Diagnostic Description
provided by Fishbase
Diagnosis: dorsal fin greater than twice the length of anal fin; dorsal origin nearer tip of snout than caudal fin base; snout 2-2.5 times in head length; caudal peduncle less than 4 times in standard length (Ref. 52193).Description: forebody and head relatively strongly decurved; females smaller and deeper bodied than males; teeth small, bicuspid, 5â7 in upper jaw, 8â12 in lower jaw; gill slits inclined on sides only (Ref. 52193).Coloration: olive grey or brown above, lighter below (Ref. 52193).
Diseases and Parasites
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Afrolernaea Infestation. Parasitic infestations (protozoa, worms, etc.)
Migration
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Potamodromous. Migrating within streams, migratory in rivers, e.g. Saliminus, Moxostoma, Labeo. Migrations should be cyclical and predictable and cover more than 100 km.
Morphology
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Dorsal spines (total): 0; Dorsal soft rays (total): 65 - 75; Anal spines: 0; Analsoft rays: 17 - 19
Trophic Strategy
provided by Fishbase
Found in caves and muddy areas, also hides among weeds. Forms shoal (Ref. 13337). Feeds on insects and weeds but may also feed on small fishes (Ref. 5595), blood worms, small crustaceans and molluscs (Ref. 13337).
- Recorder
- Drina Sta. Iglesia
Biology
provided by Fishbase
Found in caves and muddy areas, also hides among weeds (Ref. 13337). Favours quiet deep water with a soft muddy bottom (Ref. 52193). Forms shoals (Ref. 13337, 52193). Feeds on weeds (Ref. 5595) and insects but may also feed on small fishes (Ref. 5595, 52193) and fish eggs (Ref. 52193), blood worms (Ref. 13337), small crustaceans and mollusks (Ref. 13337, 52193). Active mainly at night; breeds during the rainy season, moving upstream in rivers after flood spates have receded (Ref. 52193). Migrations appears to occur at irregular interval as this fish is not a powerful swimmer and would not be able to cope with very high water current (Ref. 13337). Females carry 10,000-70,000 eggs; can give a mild shock when caught (Ref. 7248, 52193).
Importance
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fisheries: commercial; gamefish: yes; aquarium: commercial
Mormyrus longirostris
provided by wikipedia EN
Mormyrus longirostris, commonly referred as the eastern bottle-nosed mormyrid, is a medium-sized ray-finned fish species belonging to the family Mormyridae. It was originally described by Wilhelm Peters in Monatsberichte der Akad. Wiss. Berlin, 1852.[2]
This species grows to a maximum length of 75 centimetres (30 in) and can weigh up to 10 kilograms (22 lb). The dorsal fin is more than twice the length of the anal fin. The dorsal origin is nearer to the tip of the snout than to the caudal fin base.
Ecology
It primarily feeds on weeds and insects, but also on small vertebrates, such as small fish and fish eggs. They hunt using electricity and can give a mild electric shock to defend itself.
Range and habit
M. longirostris can be found in abundance across the plains of Africa in freshwater habitats, including the lower and middle Zambezi, lower Sabi and Ludi rivers and in the Luapula-Moero-Bangwelo (Zambian Congo system). It inhabits the Ruvuma and Rufiji rivers in Tanzania, lakes Malawi, Tanganyika and Rukwa and other eastward-flowing rivers in Tanzania.
The species lives in caves and muddy areas with soft bottoms. It hides in weeds and characteristically forms small shoals.
Life history/behavior
Active mostly at night, it breeds during the summer rainy season, moving upstream in rivers after water has receded, with migrations at irregular intervals. Females carry 10,000–70,000 eggs at a time.
Relationship to humans
The fish is harvested for food with bait and hook.[3]
References
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^ Konings, A., Bills, R., Getahun, A., Kazembe, J., Marshall, B. & Moelants, T. (2019). Mormyrus longirostris (amended version of 2018 assessment). The IUCN Red List of Threatened Species 2019. doi:10.2305/IUCN.UK.2018-2.RLTS.T182025A155052229.en
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^ Günther, Albert (1866). Catalogue of the Fishes in the British Museum. Vol. 6. London: Taylor and Francis. p. 216. OCLC 6392489.
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^ Skelton, Paul H. (2001). "Eastern bottlenose / oostelike bottelneus, Mormyrus longirostris Peters, 1852". A Complete Guide to the Freshwater Fishes of Southern Africa. Cape Town: Struik. pp. 95–96. ISBN 9781868726431.
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Mormyrus longirostris: Brief Summary
provided by wikipedia EN
Mormyrus longirostris, commonly referred as the eastern bottle-nosed mormyrid, is a medium-sized ray-finned fish species belonging to the family Mormyridae. It was originally described by Wilhelm Peters in Monatsberichte der Akad. Wiss. Berlin, 1852.
This species grows to a maximum length of 75 centimetres (30 in) and can weigh up to 10 kilograms (22 lb). The dorsal fin is more than twice the length of the anal fin. The dorsal origin is nearer to the tip of the snout than to the caudal fin base.
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