Gnathonemus longibarbis — Details

Longnose Stonebasher learn more about names for this taxon

Overview

Comprehensive Description

Biology

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Occurs in shallow inshore waters over both sandy and rocky bottoms, appearing seasonally over muddy bottoms adjacent to extensive papyrus swamps. Also found in deep water, near rocky islands. Feeds on large libellulid nymphs and other large prey (Ref. 9606). Oviparous (Ref. 205). Migrates up the river to spawn (Ref. 10608).

Gosse, J.-P. 1984 Mormyridae. p. 63-122. In J. Daget, J.-P. Gosse and D.F.E. Thys van den Audenaerde (eds.) Check-list of the freshwater fishes of Africa (CLOFFA). ORSTOM, Paris and MRAC, Tervuren. Vol. 1. (Ref. 3203) http://www.fishbase.org/references/FBRefSummary.php?id=3203&speccode=10825

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Distribution

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Africa: Lake Victoria, Lake Tanganyika, Victoria Nile (Zambeze?) (Ref. 3203).

Gosse, J.-P. 1984 Mormyridae. p. 63-122. In J. Daget, J.-P. Gosse and D.F.E. Thys van den Audenaerde (eds.) Check-list of the freshwater fishes of Africa (CLOFFA). ORSTOM, Paris and MRAC, Tervuren. Vol. 1. (Ref. 3203) http://www.fishbase.org/references/FBRefSummary.php?id=3203&speccode=10825

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Range Description

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Lake Victoria basin (Seegers et al. unpub.), the Middle and lower Akagera, Kyoga and smaller associated Lakes. Also in Lake Nabugabo and the Victoria Nile (Greenwood 1966). Originally abundant in or near water-lily swamps of Lake Kyoga (Greenwood 1966). Also in Lake Tanganyika (Gosse 1984) and the Malagarasi River (De Vos et al. 2001).

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Eastern Africa: Lake Victoria and Lake Tanganyika basins. See FishBase for museum records and localities.

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Eastern Africa: Lake Victoria and Lake Tanganyika basins.

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Physical Description

Size

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Maximum size: 360 mm SL

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Max. size

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36.0 cm SL (male/unsexed; (Ref. 4967))

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) http://www.fishbase.org/references/FBRefSummary.php?id=4967&speccode=11098

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Ecology

Habitat

Environment

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demersal; potamodromous (Ref. 10608); freshwater; depth range 27 - 45 m (Ref. 9606)

Okedi, J. 1971 The food and feeding habits of the small mormyrid fishes of Lake Victoria, East Africa. Afr. J. Trop. Hydrobiol. Fish. 1(1):1-12. (Ref. 9606) http://www.fishbase.org/references/FBRefSummary.php?id=9606&speccode=4648
Okedi, J. 1969 Observations on the breeding and growth of certain mormyrid fishes of the Lake Victoria Basin. Rev. Zool. Bot. Afr. 79:34-64. (Ref. 10608) http://www.fishbase.org/references/FBRefSummary.php?id=10608&speccode=10861

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Habitat and Ecology

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Habitat and Ecology

Occurs in shallow waters over both sandy and rocky habitats and appearing seasonally over muddy bottoms adjacent to extensive Papyrus swamps. Also found in deep water near rocky islands. Feeds on large libellulid nymphs and other large prey (Okedi 1971) (after Froese and Pauly 2003). Originally common in shallow inshore waters over both sand and rock (Lake Victoria), and in or near water lilies (Lake Kyoga), before introduction of Nile perch and Nile tilapia became fully established in the two lakes. Now rarely encountered. Max. size: 36.0 cm SL.

Systems

Freshwater

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Depth: 27 - 45m.
From 27 to 45 meters.

Habitat: demersal.

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Migration

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Potamodromous. Migrating within streams, migratory in rivers, e.g. Saliminus, Moxostoma, Labeo. Migrations should be cyclical and predictable and cover more than 100 km.

Okedi, J. 1969 Observations on the breeding and growth of certain mormyrid fishes of the Lake Victoria Basin. Rev. Zool. Bot. Afr. 79:34-64. (Ref. 10608) http://www.fishbase.org/references/FBRefSummary.php?id=10608&speccode=10861

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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Gnathonemus longibarbis

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Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 3
Species With Barcodes: 1

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Conservation

Conservation Status

IUCN Red List Assessment

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Red List Category

LC

Least Concern

Red List Criteria

Version

3.1

Year Assessed

2006

Assessor/s

Ntakimazi, G.

Reviewer/s

Snoeks, J. (Freshwater Fish Red List Authority) & Darwall, W. (Freshwater Biodiversity Assessment Programme)

Justification

Widespread in several major lake and river basins. No major widespread threats identified, although the species has suffered a major local decline in Lake Victoria.

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Trends

Population

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Population

Not known, but common in fisheries catches in middle Akagera. Large extent of occurrence but rarely encountered. Nowhere considered common (Greenwood 1966).

Population Trend

Unknown

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Threats

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Least Concern (LC)

IUCN 2006 2006 IUCN red list of threatened species. www.iucnredlist.org. Downloaded July 2006. http://www.fishbase.org/references/FBRefSummary.php?id=57073

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Major Threats

Competitive displacement by introduced fishes. The species has become rare since the introduction of Lates niloticus.

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Management

Conservation Actions

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Conservation Actions

None known.

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Relevance to Humans and Ecosystems

Benefits

Importance

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fisheries: of no interest

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) http://www.fishbase.org/references/FBRefSummary.php?id=4967&speccode=11098

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Wikipedia

Longnose stonebasher

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The longnose stonebasher (Gnathonemus longibarbis) is a species of fish in the Mormyridae family. It is found in Burundi, the Democratic Republic of the Congo, Kenya, and Tanzania. Its natural habitats are rivers, freshwater lakes, freshwater marshes, and inland deltas.

References

Ntakimazi, G. 2005. Gnathonemus longibarbis. 2006 IUCN Red List of Threatened Species. Downloaded on 4 August 2007.

This Osteoglossiformes-related article is a stub. You can help Wikipedia by expanding it.

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