Overview

Comprehensive Description

Biology

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).
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Distribution

Range Description

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

Maximum size: 360 mm SL
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Max. size

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

Habitat

Habitat and Ecology

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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Environment

demersal; potamodromous (Ref. 10608); freshwater; depth range 27 - 45 m (Ref. 9606)
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Depth: 27 - 45m.
From 27 to 45 meters.

Habitat: demersal.
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Migration

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

Molecular Biology

Statistics of barcoding coverage: Gnathonemus longibarbis

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


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)

Contributor/s

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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Population

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

Major Threats
Competitive displacement by introduced fishes. The species has become rare since the introduction of Lates niloticus.
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Least Concern (LC)
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Management

Conservation Actions

Conservation Actions
None known.
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Relevance to Humans and Ecosystems

Benefits

Importance

fisheries: of no interest
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Wikipedia

Longnose stonebasher

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[edit]


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