arapaima


Also found in: Dictionary, Wikipedia.

arapaima

(ăr'əpī`mə), tropical fish, genus Arapaima, of the Amazon basin. Arapaimas are perhaps the largest of the strictly freshwater fishes, reportedly reaching a length of 15 ft (4.5 m), but averaging 7 to 8 ft (2–2.4 m) in length and 200 lb (90 kg) in weight. The dorsal and anal fins of the arapaimas are placed so far back that they appear to be part of the tail fin, giving a massive appearance to the posterior region. The scales are olive-green, turning increasingly reddish in the tail region and becoming crimson near the tail fin. The swim bladderswim bladder,
large, thin-walled sac in some fishes that may function in several ways, e.g., as a buoyant float, a sound producer and receptor, and a respiratory organ. The swim bladder, or air bladder, is located in the dorsal portion of the body cavity and is filled with gases.
..... Click the link for more information.
 is open to the pharynx; it is rich in blood vessels and serves as a lung. Arapaimas use the fins to hollow out a nest in clear, shallow, sandy-bottomed areas. They are graceful swimmers despite their bulk, and they are valued as an aquarium fish as well as for food. Arapaimas 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.
..... Click the link for more information.
, subphylum Vertebrata, class Actinopterygii, order Osteoglossiformes, family Arapaimidae.
References in periodicals archive ?
City mayor Datuk Nordin Siman said the arapaima, native to the Amazon in South America, was likely discarded into the park lake when young and lived there for many years with local fishes.
Digestibility of animal and vegetable protein ingredients by pirarucu juveniles, Arapaima gigas.
The experiment was conducted at the Fish Technology Laboratory, Technology and Innovation Coordination-COTI, National Institute for Amazonian Research (INPA), where the procedures for obtaining acid silage made of Arapaima gigas pirarucu waste were developed (Schinz, 1822) as well its physical and chemical characterization; and at the Poultry Sector, Department of Animal and Plant Productionl (DPAV), Faculty of Agricultural Sciences (FCA), Federal University of Amazonas (UFAM), located in the Southern Sector of the University Campus, Manaus, state of Amazonas, Brazil, where the digestibility assay was performed.
The absence of mortality during transportation found in this study was also recorded for pirarucu (Arapaima gigas), but with a shorter transportation time of 3 hours (Brandao, Gomes, Crescencio, & Carvalho, 2008).
With a primitive lung, arapaima breath air from the surface.
This wide range of species includes mostly bony fish (Class Osteichthyes), both rayfinned fish (Subclass Actinopterygii), the overwhelming majority of cases, and lobe-finned fish (Subclass Sarcopterygii) like Arapaima gigas [109].