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Cromeria occidentalis Daget, 1954

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Cromeria occidentalis
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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.

Environment: milieu / climate zone / depth range / distribution range 生態学

; 新鮮な水 底生の漂泳性; pH range: 6.2 - 7.5. Tropical; 25°C - 30°C (Ref. 91322)

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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).

サイズ / 重さ / 年齢

Maturity: Lm ?  range ? - ? cm
Max length : 4.4 cm SL オス/雌雄の選別がない; (Ref. 91321)

簡単な記述 検索表 | 形態学 | 形態計測学

背鰭 (合計) : 9 - 10; 臀鰭: 7 - 8; 脊つい: 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).

生物学     用語集 (例 epibenthic)

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).

Life cycle and mating behavior Maturities | 繁殖 | Spawnings | Egg(s) | Fecundities | 幼生

主な参考文献 Upload your references | 参考文献 | コーディネーター | 協力者

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のレッドリストの状況は (Ref. 130435)

  軽度懸念 (LC) ; Date assessed: 15 May 2019

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

人間に対する脅威

  Harmless





Human uses

FAO - Publication: search | FishSource |

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Estimates based on models

Phylogenetic diversity index (Ref. 82804):  PD50 = 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).
Fishing Vulnerability (Ref. 59153):  Low vulnerability (10 of 100).