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Gnathonemus longibarbis

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA ACTINOPTERYGII OSTEOGLOSSIFORMES MORMYRIDAE

Scientific Name: Gnathonemus longibarbis
Species Authority: (Hilgendorf, 1888)
Common Name(s):
English Longnose Stonebasher

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2006
Date Assessed: 2006-01-31
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.

Geographic Range [top]

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).
Countries:
Native:
Burundi; Congo, The Democratic Republic of the; Kenya; Tanzania, United Republic of
Range Map: Click here to open the map viewer and explore range.

Population [top]

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

Habitat and Ecology [top]

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

Threats [top]

Major Threat(s): Competitive displacement by introduced fishes. The species has become rare since the introduction of Lates niloticus.

Conservation Actions [top]

Conservation Actions: None known.

Citation: Ntakimazi, G. 2006. Gnathonemus longibarbis. The IUCN Red List of Threatened Species. Version 2014.3. <www.iucnredlist.org>. Downloaded on 23 November 2014.
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