Marcusenius victoriae (Worthington, 1929)

Onglets principaux

EOL Text

Habitat and Ecology:

Habitat and Ecology

Found in shallow inshore waters near river mouths on both soft and rocky bottoms, in or near marginal plants. Originally abundant near water lily swamps in Lake Kyoga. Feeds on aquatic insect larvae (especially Chironomidae, Polymitrarcidae and Odonata), crustaceans, gastropods, fish eggs and detritus (Okedi 1971).

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/60365

Environment:

demersal; potamodromous (Ref. 10608); freshwater

Licensehttp://creativecommons.org/licenses/by-nc/3.0/
Rights holder/AuthorPascualita Sa-a, FishBase
Sourcehttp://www.fishbase.org/summary/SpeciesSummary.php?id=10919

Potamodromous. Migrating within streams, migratory in rivers, e.g. Saliminus, Moxostoma, Labeo. Migrations should be cyclical and predictable and cover more than 100 km.

Licensehttp://creativecommons.org/licenses/by-nc/3.0/
Rights holder/AuthorPascualita Sa-a, FishBase
Sourcehttp://www.fishbase.org/summary/SpeciesSummary.php?id=10919

Occurs in shallow inshore waters over both sandy and rocky bottoms, appears seasonally over muddy bottoms adjacent to extensive papyrus swamps. Feeds on small organisms like Ostracoda, Hydracarina, and Diaptomus.

Licensehttp://creativecommons.org/licenses/by-nc/3.0/
Rights holder/AuthorDrina Sta. Iglesia, FishBase
SourceNo source database.

Spinitectus Infestation 5 (Larvae sp.). Parasitic infestations (protozoa, worms, etc.)

Licensehttp://creativecommons.org/licenses/by-nc/3.0/
Rights holder/AuthorAllan Palacio, FishBase
Sourcehttp://www.fishbase.org/Diseases/diseasesList.cfm?ID=10919&StockCode=11243

Rhabdochona Disease. Parasitic infestations (protozoa, worms, etc.)

Licensehttp://creativecommons.org/licenses/by-nc/3.0/
Rights holder/AuthorAllan Palacio, FishBase
Sourcehttp://www.fishbase.org/Diseases/diseasesList.cfm?ID=10919&StockCode=11243

IUCN Red List Assessment:
Red List Category

EN
Endangered

Red List Criteria

A2bcde

Version

3.1

Year Assessed

2006

Assessor/s

Bayona, J.D.R., Twongo, T.K. & Kazembe, J.

Reviewer/s

Snoeks, J. (Freshwater Fish Red List Authority) & Darwall, W. (Freshwater Biodiversity Assessment Programme)

Contributor/s

Justification

A population decline of more than 50% has been recoded within the last 10 years due to the combined impacts of fisheries exploitation, loss of habitat, and reduction in habitat quality, and competition from introduced species (T.K. Twongo and J. Kazembe, pers. comm., East African Freshwater Biodiversity Assessment workshop, Dec. 2003).
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/60365

Population:

Population

Information on relative abundance is scanty. It has a large extent of occurrence but the population size in lakes has been reduced by competition from introduced fish species (Ogutu-Ohwayo 1990, Ogutu-Ohwayo 1995, Twongo, pers. comm.). It is common in fisheries catches in Akagera associated lakes.

Population Trend

Decreasing
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/60365

Threats:

Major Threats

Domestic pollution; illegal fishing methods; fisheries pressure; loss of wetland habitats due to agricultural expansion; and competitive displacement by introduced species.
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/60365

Endangered (EN) (A2bcde)

Licensehttp://creativecommons.org/licenses/by-nc/3.0/
Rights holder/AuthorPascualita Sa-a, FishBase
Sourcehttp://www.fishbase.org/summary/SpeciesSummary.php?id=10919
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith