Hepsetus cuvieri | |
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Hepsetus cuvieri, in an Aquarium of Guma Lagoon Camp in the Okavango Delta | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Actinopterygii |
Order: | Characiformes |
Family: | Hepsetidae |
Genus: | Hepsetus |
Species: | H. cuvieri |
Binomial name | |
Hepsetus cuvieri | |
Synonyms | |
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Hepsetus cuvieri, the African pike, Southern African pike or Kafue pike characin, is a predatory species of freshwater ray-finned fish belonging to the monotypic family Hepsetidae, the African pike characins. This fish is found in southern Africa. It was formerly classified within the single widespread African species Hepsetus odoe but this has now been split into a number of valid species.
Hepsetus cuvieri was first formally species described as Hydrocyonoides cuvieri in 1861 by the French naturalist François-Louis Laporte, comte de Castelnau with Lake Ngami in Botswana given as the type locality. [4] It was long believed that only a single widespread species existed within the genus Hepsetus , H. odoe , but studies in 2011–2013 have shown that this species is restricted to parts of West and Central Africa. The well-known species of southern Africa, including Kafue River, is Hepsetus cuvieri. [5] The genus Hepsetus is the only genus classified within the family Hepsetidae, within the superfamily Alestoidea of the suborder Characoidei in the order Characiformes, the characins. [6]
Hepsetis cuvieri has the genus name Hepsetus which was proposed by William John Swainson in 1838, Swanson did not explain the etymology of this name but it is most lilely derived from the ancient Greek hepsētós, a small fish, such as the anchovy, which is boiled for human consumption. This name, however, used for piscivorous fish resembling pikes, this may be an allusion to the Greek poet Archippus, who wrote: “An hepsetus fell in with an anchovy / And quick devoured him,” and/or to the convergent South American characid Oligosarcus hepsetus . The specific name honours the French zoologist Georges Cuvier (1769-1832). [7]
Hepsetus cuvieri is found in the southern third of Africa where it inhabits the Quanza, Cunene, Okavango, upper Zambezi, Kafue and Congo River basins. In the Congo River basin, it is only known from the southernmost part of the Kasai system and the lower Luapula. [8]
Hepsetus cuvieri can be distinguished from Hepsetus odoe as it has a lower count of gill rakers on the first gill arch, of 8–13 as opposed to 14–21; a normally higher number of scales between the lateral line and the dorsal fin, 10.5–11.5 as opposed to 7.5–10.5; a typically higher number of scales from the adipose fin and the lateral line, 6.5–7.5 as opposed to 4.5–6.5; and a distinctive colour pattern characterized by a mottled appearance of the dark brown blotches on the lateral surface of the body versus distinct vertical brown stripes in that region in H. odoe. [2]
This species reaches maturity at a standard length of 25 cm (10 in) and the maximum recorded size is 37 cm (15 in). [2]
Hepsetus cuvieri prefers quiet, deep water, such as channels and oxbow lakes; the juveniles and fry inhabit dense marginal vegetation. The adults are mainly piscivorous while juveniles feed on smaller prey such as invertebrates and small fish. [8] H. cuvieri is a lurking, ambush predator found in marginal swamps and lagoons of large floodplain rivers. [9] It breeds over the summer months, spawning more than once in a free-floating bubblenest which the adults guard; [10] it is relatively short-lived, only living for 4–5 years. [8]
Immediately before spawning, the male and female pair up and become territorial, building large bubblenests amongst surface vegetation. They deposit the eggs into the nest and the fry move to the base of the nest upon hatching. Here they attach themselves via a gland on the top of their heads. The nest is guarded by the parents up to the point of hatching. The fry remain attached to the nest for around 4 days after which point they begin to disperse, as the nest starts to disintegrate. The fry continue to use on the sticky gland on their heads to attach themselves to pieces of vegetation etc., for a short time. [11] Hepsetus cuvieri lives in the more unpredictable seasonal swamp and has flexible spawning times because their bubblenests allow them to reproduce even when levels of dissolved oxygen are low, so they do not have a distinct breeding season. [12]
Hepsetus cuvieri overlaps in its distribution and habitat with the African tigerfish Hydrocynus vittatus and there is also a large degree of overlap in prey. The tigerfish prefers open, better oxygenated water and hunts by rapid pursuit of prey while H. cuvieri prefers dense vegetation where it is an ambush predator. H. vittatus is also known to prey on H. cuvieri, while it is almost unknown for H. cuvieri to prey on tigerfish. [13]
Hepsetus cuvieri has a wide geographical range and there are no major, widespread threats to the populations of this fish which have been identified. The International Union for Conservation of Nature, therefore, classifies this species as Least Concern. [1]
Characiformes is an order of ray-finned fish, comprising the characins and their allies. Grouped in 18 recognized families, more than 2000 different species are described, including the well-known piranha and tetras.
The Zambezi is the fourth-longest river in Africa, the longest east-flowing river in Africa and the largest flowing into the Indian Ocean from Africa. Its drainage basin covers 1,390,000 km2 (540,000 sq mi), slightly less than half of the Nile's. The 2,574 km (1,599 mi) river rises in Zambia and flows through eastern Angola, along the north-eastern border of Namibia and the northern border of Botswana, then along the border between Zambia and Zimbabwe to Mozambique, where it crosses the country to empty into the Indian Ocean.
Tigerfish can refer to fish from various families, and derives from official and colloquial associations of these with the tiger. However, the primary species designated by the name "tigerfish" are African and belong to the family Alestidae.
The African fish eagle or the African sea eagle is a large species of eagle found throughout sub-Saharan Africa wherever large bodies of open water with an abundant food supply occur. It is the national bird of Malawi, Namibia, Zambia, and Zimbabwe. As a result of its large range, it is known in many languages. Examples of names include: Vis Arend in Afrikaans, nkwazi in Chewa, aigle pêcheur in French, hungwe in Shona, inkwazi in isiZulu, and ntšhu in Northern Sotho. This species may resemble the bald eagle in appearance; though related, the two species occur on different continents, with the bald eagle being resident in North America.
Bubble nests, also called foam nests, are created by some fish and frog species as floating masses of bubbles blown with an oral secretion, saliva bubbles, and occasionally aquatic plants. Fish that build and guard bubble nests are known as aphrophils. Aphrophils include gouramis and the synbranchid eel Monopterus alba in Asia, Microctenopoma (Anabantidae), Polycentropsis (Nandidae), and Hepsetus odoe in Africa, and callichthyines and the electric eel in South America. Most, if not all, fish that construct floating bubble nests live in tropical, oxygen-depleted standing waters. Osphronemidae, containing the bettas and gouramis, are the most commonly recognized family of bubble nest makers, though some members of that family mouthbrood instead. The nests are constructed as a place for fertilized eggs to be deposited while incubating and guarded by one or both parents until the fry hatch.
The slaty egret is a small, dark egret found in southern Africa. It is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies. It is classified as Vulnerable, the biggest threat being habitat loss.
Pelvicachromis pulcher is a freshwater fish of the cichlid family, endemic to Nigeria and Cameroon. It is popular amongst aquarium hobbyists, and is most commonly sold under the name kribensis, although it has other common names, including various derivatives and color morphs of the kribensis: krib, common krib, red krib, super-red krib and rainbow krib, along with rainbow cichlid and purple cichlid.
Hepsetus odoe, the African pike characin, is a predatory freshwater characin belonging to the family Hepsetidae. It was formerly considered that there was a single species of Hepsetus pike characin but recent studies have led to the species being split and Hepsetus odoesensu stricto is the west African representative of the group.
Hepsetus is a genus of African fishes, the African pikes or African pike characins, in the order Characiformes. It is the sole genus in the family Hepsetidae. It was long believed that only a single widespread species existed, H. odoe, but studies in 2011–2013 have shown that this species is restricted to parts of West and Central Africa. The well-known species of southern Africa, including Kafue River, is Hepsetus cuvieri. These predatory fish reach up to 44 cm (17 in) in length.
Hydrocynus is a genus of characin fish in the family Alestidae commonly called "tigerfish," native to Africa. The genus name is derived from Ancient Greek ὕδωρ ("water") + κύων ("dog"). The genus contains five species, all commonly known as "African tigerfish" for their fierce predatory behaviour and other characteristics that make them excellent game fish. Hydrocynus are normally piscivorous, but H. vittatus is proven to prey on birds in flight.
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.
Cichla temensis, the speckled pavon, painted pavon, royal pavon, speckled peacock bass, three-barred peacock bass, or striped tucunare, is a very large South American cichlid. Reaching nearly 1 m (3.3 ft) in length, it is the largest cichlid of the Americas, and one of the largest extant cichlids in the world. It is an important predator in its native waterways, as well as a prized food fish and game fish, which has led to a number of attempted introductions outside of its native range.
Hydrocynus goliath, also known as the goliath tigerfish, giant tigerfish, or mbenga, is a very large African predatory freshwater fish of the family Alestidae.
Ctenopoma multispine, known as the many-spined ctenopoma or climbing perch, is an African freshwater fish. It is up to 14 cm (5.5 in) long and occurs in the Lufira River, Lualaba River, Upemba River, Luapula-Moero in the Democratic Republic of the Congo, Upper Zambezi in Zambia and Okavango River-Lake Ngami in Angola and Botswana. It is also known from the Kafue, rivers of coastal Mozambique, Cuanza River in Angola, and southern tributaries of the Congo River system.
Hydrocynus vittatus, the African tigerfish, tiervis or ngwesh is a predatory freshwater fish distributed throughout much of Africa. This fish is generally a piscivore but it has been observed leaping out of the water and catching barn swallows in flight.
The Okavango mud turtle or Okavango terrapin) is a species of turtle in the family Pelomedusidae endemic to Africa. It is found in Angola, Botswana, the Democratic Republic of the Congo, Namibia (Caprivi), Zambia, and Zimbabwe.
Pseudocrenilabrus philander or the southern mouth-brooder is a small species of haplochromine cichlid found in southern and central Africa. It was first described by the German-Dutch zoologist Max Carl Wilhelm Weber in 1897.
Hydrocynus forskahlii, the elongate tigerfish, is a species of predatory characin from the family Alestidae which is found in northern and western Africa.
Zambezi bream, also known as dwarf bream, is a species of haplochromine cichlid which is found in river systems in southern Africa.
Boulengerella cuiveri, commonly known as the bicuda, is a species of pike-characin in the family Ctenoluciidae.