Marcusenius sanagaensis Boden, Teugels & Hopkins, 1997

Onglets principaux

EOL Text

Environment:

demersal; freshwater

Licensehttp://creativecommons.org/licenses/by-nc/3.0/
Rights holder/AuthorArmi G. Torres, FishBase
Sourcehttp://www.fishbase.org/summary/SpeciesSummary.php?id=50320

Electric Organ Discharge:

Unknown.

Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorSullivan, John P., Sullivan, John P., Africhthy
Sourcehttp://mormyrids.lifedesks.org/pages/2132

IUCN Red List Assessment:
Red List Category

VU
Vulnerable

Red List Criteria

B1ab(iii)+2ab(iii)

Version

3.1

Year Assessed

2010

Assessor/s

Moelants, T.

Reviewer/s

Brummett, R., Mbe Tawe, A.N., Dening Touokong, C., Reid, G.M., Snoeks, J. Staissny, M., Moelants, T., Mamonekene, V., Ndodet, B., Ifuta, S.N.B., Chilala, A., Monsembula, R., Ibala Zamba, A., Opoye Itoua, O., Pouomogne, V., Darwall, W. & Smith, K.

Contributor/s

Justification

The most western part of the species distribution is declining in quality due to urbanisation and to the very intensive agricultural farming, leading to pollution from pesticides and sedimentation. It also is threatened by sedimentation from slash and burn agriculture and commercial logging in the Mbam River. Both the EOO and AOO qualify for the Vulnerable status and the species is known from fewer than 10 localities.
Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorInternational Union for Conservation of Nature and Natural Resources
Sourcehttp://www.iucnredlist.org/apps/redlist/details/182215

Population:

Population

No information available.

Population Trend

Unknown
Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorInternational Union for Conservation of Nature and Natural Resources
Sourcehttp://www.iucnredlist.org/apps/redlist/details/182215

Biology:

Found in raceways with sandy bottoms of larger rivers (50-200 m), in the tree savannah and the more or less degraded semi-tropical forest.

Licensehttp://creativecommons.org/licenses/by-nc/3.0/
Rights holder/AuthorArmi G. Torres, FishBase
Sourcehttp://www.fishbase.org/summary/SpeciesSummary.php?id=50320

Threats:

Major Threats

The most western part of the species distribution is declining in quality due to urbanisation and to the very intensive agricultural farming, leading to pollution from pesticides and sedimentation. It also is threatened by sedimentation from slash and burn agriculture and commercial logging in the Mbam River.
Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorInternational Union for Conservation of Nature and Natural Resources
Sourcehttp://www.iucnredlist.org/apps/redlist/details/182215

General Description:

Marcusenius sanagaensis has eight circumpeduncular scales, 49-56 lateral line scales (median 52), 24-28 dorsal rays (median 25), 29-33 anal fin rays (median 31), and a dark vertical band between dorsal and anal fins covered by 3-4 scales. Depth of body 26.2-28.9% SL; length of head 22-24% SL, head 1.11 times as long as deep. Snout blunt, 28% HL. Mouth terminal. Teeth bicuspid, five in upper jaw, six in lower. Fleshy submental appendage, round and forward-projecting. Eye small, 18% HL. Dorsal fin length, 22-24.5% SL with 24-28 rays; anal fin length 26-29.2% SL, with 29-33 rays. Dorsal originates slightly posterior to origin of anal, vertically aligned with 3rd-5th anal ray. Pre-anal distance is 93.7% of pre-dorsal distance. Caudal peduncle length 17.6% SL; 2.9 times as long as high. Caudal fin small with obtusely pointed lobes; 49-56 scales in the lateral line, eight circumpeduncular scales.

Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorSullivan, John P., Hopkins, Carl D., Africhthy
Sourcehttp://mormyrids.lifedesks.org/pages/2132

Vulnerable (VU) (B1ab(iii)+2ab(iii))

Licensehttp://creativecommons.org/licenses/by-nc/3.0/
Rights holder/AuthorArmi G. Torres, FishBase
Sourcehttp://www.fishbase.org/summary/SpeciesSummary.php?id=50320

Range Description:

A Lower Guinea endemic, restricted to the Sanaga River basin in Cameroon where it has been reported from the main river channel near Nanga-Eboko, Nachtigal, and from the Mbam and its tributaries.

Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorInternational Union for Conservation of Nature and Natural Resources
Sourcehttp://www.iucnredlist.org/apps/redlist/details/182215

Conservation Actions:

Conservation Actions

None known.
Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorInternational Union for Conservation of Nature and Natural Resources
Sourcehttp://www.iucnredlist.org/apps/redlist/details/182215
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith