Nothobranchius rachovii
Adult male
Adult female
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Cyprinodontiformes
Family: Nothobranchiidae
Genus: Nothobranchius
Species:
N. rachovii
Binomial name
Nothobranchius rachovii
Ahl, 1926
Synonyms

Adiniops rachovii (Ahl, 1926)[2]

Nothobranchius rachovii, the bluefin notho, is a species of freshwater annual killifish from Mozambique.[2] It can grow up to 6 cm (2.4").[3] It is popular among killifish enthusiasts, who raise them from eggs in aquaria.

Description

Aside from the typical orange and blue variant, there is Nothobranchius rachovii KNP Black, which has much darker colors, and was collected from the wild in Kruger National Park, South Africa in 1984,[4] and Nothobranchius rachovii var. Red, which has a red head with turquoise highlights.[3] The females of all varieties are more neutrally colored. This shows sexual dimorphism among these fish.

Distribution

Nothobranchius rachovii sensu stricto is found in the floodplain of the lower Zambezi and also in the floodplain of the Pungwe River.[2]

Diet

N. rachovii are benthopelagic, feeding on zooplankton and other small organisms living at the bottom of the water (benthos).

Habitat

N. rachovii are naturally found in flat plains or water depressions that dry up annually.[5] Like other benthopelagic fish, N. rachovii prefer to stay at the bottom of the water, right above the benthic zone.[6] They lay their eggs in mud as the water level decreases, which preserves them until the water returns.[7]

Reproduction and life cycle

Bluefin nothos mature in about twelve weeks,[8] live for up to a year or year and a half, then die at the end of the breeding season- which is why they are called “annual” killifish.[9] They are able to have offspring by burying their eggs in the river/ lake bed before their habitat dries up- they live in temporary pools dependent on rainfall. These eggs develop while buried in the mud and then hatch once the pools are refilled with water from rainfall.[10]

In the aquarium

N. rachovii are of commercial importance, being commonly found in the pet trade. They can be housed in a 40–60 litre (10–15 gallons) aquarium. Males are aggressive toward other males of the same species.[3] They can be kept in a community tank of similar-sized peaceful freshwater tropical fish.

Naming

Nothobranchius rachovii was described by Ernst Ahl in 1926 with the type locality given as Beira, Mozambique.[11] The specific name honours the German aquarist Arthur Rachow (1884–1960), who donated a number of fish specimens to the Museum für Naturkunde.[12]

References

Wikimedia Commons has media related to Nothobranchius rachovii.
  1. ↑ Nagy, B.; Watters, B. (2019). "Nothobranchius rachovii". IUCN Red List of Threatened Species. 2019: e.T141973907A58311523. doi:10.2305/IUCN.UK.2019-3.RLTS.T141973907A58311523.en. Retrieved 19 November 2021.
  2. 1 2 3 Froese, Rainer; Pauly, Daniel (eds.) (2010). "Nothobranchius rachovii" in FishBase. October 2010 version.
  3. 1 2 3 Mongabay – Rainbow Nothobranch. Accessed 23 January 2010.
  4. ↑ Killitalk – 5 July 1998 Accessed 23 January 2010.
  5. ↑ "Nothobranchius rachovii (Bluefin Nothobranch)". Seriously Fish. Retrieved 2017-03-31.
  6. ↑ Mauchline J and Gordon JDM (1986) "Foraging strategies of deep-sea fish"] Mar. Ecol. Prog. Ser. 27: 227–238. Download
  7. ↑ "The Genus Nothobranchius | American Killifish Association". aka.org. Retrieved 2017-03-31.
  8. ↑ "Nothobranchius rachovii summary page". FishBase. Retrieved 2017-03-31.
  9. ↑ "Rachow's Nothobranch – Killifish". www.aboutfishonline.com. Retrieved 2017-03-31.
  10. ↑ "Killifish – Nothos Killifish". www.fishlore.com. Retrieved 2017-03-31.
  11. ↑ Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Nothobranchius rachovi". Catalog of Fishes. California Academy of Sciences. Retrieved 8 September 2019.
  12. ↑ Christopher Scharpf; Kenneth J. Lazara (31 May 2019). "Order CYPRINODONTIFORMES: Families APLOCHEILIDAE and NOTHOBRANCHIIDAE". The ETYFish Project Fish Name Etymology Database. Christopher Scharpf and Kenneth J. Lazara. Retrieved 8 September 2019.


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