Arowana

From Wikipedia, the free encyclopedia

You have new messages (last change).
This article is about fishes. For the genus of jumping spiders, see Aruana (spider).
iArowana
Silver arowana, Osteoglossum bicirrhosum
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Osteoglossiformes
Family: Osteoglossidae
Genera

Subfamily Heterotidinae
 Arapaima
 Heterotis
Subfamily Osteoglossinae
 Osteoglossum
 Scleropages

Arowanas, also known as aruanas or arawanas are freshwater bony fish of the family Osteoglossidae, sometimes known as "bony tongues." In this family of fishes, the head is bony and the elongate body is covered by large, heavy scales, with a mosaic pattern of canals. The dorsal and the anal fins have soft rays and are long based, while the pectoral and ventral fins are small. The name 'bony tongues' is derived from a toothed bone on the floor of the mouth, the 'tongue', equipped with teeth that bite against teeth on the roof of the mouth. The fish can obtain oxygen from air by sucking it into the swim bladder, which is lined with capillaries like lung tissue. The arapaima is an "obligatory air breather" [1].

Contents

[edit] Classification

Osteoglossids are basal (primitive) fish from the lower Tertiary and are placed in the actinopterygiid order Osteoglossiformes. There are ten described living species: three from South America, one from Africa, four from Asia, and the remaining two from Australia.

Osteoglossidae is the only freshwater fish family found on both sides of the Wallace Line.[2]

[edit] Behavior

Osteoglossids are carnivorous, often being specialized surface feeders. They are excellent jumpers; it has been reported that Osteoglossum species have been seen leaping more than 6 feet (almost 2 metres) from the water surface to pick off insects and birds from overhanging branches in South America, hence the nickname "water monkeys". Arowanas have been rumored to capture prey as large as low flying bats and small birds. All species are large, and the arapaima is a contender for the world's largest freshwater fish title. Arowana typically grow around 3 to 4 feet and around 48", but this is only accountable in captivity.

Several species of osteoglossid exhibit extensive parental care. They build nests and protect the young after they hatch. Some species are mouth brooders, the parents holding sometimes hundreds of eggs in their mouths. The young may make several tentative trips outside the parent's mouth to investigate the surroundings before leaving permanently.

[edit] In the aquarium

Arowanas tend to merge in groups of 5 to 8; any fewer may show an excess of dominance and aggression. Keep this fish in a minimum of about 750 litres (200 gal.) with good filtration. This fish should not be purchased by an amateur fish hobbyist. Some compatable fish to partner with this fish are pacu, oscars, plecos, jaguar cichlids, green terrors, gar, and any other semi-aggressive fish that cannot fit in the arowana's mouth.

[edit] Folklore

For the Chinese and those of related cultures, the dragon is a symbol of good luck and prosperity. In the eyes of the Chinese, the dragon fish has the appearance and majesty of the Chinese Dragon, especially the large scales and barbels.

Arowanas are also used for feng shui to bring good luck and wealth.

[edit] Species

The family contains two subfamilies, Heterotidinae and Osteoglossinae, with all but two of the ten extant species being members of the latter. Species are given with one or more prominent common names.

†This species is one of several known also as the Asian arowana or Asian bonytongue.
‡This species is one of two sometimes called the Australian arowana or Australian bonytongue.

A genetic study shows that the lineage leading to the arapaima and African arowana diverged about 220 million years ago, during the Late Triassic; the lineage leading to the silver and black arowanas of South America diverged about 170 million years ago, during the Middle Jurassic. The lineage leading to the Australian arowanas diverged from that leading to the Asian arowanas about 140 million years ago, during the Early Cretaceous.[3]

[edit] Fossil record

At least five fish paleospecies, known only from fossils, are classifed as Osteoglossids; these date back at least as far as the Late Cretaceous. Other fossils from as far back as the Late Jurassic or Early Cretaceous are widely considered to belong to the arowana superorder Osteoglossomorpha. Osteoglossomorph fossils have been found on all continents except Antarctica. [4]

[edit] Genus Brychaetus

Brychaetus muelleri (Agassiz, 1845) is known from the Late Cretaceous to the Paleocene. Its fossils have been found in Europe, North America, and northern Africa. This freshwater fish had very long, blunt teeth. Platops and Pomphractus are synonyms. [5]

[edit] Genus Joffrichthys

This North American genus includes two species, J. symmetropterus and J. triangulpterus. The latter species is known from the Paleocene of the Sentinel Butte Formation of North Dakota, U.S.A. [6]

[edit] Genus Phareodus

This genus includes at least two species, P. testis (Leidy, 1873) and P. encaustus. Representatives have been found from the middle Eocene to the Oligocene of Australia and North America, including the Green River Formation in Wyoming, U.S.A. [5]

P. testis was a freshwater fish with an oval outline, a small head, and a slightly pointed snout. Its dorsal and anal fins were situated posteriorly, with the anal fin being larger. Its caudal fin was slightly forked. It had small pelvic fins but long, narrow pectorals. It is synonymous with Dapedoglossus. [5]

[edit] Trivia

  • In the video game Animal Crossing, an arowana is a rare and valuable fish.
  • In the video game Metal Gear Solid 3: Snake Eater, the arowana is one of the more common fish found in the game.
  • In the boxing manga and anime Fighting Spirit, the character Tatsuya Kimura keeps an arowana as a pet. When feeding it one day, he was impressed by how high it could jump from its tank to grab the food he held above it. It inspired him to create a punch combination he named the Dragon Fish blow, which consists of a series of body blows to lower the attention of his opponent, followed by a punch to the jaw from above using the other hand. The punch to the jaw arcs in the same manner his arowana jumped from its tank.

[edit] References

  1. ^ Berra, Tim M. (2001). Freshwater Fish Distribution. San Diego: Academic Press. ISBN 0120931567
  2. ^ Ismail, Mohd Zakaria (1989). "Systematics, Zoogeography, and Conservation of the Freshwater Fishes of Peninsular Malaysia" (doctoral dissertation). Colorado State University. P. 25.
  3. ^ Kumazawa, Yoshinori (2003). "The reason the freshwater fish arowana live across the sea". Quarterly Journal Biohistory (Winter). Retrieved on 2006-07-02.
  4. ^ Guo-Qing, Li; Wilson, Mark V. H. (1998). Osteoglossomorpha (article). Tree of Life. Retrieved on 2006-04-14.
  5. ^ a b c Frickhinger, Karl Albert (1995). Fossil Atlas: Fishes, Trans. Dr. R.P.S. Jefferies, Blacksburg, Virginia: Tetra Press.
  6. ^ Newbreya, M. G., Bozekb, M. A. (2000). "A New Species of Joffrichthys (Teleostei: Osteoglossidae) from the Sentinel Butte Formation, (Paleocene) of North Dakota, USA.". Journal of Vertebrate Paleontology 20 (1): 12-20. Retrieved on April 14, 2006.

[edit] External links

Retrieved from "http://en.wikipedia.org../../../a/r/o/Arowana.html"