Hepsetus cuvieri

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Hepsetus cuvieri
Hepsetus cuvieri 4.JPG
Hepsetus cuvieri, in an Aquarium of Guma Lagoon Camp in the Okavango Delta
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Characiformes
Family: Hepsetidae
Genus: Hepsetus
Species:
H. cuvieri
Binomial name
Hepsetus cuvieri
(Castelnau, 1861) [2]
Synonyms
  • Hydrocyonoides cuvieriCastelnau, 1861 [3]

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.

Contents

Taxonomy

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]

Etymology

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]

Distribution

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]

Description

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]

Biology

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]

Conservation status

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]

Related Research Articles

<span class="mw-page-title-main">Characiformes</span> Order of fishes

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.

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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.

<span class="mw-page-title-main">African fish eagle</span> Species of bird

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.

<span class="mw-page-title-main">Bubble nest</span> Nest built by some fish and frog species to protect their eggs

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<i>Hepsetus odoe</i> Species of fish

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.

<i>Hepsetus</i> Genus of fishes

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.

<i>Hydrocynus</i> Genus of fishes

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<i>Serranochromis</i> Genus of fishes

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<i>Hydrocynus forskahlii</i> Species of fish

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References

  1. 1 2 Geelhand, D.; Musschoot, T. & Boden, G. (2020). "Hepsetus cuvieri". IUCN Red List of Threatened Species . 2020: e.T55325427A58340539. doi: 10.2305/IUCN.UK.2020-2.RLTS.T55325427A58340539.en . Retrieved 29 April 2024.
  2. 1 2 3 "Hepsetus cuvieri". Fishbase.org. Retrieved 14 August 2016.
  3. "Synonyms of Hepsetus cuvieri (Castelnau, 1861)". fishbase.org. Retrieved 3 October 2016.
  4. Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Species in the genus Hepsetus". Catalog of Fishes . California Academy of Sciences . Retrieved 29 April 2024.
  5. Zengeya, T. A.; Decru, E. & Vreven, E. (2011). "Revalidation of Hepsetus cuvieri (Castelnau, 1861) (Characiformes: Hepsetidae) from the Quanza, Zambezi and southern part of the Congo ichthyofaunal provinces". Journal of Natural History. 45 (27–28): 1723–1744. doi:10.1080/00222933.2011.560724.
  6. Nelson, J.S.; Grande, T.C.; Wilson, M.V.H. (2016). Fishes of the World (5th ed.). Hoboken, NJ: John Wiley & Sons. pp. 196–197. doi:10.1002/9781119174844. ISBN   978-1-118-34233-6. LCCN   2015037522. OCLC   951899884. OL   25909650M.
  7. Christopher Scharpf & Kenneth J. Lazara (22 September 2018). "Order CHARACIFORMES: Families DISTICHODONTIDAE, CITHARINIDAE, CRENUCHIDAE, ALESTIDAE and HEPSETIDAE". The ETYFish Project Fish Name Etymology Database. Christopher Scharpf and Kenneth J. Lazara. Retrieved 5 November 2021.
  8. 1 2 3 "Kafue pike characin". eol.org. Retrieved 13 August 2016.
  9. A Survey of the Fishes of Upper Okavango River System in Angola. Authors: Roger Bills, Paul Skelton and Francisco Almeida. South African Institute for Aquatic Biodiversity (SAIAB) 2012. Investigational Report No. 73.
  10. "Reproduction of Hepsetus cuvieri". Fishbase.de. Retrieved 14 August 2016.
  11. "Hepsetus odoe African Pike Characin". Seriously Fish. Retrieved 14 August 2016.
  12. Mospele, Ketlhatlogile; Moyle, Peter B.; Merron, Glenn S.; Purkey, David R.; Mospele, Belda (2009). "Fish, Floods, and Ecosystem Engineers: Aquatic Conservation in the Okavango Delta, Botswana" (PDF). BioScience. 59 (1): 53–64. doi:10.1525/bio.2009.59.1.9.
  13. Kirk O. Winemiller; Leslie C. Kelso-Winemiller (1994). "Comparative ecology of the African pike, Hepsetus odoe, and tigerfish, Hydrocynus forskahlii, in the Zambezi River floodplain" (PDF). Journal of Fish Biology. 45 (2): 211–225. doi:10.1006/jfbi.1994.1121.