porpoises. Its main purpose is to stabilise the animal against rolling and assist in sudden turns. Some animals have developed dorsal fins with protective fu begins before the the body's midpoint and may have 4-7 spines; the anal fin is extensive and usually has 3 spines. The mouth is subterminal and strongly oblique. Species of the genus Parapriacanthus have much more cylindrical bodies.
Some species possess photophoreA photophore is a light-emitting organ which appears as luminous spots on various marine fishes. The organ can be simple, or as complex as the human eye; eqipped with lenses, shutters, color filters and reflectors. The light can be produced from compoundss. All but the Curved Sweeper (Pempheris poeyi) possess a gas bladder. The largest species is the Common Bullseye (Pempheris multiradiata) at 28 centimetres in length; most other species measure 16 centimetres or less. Coloration is relatively subdued.