Gymnarchus niloticus: Lalèyè, P., Azeroual, A., Entsua-Mensah, M., Getahun, A., Moelants, T. & Vreven, E.

2019 ◽  
Author(s):  
Keyword(s):  
Gymnarchus Niloticus

Polycyclic Aromatic Hydrocarbons in Smoked Ethmalosa fimbriata and Gymnarchus niloticus from Selected Fish Markets in the Niger Delta, Nigeria

2018 ◽  
Vol 40 (5) ◽  
pp. 1367-1380 ◽  
Author(s):  
Chukwujindu M. A. Iwegbue ◽  
Diemiruaye Odogbor ◽  
Francis E. Egobueze ◽  
Onoriode O. Emoyan ◽  
Godswill O. Tesi ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Niger Delta ◽  
Gymnarchus Niloticus ◽  
Polycyclic Aromatic

scholarly journals Nilonema gymnarchi (Nematoda: Philometridae) and trace metals in Gymnarchus niloticus of Epe lagoon in Lagos State, Nigeria

Heliyon ◽  
2020 ◽  
Vol 6 (9) ◽  
pp. e04959
Author(s):  
Patrick Omoregie Isibor ◽  
Bamidele Akinsanya ◽  
Temitope Sogbamu ◽  
Fatsuma Olaleru ◽  
Akeredolu Excellence ◽  
...  
Keyword(s):  
Trace Metals ◽  
Gymnarchus Niloticus ◽  
Lagos State

Concentrations and Profiles of Polycyclic Aromatic Hydrocarbons in Some Popular Fish Species in Nigeria

2015 ◽  
Vol 78 (3) ◽  
pp. 554-560 ◽  
Author(s):  
CHUKWUJINDU M. A. IWEGBUE ◽  
GODSWILL O. TESI ◽  
LORETTA C. OVERAH ◽  
FRANCISCA I. BASSEY ◽  
FRANK O. NWADUKWE ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Fish Species ◽  
Aromatic Hydrocarbons ◽  
Gadus Morhua ◽  
Gas Chromatography Mass Spectrometry ◽  
The European Union ◽  
Trachurus Trachurus ◽  
Gymnarchus Niloticus ◽  
Fish Samples ◽  
Polycyclic Aromatic

The concentrations and profiles of polycyclic aromatic hydrocarbons (PAHs) in 10 popular fish species in the Nigerian market were determined with a view to providing information on the health hazards associated with the consumption of these fish species. The concentrations of PAHs were measured by gas chromatography–mass spectrometry after extraction by ultrasonication with acetone-dichloromethane and clean up. The concentration ranges of the Σ16 PAHs were 20 to 39.6 μg kg−1 for Parachanna obscura (African snake head), 6.8 to 532.3 μg kg−1 for Oreochromis niloticus (tilapia), 7.4 to 91.1 μg kg−1 for Gymnarchus niloticus (Asa), 13.1 to 34.1 μg kg−1 for Sebastes fasciatus (red fish), 11.2 to 80.0 μg kg−1 for Gadus morhua (cod), 23.9 to 34.6 μg kg−1 for Chrysicthys nigrodigitatus (silver cat fish), 63.4 to 131.4 μg kg−1 for Sardinella aurita (sardine), 22 to 52.9 μg kg−1 for Trachurus trachurus (Atlantic horse mackerel), 21.0 to 63.7 μg kg−1 for Scomber scombrus (mackerel), and 27.7 to 44.5 μg kg−1 for Pseudotolithus senegalensis (croaker). Benzo[a]pyrene occurred in 23% of these fish samples at concentrations above the European Union permissible limit of 2.0 μg kg−1. The calculated margins of exposure based on the indicators for occurrence and effects of PAHs were greater than 10,000 indicating no potential risk for the consumers of the species evaluated in this study.

Zum Frequenzverhalten von Gymnarchus niloticus Cuv. (Mormyriformes, Teleostei)

1966 ◽  
Vol 54 (1) ◽  
pp. 85-88 ◽  
Author(s):  
Wilhelm Harder ◽  
Hartmut Uhlemann
Keyword(s):  
Gymnarchus Niloticus

Undulatory median fin propulsion of two teleosts with different modes of life

1980 ◽  
Vol 58 (11) ◽  
pp. 2116-2119 ◽  
Author(s):  
R. W. Blake
Keyword(s):  
Electric Fish ◽  
Flow Model ◽  
Low Frequency ◽  
Leading Edge ◽  
Large Area ◽  
Propulsive Efficiency ◽  
Dorsal Fin ◽  
Gymnarchus Niloticus ◽  
Mode Of Life ◽  
Modes Of Life

A simple fluid flow model, based on momentum considerations, is employed to calculate the hydromechnanical efficiency of the undulatory dorsal fin propeller of the electric fish (Gymnarchus niloticus) and the seahorse (Hippocampus hudsonius). The undulatory fins of G. niloticus and H. hudsonius are representative of two extreme kinematic styles. The dorsal fin of G. niloticus is characterized by waveforms which are propagated at low frequency and a leading edge which "sweeps out" a large area. In contrast, the leading edge of the dorsal fin of H. hudsonius sweeps out a comparatively small area and waveforms pass down the fin at a high frequency. It is shown that the propulsive efficiency of the dorsal fin of G. niloticus can be up to twice that of H. hudsonius at similar swimming speeds. Possible explanations for the evolution of the two kinematic modes are discussed in relation to the mode of life of the animals.

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