Overview

Comprehensive Description

Biology

Amphidromous freshwater species (Ref. 92840). Occur usually in fresh waters, but occasionally encountered in brackish waters of intermittent streams during dry seasons. Also found in flooded fields and marginal swamps along courses of streams and rivers.
  • Miller, P.J. 1990 Gobiidae. p. 925-951. In J.C. Quero, J.C. Hureau, C. Karrer, A. Post and L. Saldanha (eds.) Check-list of the fishes of the eastern tropical Atlantic (CLOFETA). JNICT, Lisbon, SEI, Paris; and UNESCO, Paris. Vol. 2. (Ref. 5299)
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Distribution

Eastern Atlantic: St. Louis, Senegal to the Cunene River, Angola and from the islands of Gulf of Guinea. Reported from the East Coast drainage of Africa (Ref. 4967).
  • Miller, P.J. 1990 Gobiidae. p. 925-951. In J.C. Quero, J.C. Hureau, C. Karrer, A. Post and L. Saldanha (eds.) Check-list of the fishes of the eastern tropical Atlantic (CLOFETA). JNICT, Lisbon, SEI, Paris; and UNESCO, Paris. Vol. 2. (Ref. 5299)
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Western Africa: Senegal to Angola.
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Physical Description

Morphology

Dorsal spines (total): 7; Dorsal soft rays (total): 10 - 11; Analspines: 1; Analsoft rays: 9 - 10
  • Eccles, D.H. 1992 FAO species identification sheets for fishery purposes. Field guide to the freshwater fishes of Tanzania. Prepared and published with the support of the United Nations Development Programme (project URT/87/016). FAO, Rome. 145 p. (Ref. 4967)
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Size

Maximum size: 264 mm TL
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Max. size

26.4 cm TL (male/unsexed; (Ref. 4343))
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Diagnostic Description

Upper jaw slightly hangs over lower jaw. Upper lip thick. Head broader than deep. Caudal fin rounded.
  • Eccles, D.H. 1992 FAO species identification sheets for fishery purposes. Field guide to the freshwater fishes of Tanzania. Prepared and published with the support of the United Nations Development Programme (project URT/87/016). FAO, Rome. 145 p. (Ref. 4967)
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Ecology

Habitat

Kunene River Demersal Habitat

This taxon is one of a number of demersal species in the Kunene River system. Demersal river fish are found at the river bottom, feeding on benthos and zooplankton

The Kunene River rises in the central highlands of Angola, and thence flows southward to form a major element of the border between Namibia and Angola before the final discharge is to the Atlantic Ocean in the vicinity of the Angola-Benguela Front. The geometry of the Kunene riparian zone is distinctly narrow, with rugged arid landscapes persisting on both sides of the river over long distances, and a virtual lack of any extensive floodplains.

There is a relatively high rate of endemism of aquatic biota in the Kunene. Proposed expansion of dams on the Kunene poses a threat to biodiversity in the river, especially regarding proposals at Epupa Falls. However, a greater threat to the Kunene is a plan by Angola to greatly expand withdrawal of water from the river to expand irrigated agriculture by 600,000 hectares; not only will this action significantly diminish downriver flow rates, but also add considerable nitrate, herbicide and pesticide substances to the river.

The catchment area of the Kunene Basin is approximately 106,560 square kilometres (41,143 square miles) in area, of which 14 100 km² (13%) lies within Namibian territory. Its mean annual discharge is 174 cubic meters per second (6145 cubic feet per second) at its mouth on the Atlantic. Water quality of the Kunene River is relatively high, since the human population density and agricultural intensity is relatively low, including a conspicuous absence of overgrazing. However, bacteria and other microbial pathogens pose a material threat to Kunene water quality, due to the fact that only a small fraction of the domestic wastewater in Angola is treated;

Regarding freshwater bivalves, the central reaches of the Kunene manifest particularly high endemism, similar to parts of the Okavango, Chobe, Upper Zambezi and Etosha Pan basins. The bivalve Etheria elliptica, which also occurs in the Upper Zambezi, is a freshwater mussel in the family Etheriidae, known from a limited extent of the central Kunene River in Angola. It is threatened by proposed dam construction on the Kunene.

There are two endemic denmersal fish in the Kunene: the 26 centimeter (cm) long demersal Kunene happy (Sargochromis coulteri) and the demersal fish Hippopotamyrus longilateralis.

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Environment

demersal; amphidromous (Ref. 46888); freshwater; brackish; marine
  • McDowall, R.M. 1997 The evolution of diadromy in fishes (revisited) and its place in phylogenetic analysis. Rev. Fish Biol. Fish. 7(4):443-462. (Ref. 46888)
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Depth range based on 19 specimens in 1 taxon.
Water temperature and chemistry ranges based on 19 samples.

Environmental ranges
  Depth range (m): 0.065 - 7.6
  Temperature range (°C): 26.890 - 27.075
  Nitrate (umol/L): 0.395 - 0.448
  Salinity (PPS): 33.056 - 33.581
  Oxygen (ml/l): 4.652 - 4.679
  Phosphate (umol/l): 0.149 - 0.176
  Silicate (umol/l): 1.821 - 3.414

Graphical representation

Depth range (m): 0.065 - 7.6

Temperature range (°C): 26.890 - 27.075

Nitrate (umol/L): 0.395 - 0.448

Salinity (PPS): 33.056 - 33.581

Oxygen (ml/l): 4.652 - 4.679

Phosphate (umol/l): 0.149 - 0.176

Silicate (umol/l): 1.821 - 3.414
 
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Migration

Amphidromous. Refers to fishes that regularly migrate between freshwater and the sea (in both directions), but not for the purpose of breeding, as in anadromous and catadromous species. Sub-division of diadromous. Migrations should be cyclical and predictable and cover more than 100 km.Characteristic elements in amphidromy are: reproduction in fresh water, passage to sea by newly hatched larvae, a period of feeding and growing at sea usually a few months long, return to fresh water of well-grown juveniles, a further period of feeding and growing in fresh water, followed by reproduction there (Ref. 82692).
  • McDowall, R.M. 1997 The evolution of diadromy in fishes (revisited) and its place in phylogenetic analysis. Rev. Fish Biol. Fish. 7(4):443-462. (Ref. 46888)
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Trophic Strategy

Occurs usually in freshwaters, but occasionally encountered in brackish waters of intermittent streams during dry seasons. Also found in flooded fields and marginal swamps along courses of streams and rivers.
  • Hay, C.J., B.J. van Zyl, F.H. van der Bank, J.T. Ferreira and G.J. Steyn 1999 The distribution of freshwater fish in Namibia. Cimbebasia 15:41-63. (Ref. 33857)
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Conservation

Threats

Not Evaluated
  • IUCN 2006 2006 IUCN red list of threatened species. www.iucnredlist.org. Downloaded July 2006.
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Wikipedia

Awaous lateristriga

Awaous lateristriga, the West African freshwater goby, is a species of goby found in marine, fresh and brackish waters (though mostly in freshwaters) along the Atlantic coast of Africa from Senegal to the Cunene River, Angola and also from islands in the Gulf of Guinea. This species can reach a length of 26.4 centimetres (10.4 in) TL.[1]

References[edit]

  1. ^ Froese, Rainer and Pauly, Daniel, eds. (2013). "Awaous lateristriga" in FishBase. April 2013 version.
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