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 odoe 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 Greekhepsētós, 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 characidOligosarcus hepsetus. The specific nameodoe is the local name for this species in Guinea, which appears to refer to its manu teeth.[9]
Hepsetus odoe is an elongated fish with a pike-like body, however this species is a characin and the pike resemblance is due to convergent evolution. This species can reach up to about 28 cm (11 in) in length.[2] The back is normally dark brown or green while the belly is silver. The head is normally light green or brown with distinct dark brown or black stripes radiating out from the eye. The colour and pattern of adult fish is relatively stable but juveniles are more variable.[10]
Hepsetus odoe prefers quiet and deep water, and may only live about five years. Spawning normally begins in August and continues until January. Although in some locations there is an extended spawning season which lasts until May. The eggs are laid in a bubble nest, which they then guard until the young have attached themselves to the bottom of the nest, at which stage the adults abandon the nest and their young. The nest breaks up about four days afterwards and the juveniles disperse to live in well-vegetated marginal habitats.[10]
Hepsetus odoeispiscivorous and preys on a variety of smaller fish. It is mainly diurnal and is an ambush predator, waiting among dense submerged or emergent vegetation until prey comes within range and the fish can lunge at it. The diet of Hepsetus odoe consists predominantly of cichlids and mormyrids; although smaller individuals have been recorded eating mochokidcatfishes more than cichlids or mormyrids.[10]Hepsetus odoe prefers the upper courses of small rivers where the elongate tigerfish (Hydrocynus forskahlii) is absent or less abundant.[1] It uses weeds and vegetation along with its coloring to avoid detection.[10]
^Decru, E.; Vreven, E. & Snoeks, J. (2013). "A revision of the Lower Guinean Hepsetus species (Characiformes; Hepsetidae) with the description of Hepsetus kingsleyae sp. nov". Journal of Fish Biology. 82 (4): 1351–1375. doi:10.1111/jfb.12079. PMID23557311.
^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.
^Decru, E.; Vreven, E. & Snoeks, J. (January 2012). "A revision of the West African Hepsetus (Characiformes: Hepsetidae) with a description of Hepsetus akawo sp. nov. and a redescription of Hepsetus odoe (Bloch, 1794)". Journal of Natural History. 46 (1–2): 1–23. doi:10.1080/00222933.2011.622055.
