Overview

Comprehensive Description

Biology

Occurs in temporary pools and swamps in the drainage systems of coastal rivers (Ref. 3788). Bottom spawner, 4-6 months incubation. Is very difficult to maintain in aquarium (Ref. 27139).
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Distribution

Range Description

Lower Zambezi floodplains, central Mozambique south to the Kruger Park region of South Africa.
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Africa: Mozambique and South Africa, marshes on the coastal plain near Beira and pans in the Kruger National Park (Ref. 7248).
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Mozambique and southeastern Africa.
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Physical Description

Size

Maximum size: 60 mm TL
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Max. size

6.0 cm TL (male/unsexed; (Ref. 27139))
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Ecology

Habitat

Zambezi River Benthopelagic Habitat

This taxon is one of a number of benthopelagic species in the Zambezi River system of southern Africa. Benthopelagic river fish are found near the bottom of the water column, feeding on benthos and zooplankton

Nutrient levels in the Zambezi River are relatively low, especially in the upper Zambezi; in that reach, above Victoria Falls, most of the catchment drains Kalahari sands, whose nutrient levels are inherently low due to their aeolian formation; moreover, agricultural fertilizer addition throughout the Zambezi watershed is low, due to the shortage of capital available to farmers of this region.

Nitrate levels (as nitrogen) in the upper Zambezi are typically in the range of .01 to .03 milligrams per liter. Correspondingly electrical conductivity of the upper Zambezi is on the order of 75 micro-S per centimeter, due to the paucity of ion content. From the Luangwa River downstream nitrate levels elevate to .10 to .18 milligrams per liter, and electrical conductivity rises to a range of two to four times the upper Zambezi levels. Not surprisingly, pH, calcium ion concentration, bicarbonate and electrical conductivity are all higher in portions of the catchment where limestone soils predominate compared to granite.

There are a total of 190 known fish species present in the Zambezi River, including eel and shark taxa. The largest native benthopelagic fish in the Zambezi are the 170 cm North African catfish (Clarias gariepinus), the 146 cm common carp (Cyprinus carpio carpio), the 150 cm Indo-Pacific tarpon (Megalops cyprinoides) and the introduced 120 cm rainbow trout (Oncorhynchus mykiss).

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Habitat and Ecology

Habitat and Ecology
Seasonal pans and swamps in riverine floodplains.

Systems
  • Freshwater
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Environment

benthopelagic; non-migratory; freshwater; pH range: 6.0 - 7.0; dH range: 4 - 6
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Diseases and Parasites

Costia Disease. Parasitic infestations (protozoa, worms, etc.)
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Bacterial Infections (general). Bacterial diseases
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Life History and Behavior

Life Cycle

Annual fish. Matures after 12 weeks. This updates previous information from Ref. 1672.
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Life Expectancy

Lifespan, longevity, and ageing

Maximum longevity: 0.8 years (captivity) Observations: Record longevity in captivity is less than one year (Herrera and Jagadeeswaran 2004).
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2007

Assessor/s
Bills, R.

Reviewer/s
Snoeks, J. (Freshwater Fish Red List Authority) & Darwall, W. (Freshwater Biodiversity Assessment Unit)

Contributor/s

Justification
As for N. orthonotus, this species is widespread and common over a wide region in Mozambique. Habitats are abundant. Localized impacts are known from the southern range for the species where it may be locally rare and threatened.
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Population

Population Trend
Unknown
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Threats

Major Threats
Damage to pans by road builders has occurred and impacts from insecticide spraying has also occurred. Presently, there don't appear to be major impacts.
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Least Concern (LC)
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Relevance to Humans and Ecosystems

Benefits

Importance

aquarium: commercial
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Wikipedia

Nothobranchius rachovii

Introduction[edit source | edit]

Nothobranchius rachovii, or the bluefin notho, (Ahl, 1926) is a species of freshwater annual killifish from Mozambique and South Africa.[1] It can grow up to 6 cm (2.4").[2] It is popular among killifish enthusiasts, who raise them from eggs in aquaria.

Variants[edit source | edit]

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,[3] and Nothobranchius rachovii var. Red, which has a red head with turquoise highlights.[4] The females of all varieties are more neutrally colored.

In the Aquarium[edit source | edit]

Nothobranchius rachovii can be housed in a 40–60 litre (10–15 gallons) aquarium. Males are aggressive toward other males of the same species.[5] They can be kept in a community tank of similar-sized peaceful freshwater tropical fish.

References[edit source | edit]

  1. ^ a b Froese, Rainer and Pauly, Daniel, eds. (2010). "Nothobranchius rachovii" in FishBase. October 2010 version.
  2. ^ Mongabay – Rainbow Nothobranch. Accessed 23 January 2010.
  3. ^ Killitalk – 5 July 1998 Accessed 23 January 2010.
  4. ^ Mongabay – Rainbow Nothobranch. Accessed 23 January 2010.
  5. ^ Mongabay – Rainbow Nothobranch. Accessed 23 January 2010.
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