Paramormyrops hopkinsi (Taverne & Thys van den Audenaerde, 1985)

Onglets principaux

EOL Text

Size:

to 156 mm SL.

Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorSullivan, John P., Sullivan, John P., Hopkins, Carl D., Africhthy
Sourcehttp://mormyrids.lifedesks.org/pages/2029

A slender, laterally compressed body (Ref. 81635). Dorsal profile of the head is downward sloping and concave or straight; snout is V-shaped from above (Ref. 81635). Both anal and dorsal fins terminate at about the same level (Ref. 81635). The fish is dark chocolate-brown overall, lighter on the belly; the fins are dark brown (Ref. 81635).

Licensehttp://creativecommons.org/licenses/by-nc/3.0/
Rights holder/AuthorGert Boden, FishBase
Sourcehttp://www.fishbase.org/summary/SpeciesSummary.php?id=51274

Habitat and Ecology:

Habitat and Ecology

This is a benthopelagic species.

Systems

  • Freshwater
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/181703

Environment:

benthopelagic; freshwater

Licensehttp://creativecommons.org/licenses/by-nc/3.0/
Rights holder/AuthorArmi G. Torres, FishBase
Sourcehttp://www.fishbase.org/summary/SpeciesSummary.php?id=51274

Electric Organ Discharge:

A large, head-positive peak, P1, which reaches about 75% of the peak to peak height, is followed by a small head-negative peak, P2, which is only 25% of the peak-peak height. Following P2, the voltage trace returns toward baseline, but then with a delay of three to six msec shows another characteristic head-negative peak. Female EODs tend to be shorter than males but the overall waveform is the same. The average duration of EOD pulses is 4.32 msec for all fish tested. The power spectrum of the EOD peaks at 0 Hz (i.e. D.C.) as expected for pulses that are predominantly monophasic. The electric organ has electrocytes with non-penetrating stalks innervated on the posterior surface. A second variant EOD has been observed in populations of P. hopkinsi from the Ivindo River.

Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorSullivan, John P., Sullivan, John P., Hopkins, Carl D., Africhthy
Sourcehttp://mormyrids.lifedesks.org/pages/2029

IUCN Red List Assessment:
Red List Category

VU
Vulnerable

Red List Criteria

B2ab(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 Ntem population is threatened by a planned deep river port and iron mine with the associated infrastructure. The population on the Lower Ivindo is threatened by iron mining. The AOO is estimated less than 2,000 km. The species is currently only known from three 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/181703

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/181703

Threats:

Major Threats

The Ntem population is threatened by a planned deep river port and iron mine with the associated infrastructure. The population on the Lower Ivindo is threatened by iron mining.
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/181703

Vulnerable (VU) (B2ab(iii))

Licensehttp://creativecommons.org/licenses/by-nc/3.0/
Rights holder/AuthorArmi G. Torres, FishBase
Sourcehttp://www.fishbase.org/summary/SpeciesSummary.php?id=51274

General Description:

A medium-sized Paramormyrops with a slender, laterally compressed body and a narrow, distinctly V-shaped snout when viewed from above the head. Body depth 17.9–21.2% SL. Head length 25–32% SL; snout length 6.0–7.1% SL. Mouth subterminal. Both anal and dorsal fins terminate at about the same level. Dorsal, 17–19 rays; anal, 24–26 rays. Teeth: seven in upper jaw, eight (rarely nine) in lower. Lateral line scales 53–58 total. The angle subtended by the head width measured at the opercular bone to the tip of the snout, is 18–21°. The angle subtended by the snout, measured between the eyes to the tip of the snout, is 34-44°. The dorsal profile of the head is downward sloping and concave or straight.

The fish is dark chocolate-brown overall, lighter on the belly. The fins are dark brown.

Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorSullivan, John P., Sullivan, John P., Hopkins, C.D., Africhthy
Sourcehttp://mormyrids.lifedesks.org/pages/2029
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith