Oxygymnocypris stewartii

Last updated • 1 min readFrom Wikipedia, The Free Encyclopedia

Oxygymnocypris stewartii
Oxygymnocypris stewartii.jpg
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Cypriniformes
Family: Cyprinidae
Genus: Oxygymnocypris
W. H. Tsao, 1964
Species:
O. stewartii
Binomial name
Oxygymnocypris stewartii
(Lloyd, 1908)
Synonyms

Schizopygopsis stewartiiLloyd, 1908
Gymnocypris stewartii(Lloyd, 1908)

Contents

Oxygymnocypris stewartii is a species of cyprinid fish endemic to Tibet [2] and occurs in the Yarlung Tsangpo River (=upper Brahmaputra) and its tributaries at altitudes above 3,600 m (11,800 ft) in the Qinghai-Tibet Plateau. [1] [3] It is the only species in its genus. [4]

Life history and ecology

Oxygymnocypris stewartii grows to 59 cm (1.94 ft) in standard length, [3] 67.6 cm (2.22 ft) in total length and 3 kg (6.6 lb) in weight. [2] It is a long-lived (to 25 years), late-maturing species that reproduces annually. [3]

Oxygymnocypris stewartii inhabits the deeper areas of clear, fast-flowing rivers with a rocky substrate. [1] It is a generalized and opportunistic predator feeding both on fish and aquatic insects. Smaller specimens feed mostly on cobitid nemacheilid loaches and caddisflies of family Hydropsychidae, whereas larger individuals switch more towards cyprinid fishes and chironomid larvae. Triplophysa stenura is the most prevalent prey species, present in 47% of stomachs, but Schizopygopsis younghusbandi contributes most (59%) to prey weight. Insects are more important in winter and spring, and fishes in summer and autumn. [3]

Fishery

Oxygymnocypris stewartii is heavily used as a food fish and is thought to be overfished. [1]

Related Research Articles

Lake Tana Largest lake in Ethiopia and major source of Blue Nile

Lake Tana is the largest lake in Ethiopia and the source of the Blue Nile. Located in Amhara Region in the north-western Ethiopian Highlands, the lake is approximately 84 kilometres long and 66 kilometres wide, with a maximum depth of 15 metres, and an elevation of 1,788 metres. Lake Tana is fed by the Gilgel Abay, Reb and Gumara rivers. Its surface area ranges from 3,000 to 3,500 square kilometres, depending on season and rainfall. The lake level has been regulated since the construction of the control weir where the lake discharges into the Blue Nile. This controls the flow to the Blue Nile Falls and hydro-power station.

Muskellunge Species of fish

The muskellunge(Esox masquinongy), often shortened to muskie, musky or lunge, is a species of large freshwater predatory fish native to North America. It is the largest member of the pike family, Esocidae.

Northern pike Species of fish

The northern pike is a species of carnivorous fish of the genus Esox. They are typical of brackish and fresh waters of the Northern Hemisphere. They are known simply as a pike in Britain, Ireland, and most of Eastern Europe, Canada and the United States.

Chinese paddlefish Species of fish

The Chinese paddlefish, also known as Chinese swordfish, is a reportedly extinct species of fish that was native to the Yangtze and Yellow River basins in China. At maturity, the species measured an average length of 3 m (9.8 ft), making it one of the largest species of primarily freshwater fishes. It was the only species in the genus Psephurus and one of two living species in the paddlefish family (Polyodontidae), the other being the American paddlefish. It was an anadromous species, meaning that it spent part of its adult life at sea, while migrating upriver to spawn. Unlike its close relative, the Chinese paddlefish was largely piscivorous, and mainly preyed on small to medium-sized fish.

Saltwater crocodile Reptile of South Asia, Southeast Asia and Oceania

The saltwater crocodile is a crocodilian native to saltwater habitats and brackish wetlands from India's east coast across Southeast Asia and the Sundaic region to northern Australia and Micronesia. It has been listed as Least Concern on the IUCN Red List since 1996. It was hunted for its skin throughout its range up to the 1970s, and is threatened by illegal killing and habitat loss. It is regarded as dangerous for people who share the same environment.

Nile crocodile Reptile of Africa

The Nile crocodile is a large crocodilian native to freshwater habitats in Africa, where it is present in 26 countries. It is widely distributed throughout sub-Saharan Africa, occurring mostly in the central, eastern, and southern regions of the continent, and lives in different types of aquatic environments such as lakes, rivers, swamps, and marshlands. Present in west Africa, the niloticus is there cohabitant with two other crocodilians. Although capable of living in saline environments, this species is rarely found in saltwater, but occasionally inhabits deltas and brackish lakes. The range of this species once stretched northward throughout the Nile, as far north as the Nile Delta. On average, the adult male Nile crocodile is between 2.94 and 4.4 m in length and weighs 225 to 414.5 kg including stomach stones. However, specimens exceeding 6.1 m (20 ft) in length and weighing up to 1,089 kg (2,401 lb) have been recorded. It is the largest freshwater predator in Africa, and may be considered the second-largest extant reptile in the world, after the saltwater crocodile. Sexual dimorphism is prevalent, and females are usually about 30% smaller than males. They have thick, scaly, heavily armoured skin.

Beluga (sturgeon) Species of fish in the sturgeon family

The beluga, also known as the beluga sturgeon or great sturgeon, is a species of anadromous fish in the sturgeon family (Acipenseridae) of order Acipenseriformes. It is found primarily in the Caspian and Black Sea basins, and formerly in the Adriatic Sea. Based on maximum size, it is the third-most-massive living species of bony fish. Heavily fished for the female's valuable roe, known as beluga caviar, wild populations have been greatly reduced by overfishing and poaching.

Goliath heron Species of bird

The Goliath heron, also known as the giant heron, is a very large wading bird of the heron family, Ardeidae. It is found in sub-Saharan Africa, with smaller numbers in Southwest and South Asia.

<i>Varanus salvadorii</i> Species of lizard

Varanus salvadorii, also known as the crocodile monitor, Papua(n) monitor, Salvadori's monitor, and artellia, is a species of monitor lizard endemic to New Guinea. It is the largest monitor lizard known from New Guinea, and is one of the longest lizards in the world, verified at up to 244 cm (8 ft). The tail of the species is exceptionally long, so some specimens have been claimed to exceed the length of the world's largest lizard, the Komodo dragon; however, V. salvadorii is far less massive.

Mountain whitefish Species of fish

The mountain whitefish is one of the most widely distributed salmonid fish of western North America. It is found from the Mackenzie River drainage in Northwest Territories, Canada south through western Canada and the northwestern USA in the Pacific, Hudson Bay and upper Missouri River basins to the Truckee River drainage in Nevada and Sevier River drainage in Utah.

Bala shark Species of fish

The bala shark, Balantiocheilos melanopterus, also known as the tricolor shark, tricolor sharkminnow, silver shark, or shark minnow, is a fish of the family Cyprinidae, and is one of the two species in the genus Balantiocheilos. This species is not a true shark, but is commonly so called because of its torpedo-shaped body and large fins.

Florida gar Species of fish

The Florida gar is a species of gar found in the US from the Savannah River and Ochlockonee River watersheds of Georgia and throughout peninsular Florida. Florida gar can reach a length over 3 ft (91 cm). The young feed on zooplankton and insect larvae, as well as small fish. Adults mainly eat fish, shrimp, and crayfish. Although edible, they are not popular as food. The roe is highly toxic to many animals, including humans and birds. Gar are mentioned in the John Anderson song "Seminole Wind".

The Colorado pikeminnow is the largest cyprinid fish of North America and one of the largest in the world, with reports of individuals up to 6 ft (1.8 m) long and weighing over 100 pounds (45 kg). Native to the Colorado River Basin of the southwestern United States and adjacent Mexico, it was formerly an important food fish for both Native Americans and European settlers. Once abundant and widespread in the basin, its numbers have declined to the point where it has been extirpated from the Mexican part of its range and was listed as endangered in the US part in 1967, a fate shared by the three other large Colorado Basin endemic fish species: bonytail chub, humpback chub, and razorback sucker. The Colorado pikeminnow is currently listed as vulnerable by the IUCN.

<i>Serranochromis</i> Genus of fishes

Serranochromis is a genus of relatively large, robust cichlids from freshwater habitats in mainland Southern Africa, ranging as far north as DR Congo and Tanzania, with the highest species richness in the upper Zambezi, Okavango and Congo basins. They are typically known as largemouths or, especially among fishers, breams. Serranochromis are mostly piscivores and they are important in local fisheries.

<i>Schizopygopsis</i> Genus of fishes

Schizopygopsis is a genus of cyprinid fish. Most species are endemic to river basins in the Himalayas and Qinghai–Tibet Plateau of China, but S. stoliczkai extends into the highlands of Afghanistan, Iran, northern India, Kyrgyzstan, Pakistan and Tajikistan.

Schizopygopsis younghusbandi is a species of ray-finned fish endemic to Tibet. It occurs in the Yarlung Tsangpo River drainage and in endorheic lakes in its vicinity. Schizopygopsis younghusbandi grows to about 50 cm (1.6 ft) in total length.

Triplophysa stenura is a species of ray-finned fish in the genus Triplophysa. It lives in swift-flowing streams and is known from the Upper Yangtze, Upper Mekong, Upper Salween and Upper Brahmaputra river drainages in China and Vietnam. Whether this apparently widespread species really is one species needs to be studied. It grows to 13.8 cm (5.4 in) SL.

Platypharodon extremus is a species of cyprinid fish endemic to the upper Yellow River basin in the Qinghai–Tibet Plateau of China. It is the only member of its genus, but is related to other schizothoracines like Aspiorhynchus, Chuanchia, Gymnocypris, Oxygymnocypris, Ptychobarbus, Schizopyge, Schizopygopsis and Schizothorax.

Schilbe intermedius or the silver butter catfish is a widespread species of African catfish. It seems closely related to Schilbe uranoscopus and these two species are sympatric over part of their ranges.

Humpback mahseer Species of fish

Hypselobarbus mussullah is a species of freshwater ray-finned fish from the Indian endemic genus Hypselobarbus in the carp and minnow family Cyprinidae.

References

  1. 1 2 3 4 Ng, H.H. (2010). "Oxygymnocypris stewartii". IUCN Red List of Threatened Species . 2010: e.T168408A6487005. doi: 10.2305/IUCN.UK.2010-4.RLTS.T168408A6487005.en . Retrieved 19 November 2021.
  2. 1 2 Froese, Rainer and Pauly, Daniel, eds. (2019). "Oxygymnocypris stewartii" in FishBase . May 2019 version.
  3. 1 2 3 4 Huo, B.; Xie, C. X.; Madenjian, C. P.; Ma, B. S.; Yang, X. F.; Huang, H. P. (2014). "Feeding habits of an endemic fish, Oxygymnocypris stewartii, in the Yarlung Zangbo River in Tibet, China". Environmental Biology of Fishes. 97 (11): 1279–1293. doi:10.1007/s10641-013-0213-8. S2CID   15291571.
  4. Eschmeyer, W. N. (2 June 2015). "Catalog of Fishes". California Academy of Sciences. Retrieved 8 June 2015.