Gnathonemus longibarbis

Taxonomy

Assessment Information

Geographic Range

Population

Habitat and Ecology

Threats

Conservation Actions

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 Assessed:	2006
Assessor/s	Ntakimazi, G.
Evaluator/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

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

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.

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.

Conservation Actions:

None known.

Citation:	Ntakimazi, G. 2006. Gnathonemus longibarbis. In: IUCN 2008. 2008 IUCN Red List of Threatened Species. <www.iucnredlist.org>. Downloaded on 22 November 2008.
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