@article {500, title = {Growth pattern and natural mortality of elephant fishes (Mormyrus kannume, Mormyridae) in the Damietta branch of Nile, Egypt}, journal = {The Egyptian Journal of Aquatic Research}, year = {2016}, month = {Jan-05-2016}, abstract = {

The present study sheds light on the growth pattern of the elephant snout fish (Mormyrus kannume, Mormyridae) in the Damietta branch of the Nile during the period from January to December 2010. This is done through studying the biometric characters, length\–weight relationship, condition factors, growth performance index as well as the natural mortality. The linear regression for 15 morphometric characters in total length and 4 morphometric characters in head length was applied. The higher coefficient of the characters\’ determinations which fit best was also applied. Five meristic characters were determined (dorsal fin rays, 49\–69; pectoral fin rays, 12\–15; ventral fin rays, 6; anal fin rays, 17\–21 and vertebrae, 49\–52). Fish length varied between 14.0 cm and 43.0 cm TL with a modal length range from 19 to 22 cm representing 61.36\% of the fish sample. A length\–weight relationship using the total weight was found to be Log W = \−2.2218 + 3.063 Log L (R2 = 0.997) and using the gutted weight was Log W = \−2.1549 + 3.003 Log L (R2 = 0.995) hence exhibiting isometric growth. The average condition factors for different lengths were 0.76 \± 0.06. The chi-square of the overall sex ratio (male:female = 1:0.42) was significant at P \< 0.01. The life span of this species is five years, with individuals of two years of age dominating the population. The different growth parameters were estimated at (K = 0.141, to = \−0.271, L\∞ = 80.65 cm, W\∞ = 4151 g, ФL = 2.96 and ФW = 1.56). The natural mortality was 0.34, the M/K ratio was 2.38 and the variation of M by age model was also computed.

}, issn = {16874285}, doi = {10.1016/j.ejar.2016.04.002}, url = {http://linkinghub.elsevier.com/retrieve/pii/S168742851630019X}, author = {Ragheb, Evelyn} } @article {464, title = {Notes on the electric organ discharges (EODs) of four Mormyrus-species (Osteoglossomorpha: Mormyridae) from the Nilo-Sahelo-Sudan ichthyofaunal province of Africa}, journal = {Cybium}, volume = {39}, year = {2015}, month = {05/2015}, pages = {3{\textendash}10}, chapter = {3}, abstract = {

Field studies on the electric organ discharges (EODs) of Mormyrus species are rare, likely due to their biology hindering live capture in large numbers. Here the EODs of four Nilo-Sahelo-Sudanic species, Mormyrus caschive Linnaeus, 1758, M. kannume Forssk\ål, 1775, M. hasselquistii Valenciennes, 1847 and M. rume Valenciennes,1847, are compared and discussed. Their discharges are largely equal to each other, mainly showing differences in length and peak of Fourier transformation with less pronounced differences in the relative amplitude of phases within an EOD. The discharge properties allow species discrimination, at least within eco-regions, and thus likely play a role in species recognition.

}, keywords = {electric organ discharge, EODs, mormyrids, Mormyrus}, url = {http://www.researchgate.net/profile/Timo_Moritz/publication/276247346_Notes_on_the_electric_organ_discharges_(EODs)_of_four_Mormyrus-species_(Osteoglossomorpha_Mormyridae)_from_the_Nilo-Sahelo-Sudan_ichthyofaunal_province_of_Africa/links/5553180908ae6943a}, author = {Moritz, T.} } @inbook {442, title = {Deux cent quinzi{\`e}me genre. Les Mormyres in Histoire Naturelle des Poissons}, volume = {tome 5}, year = {1803}, pages = {618-625}, address = {Paris}, author = {Lacep{\`e}de, B.G.E.} } @book {813, title = {Descriptiones animalium avium, amphibiorum, piscium, insectorum, vermium; quae in itinere orientali observavit...}, series = {Post mortem auctoris edidit Carsten Niebuhr. Hauniae.}, year = {1775}, pages = {1-20 + i-xxxiv + 1-164, map.}, url = {http://biodiversitylibrary.org/page/41527424}, author = {Forssk{\r a}l, P. S.} } @inbook {121, title = {Catalogue of the Fresh-Water Fishes of Africa in the British Museum (Natural History)}, booktitle = {Catalogue of the Fresh-Water Fishes of Africa in the British Museum (Natural History)}, volume = {I}, year = {1909}, pages = {29-145}, publisher = {British Museum (Natural History)}, organization = {British Museum (Natural History)}, address = {London}, url = {https://biodiversitylibrary.org/page/37889609}, author = {George A. Boulenger} } @book {902, title = {The fishes of the Nile}, series = {Zoology of Egypt}, year = {1907}, publisher = {Pub. for the Egyptian government by H. Rees, ltd.}, organization = {Pub. for the Egyptian government by H. Rees, ltd.}, address = {London}, doi = {10.5962/bhl.title.51710}, url = {http://www.biodiversitylibrary.org/item/110263$\#$page/1/mode/1up}, author = {George A. Boulenger} } @article {608, title = {A revision of the genera and species of fishes of the family Mormyridae}, journal = {Proceedings of the General Meetings for Scientific Business of the Zoological Society of London}, volume = {1898}, number = {Part 4}, year = {1899}, pages = {775-821}, url = {http://www.biodiversitylibrary.org/item/97095$\#$page/919/mode/1up}, author = {George A. Boulenger} } @book {159, title = {The Mormyridae and other Osteoglossomorpha (CD-ROM)}, series = {World Biodiversity Database, CD-ROM Series}, volume = {2000}, year = {2000}, publisher = {Springer Verlag, ETI-UNESCO}, organization = {Springer Verlag, ETI-UNESCO}, address = {New York}, issn = {Hyb: 3-540-14811-6}, url = {https://www.amazon.com/Mormyridae-Osteoglossomorpha-Biodiversity-Database-CD-ROM/dp/3540148116}, author = {Harder, W.} } @article {898, title = {Variation of electric organ discharge in Mormyrus kannume (Mormyridae) from south-western Ethiopia in relation to individual size, sex and reproductive status}, journal = {Journal of Ichthyology}, volume = {54}, year = {2014}, month = {3/2014}, pages = {177 - 185}, abstract = {

Five variables of the electric organ discharge (EOD) were studied in 132 freshly caught individuals of Mormyrus kannume from the Gibe and Gojeb rivers (the enclosed Omo-Turkana system) and Baro River (the White Nile system) in south-western Ethiopia, East Africa. Most individuals exhibited the typical biphasic EODs with an initial head-positive phase followed by a head-negative phase exceeding initial one in the relative amplitude. In three repeated samples from the Gibe, stable differences in the discharge variables between females and males were found, while no sex differences were observed in other samples. In three cases, a positive correlation between the individual size and discharge duration was found: in two male subsamples from the Gibe and in a mixed sample of both sexes from the Gojeb. In most samples studied, some males exhibited the outstandingly long EOD duration. At the same time, no relationships between the discharge variables and reproductive status of individuals were found. The possible influence of individual and intra-individual variations on the results of inter-population and interspecific comparisons of the discharge variables in mormyrids are highlighted.

}, issn = {1555-6425}, doi = {10.1134/S0032945214020039}, url = {http://link.springer.com/10.1134/S0032945214020039http://link.springer.com/content/pdf/10.1134/S0032945214020039}, author = {Alexander Golubtsov and Orlov, A. A.} }