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Osteoglossiformes (Bony tongues) >
Mormyridae (Elephantfishes)
Etymology: Marcusenius: Becasue of J. Marcusen, author of "Zur Phauna des Schwarzen Meeres", 1867; ichthyologist; devosi: Marcusenius devosi is named in honour of Dr. Luc De Vos, late curator of fishes at Nairobi Museum, for his contributions to African ichthyology and promotion of ichthyology in East Africa (Ref. 75962).
Environment: milieu / climate zone / depth range / distribution range
Sinh thái học
; Nước ngọt gần đáy. Tropical
Africa: Tana River, but range extension both to the north and south likely (Ref. 75962).
Bộ gần gũi / Khối lượng (Trọng lượng) / Age
Maturity: Lm ? range ? - ? cm
Max length : 121 cm SL con đực/không giới tính; (Ref. 75962)
Short description
Hình thái học | Sinh trắc học
Các tia vây lưng cứng (tổng cộng): 0; Các vây lưng mềm (tổng cộng): 21-24; Tia cứng vây hậu môn 0; Tia mềm vây hậu môn: 26 - 30. Diagnosis: Marcusenius devosi can be distinguished from its congeners by the following characters: distance dorsal fin origin to end of caudal peduncle 39.5-43.4% of standard length, preanal distance 57.0-61.0% of standard length, predorsal distance 59.8-64.0% of standard length, caudal peduncle length 19.2-22.1% of standard length, number of scales in linear series along the lateral line row 56-66, dorsal fin rays 21-24, anal fin rays 26-30, and 14-18 scales around caudal peduncle (Ref. 75962). Electric organ discharge lacking weak head-negative pre-potential, strong Namp relative to Pamp, but short Ndur, Pdur of long duration (Ref. 75962).
description: Head with terminal mouth well in front of eye, mental lobe on lower jaw protruding beyond upper jaw; head and body dorsolaterally compressed (Ref. 75962). Dorsal fin situated about two thirds of standard length from snout, obliquely orientated, anteriorly higher and posteriorly lower, distal margin sometimes only slightly crescentic with anterior two or three rays longer than posterior rays, number of rays 21-24; anal fin opposite dorsal fin with distinctly more anterior origin, obliquely orientated, anteriorly lower and posteriorly higher, anterior rays longer than posterior ones, especially in males where they also appear stronger and often darkened, distal margin crescentic, number of rays 26-30 (Ref. 75962). Scales cycloid with reticulate striae, scales extending anteriorly to operculum and pectoral fins; scales on caudal peduncle circumference, 14-18 (Ref. 75962). Caudal peduncle relatively deep, subcylindrical enire length, usually 19.0-21.0 on standard length (Ref. 75962). Electric organ discharge biphasic lacking a weak pre-potential, Pamp of relatively long duration, increasing with standard length at least in females and juveniles, Ndur of very short duration, but very strong Namp; no sexual dimorphism recognized (Ref. 75962).
Colouration: Colour in preservation: head and back when seen from above, dark; body sides light brown to light ochre, the ochre found especially on lower parts and underside; dorsal fin usually darker than anal fin; homogeneous colouration without any blotches, increasingly lighter from back to belly (Ref. 75962).
Life cycle and mating behavior
Chín muồi sinh dục | Sự tái sinh sản | Đẻ trứng | Các trứng | Sự sinh sản | Ấu trùng
Kramer, B., P. Skelton, H. van der Bank and M. Wink, 2007. Allopatric differentiation in the Marcusenius macrolepidotus species complex in southern and eastern Africa: the resurrection of M. pongolensis and M. angolensis, and the description of two new species (Mormyridae, Teleostei). J. Nat. Hist. 41(9-12):647-708. (Ref. 75962)
IUCN Red List Status (Ref. 130435)
Threat to humans
Harmless
Human uses
Thêm thông tin
Age/SizeSự sinh trưởngLength-weightLength-lengthLength-frequenciesSinh trắc họcHình thái họcẤu trùngSự biến động ấu trùngBổ xungSự phong phúBRUVS
Các tài liệu tham khảoNuôi trồng thủy sảnTổng quan nuôi trồng thủy sảnCác giốngDi truyềnElectrophoresesDi sảnCác bệnhChế biếnNutrientsMass conversion
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00562 (0.00251 - 0.01261), b=3.05 (2.85 - 3.25), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Mức dinh dưỡng (Ref.
69278): 3.2 ±0.4 se; based on size and trophs of closest relatives
Thích nghi nhanh (Ref.
120179): Rất thấp, thời gian nhân đôi của chủng quần tối thiểu là hơn 14 năm (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Very high vulnerability (89 of 100).
