Striped Nothobranch

Striped Nothobranch
Striped Nothobranch
Conservation status
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Superclass: Osteichthyes
Class: Actinopterygii
Subclass: Neopterygii
Infraclass: Teleostei
Superorder: Acanthopterygii
Order: Cyprinodontiformes
Suborder: Aplocheiloidei
Family: Nothobranchiidae
Genus: Nothobranchius
Species: N. taeniopygus
Binomial name
Nothobranchius taeniopygus
(Hilgendorf, 1891)

The Striped Nothobranch (Nothobranchius taeniopygus) is a ray-finned fish species in the family Nothobranchiidae. Its family was formerly included in the Aplocheilidae, but it is not as closely related to Aplocheilus as was long believed.[1]

The IUCN Red List lists Astatotilapia stappersii as its junior synonym, but this is a lapsus; apart from both being East African Acanthopterygii, the nothobranch ist neither similar nor closely related to the cichlid A. stappersii, which the IUCN in fact features in a separate entry under its old name Haplochromis stappersii.[2]

Its maximum recorded total length is 5.5 cm (2.2 in). Males are readily recognised by their bold blackish scale rims, and anal and caudal fins which have a black margin ith a lighter band below; such a colour pattern is not found in other Nothobranchius. Females are nondescript and resemble those of congeners. The anal and dorsal fins of the Striped Nothobranch have no spines, but, respectively, 16-18 and 11-17 soft rays.[3]

Range and ecology

N. taeniopygus is found in central Tanzania and southern Uganda, and perhaps southwestern Kenya. It has been introduced to other places in its native countries, and probably also Zambia. Earlier it was believed to occur in Burundi also, but this is at least doubtful. This killifish's native range are the drainage basins of Lake Kyoga and Victoria, and the Aswa, Bubu and Malagarasi River.[1]

Its natural habitats are rivers, swamps, freshwater lakes and marshes, temporary pools, floodplains and inland deltas. It can inhabit fairly cool (for its tropical range) water, with a temperature of 18–24 °C (64–75 °F), but of course it must be very eurythermic as the small pools and puddles it usually inhabits will heat up rapidly during the day and cool down just as rapidly in the night. The pH in its habitat has been measured at 8.2 (somewhat alkaline) and the water hardness at 6° dH (rather soft), but this may not be indicative of its preferences and tolerance as very little data exists. A small carnivore, it feeds on aquatic invertebrates, mainly insect larvae and crustaceans. Like its relatives it is semelparous and spawns in the dry season. The eggs are deposited in the substrate, and the parents then die, as the small waterbodies which they inhabit would mostly dry up anyway. The eggs are adapted to surviving the drying-up in diapause, and can even be entirely outside the water for a time, as long as the substrate is still moist. They hatch after 3–5 months.[1]

It is not considered a threatened species by the IUCN. Locally, populations may disappear after habitat destruction and water pollution by agriculture. On the other hand, it is very widespread and resilient, and to some degree used for mosquito control in and around its native range. It is sometimes found as an aquarium fish, but unlike some other Nothobranchius, it is difficult to keep as its requirements are still insufficiently known. [1]

Footnotes

  1. ^ a b c d Natakimazi & Hanssens (2006), FishBase [2009b]
  2. ^ Hanssens et al. (2006), Natakimazi & Hanssens (2006), FishBase [2009a,b]
  3. ^ FishBase [2009b]

References


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