Klassifizierung / Names
Namen | Synonyme | Catalog of Fishes(Gattung, Arten) | ITIS | CoL | WoRMS | Cloffa
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Gonorynchiformes (Milkfishes) >
Kneriidae (Shellears)
Etymology: Cromeria: Perhaps related to the prehistoric Stone Age in eastern England; for the stone implements found in Cromer but needs more data.
Eponymy: Lord Cromer Evelyn Baring (1841–1917), 1st Earl of Cromer, was a soldier (1858–1877) and a particularly oppressive and racist colonial administrator. [...] (Ref. 128868), visit book page.
Umwelt: Milieu / Klimazone / Tiefenbereich / Verbreitungsgebiet
Ökologie
; süßwasser benthopelagisch; pH range: 6.2 - 7.5. Tropical; 25°C - 30°C (Ref. 91322)
Africa: basins of upper and middle Niger River, Benoué and upper Volta in Guinea, Mali, Burkina Faso, Ghana, Benin, Cameroon (Ref. 57474), Chad (Ref. 367) and Ivory Coast (Ref. 3066). Probably also in Togo, Nigeria and Niger (Ref. 57474).
Größe / Gewicht / Alter
Geschlechtsreife: Lm ?  range ? - ? cm
Max length : 4.4 cm SL Männchen/unbestimmt; (Ref. 91321)
Kurzbeschreibung
Bestimmungsschlüssel | Morphologie | Morphometrie
Rückenflossenweichstrahlen (insgesamt) : 9 - 10; Afterflossenweichstrahlen: 7 - 8; Wirbelzahl: 40 - 43. Diagnosis: pelvic fin origin at level of anterior base of dorsal fin; preorbital stripe present; caudal peduncle depth 6.9-11% of SL; dorsal precaudal fin fold not reaching base of dorsal fin; 8-9 pectoral fin rays; 7 pelvic fin rays; 2 supernumerary rays in anal fin; 8 dorsal fin pterygiophores; 9+9 principal caudal fin rays; cephalic lateral line canals and supraorbital bone present; parasphenoid wide, with foramina for internal carotid arteries; neural spine of 2nd vertebra short and wide, only the length of its vertebral centrum and different from subsequent neural spines (Ref. 57474).
Body shape (shape guide): elongated; Cross section: compressed.
Maximum TL was recorded at 4.1 cm (Ref. 3566). Occurs on several substrates from fine mud to rough gravel and plant material; almost never buries into the substrate (Ref. 57474). Feeds on plankton (Ref. 57474, 91322) and phytoplankton (Ref. 91322). Reproduction likely takes place during the rainy season (August to September) (Ref. 57474) at high water levels in floodplains, brooks or rice fields (Ref. 91276, 91322).
Lebenszyklus und Paarungsverhalten
Geschlechtsreife | Fortpflanzung | Ablaichen | Eier | Fruchtbarkeit | Larven
Moritz, T., R. Britz and K.E. Linsenmair, 2006. Cromeria nilotica and C. occidentalis, two valid species of the African freshwater fish family Kneriidae (Teleostei: Gonorhynchiformes). Ichthyol. Explor. Freshwat. 17(1):65-72. (Ref. 57474)
IUCN Rote Liste Status (Ref. 130435: Version 2025-2 (Global))
Bedrohung für Menschen
Harmless
Nutzung durch Menschen
Tools
Zusatzinformationen
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Internet Quellen
Schätzungen auf der Grundlage von Modellen
Phylogenetischer Diversitätsindex (Ref.
82804): PD
50 = 0.7500 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00389 (0.00180 - 0.00842), b=3.12 (2.94 - 3.30), in cm total length, based on all LWR estimates for this body shape (Ref.
93245).
Anfälligkeit der Fischerei (Ref.
59153): Low vulnerability (10 of 100).
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