|Scientific Name:||Gnathonemus petersii|
|Species Authority:||(Günther, 1862)|
Gnathonemus brevicaudatus Pellegrin, 1919
Gnathonemus histrio Fowler, 1936
Gnathonemus petersi (Günther, 1862)
Mormyrus petersii Günther, 1862
|Taxonomic Notes:||This species is probably heterospecific and further study is required.|
|Red List Category & Criteria:||Least Concern ver 3.1|
|Assessor/s:||Awaïss, A., Lalèyè, P. & Moelants, T.|
|Reviewer/s:||Snoeks, J., Tweddle, D., Getahun, A., Lalèyè, P., Paugy, D., Zaiss, R., Fishar, M.R.A & Brooks, E.|
This species has a wide distribution, with no known major widespread threats. It is therefore listed as Least Concern. It has also been assessed regionally as Least Concern for central and western Africa.
|Range Description:||This species is known from Nigeria to Central African Republic, and south to Angola and Zambia
Central Africa: Gnathonemus petersii is known from throughout the Congo River basin. In the Lower Guinea region, it is known from the Cross Mungo, Wouri, Lokoundjé, and Lower Sanaga Rivers.
Western Africa: It is found in the Lower Niger, Ogun, Cross basin and This species is known from upper Chari basin.
Native:Angola (Angola, Angola); Cameroon; Central African Republic; Congo; Congo, The Democratic Republic of the; Nigeria; Zambia
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||No information available.|
|Habitat and Ecology:||Gnathonemus petersii is a demersal species that occurs close to the bottom where it probes for food with the long snout. Territorial and usually aggressive towards members of its own species. This behaviour has been shown to involve electric organ discharge (EOD) activity (Møller 1995). Feeds mostly at night on worms and insects (Mills and Vevers 1989), probably aided by electro-sensory inputs (Møller 1995). The electroreceptors are distributed over the entire head, the dorsal and ventral regions of the body, but absent from the side and the caudal peduncle where the electric organ is located (Møller 1995). Sex-related EOD characteristics in this species has been demonstrated in the laboratory with freshly imported samples during the breeding season; such EOD dimorphism changed with time in captivity (Landsman 1993, 1995). Lead nitrate in water significantly increased EOD rate and selectively altered the EOD waveform of this species (Prabhakar and Landsman 1994). Dubbed a `hearing specialist' having auditory abilities in the range of 100-2500 Hz, with `best frequencies' between 300 and 600 Hz (McCormick and Popper 1984).|
|Major Threat(s):||None known.|
|Conservation Actions:||None known. The taxonomy needs revision.|
Pan-Africa freshwater assessment references. Currently, full citations for references used in the Pan-Africa biodiversity assessments are unavailable on the Red List web site. These will be added to the site in 2011. We apologise for any inconvenience this causes.
IUCN. 2010. IUCN Red List of Threatened Species (ver. 2010.3). Available at: http://www.iucnredlist.org. (Accessed: 2 September 2010).
|Citation:||Awaïss, A., Lalèyè, P. & Moelants, T. 2010. Gnathonemus petersii. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 12 December 2013.|