02411nas a2200241 4500008004100000022001400041245014100055210006900196260001600265300001200281490000900293520162800302653002101930653002701951653001501978653003701993653002002030100001902050700001602069700001402085700001802099856005202117 2025 eng d a2658-351800aLength-weight relationships and condition factors of Mormyridae species in the Niger River: implications for conservation and management0 aLengthweight relationships and condition factors of Mormyridae s cJan-01-2025 a215-2210 v20253 a

The length-weight relationship and condition factor of the ten most abundant Mormyridae species in the Niger River at Niamey were examined from August to November 2023. The species assessed were Mormyrus rume, Campylomormyrus tamandua, Pollimyrus isidori, Brienomyrus niger, Hyperopisus bebe, Mormyrus macrophthalmus, Mormyrops anguilloides, Brevimyrus niger, Mormyrops oudoti, Cyphomyrus Psittacus, and Marcusenius cyprinoides. Analysis of their length-weight relationships revealed “b” values ranging from 2.08 to 2.87, suggesting negative allometric growth across all species. Condition factor (k) values varied from 1.22 ± 0.31 for H. bebe to 10.48 ± 2.83 for M. cyprinoides, with no significant differences in average condition factors among the species. These findings highlight the potential vulnerability of Mormyridae species to environmental changes and anthropogenic pressures, emphasizing the need for targeted conservation measures. The results underscore the importance of sustainable fisheries management practices to preserve biodiversity and ensure the long-term productivity of the Niger River ecosystem. The observed negative allometric growth patterns indicate that environmental conditions may be suboptimal for these species, potentially due to factors such as habitat degradation, water quality issues, or overfishing. Addressing these challenges through habitat restoration and regulatory measures could enhance the resilience of fish populations and support sustainable fisheries.

10acondition factor10alength-weight analysis10aMormyridae10asustainable fisheries management10athe Niger River1 aSouley, S.M.N.1 aHarouna, M.1 aAdo, M.I.1 aYoussoufa, I. uhttps://doi.org/10.31951/2658-3518-2025-a-2-21502377nas a2200277 4500008004100000245015600041210006900197260001800266300001000284490000600294520155800300653001701858653001101875653001201886653001301898653001501911653002101926100001801947700001401965700001501979700001701994700001402011700001602025700001202041856004602053 2024 eng d00aDiet of some fish species of the family Mormyridae (Actinopterygii: Teleostei; Bonaparte, 1831) from the upper Sanaga River, Central Region of Cameroon0 aDiet of some fish species of the family Mormyridae Actinopterygi c31 March 2024 a51-620 v63 a

This study was carried out between October 2020 and October 2021 with the aim of determining sustainable management options and nutrition for the domestication of Mormyridae fish species living in the Sanaga River in central Cameroon. For this purpose, 451 specimens collected from local fishermen were identified and grouped into four genera and seven species, constituting 20.84% Campylomormyrus phantasticus (Pellegrin), 5.32% Hippopotamyrus castor (Pappenheim), 24.61% Mormyrops anguilloides (Linnaeus), 18.63% Mormyrops caballus (Pellegrin), 4.66% Mormyrops zanclirostris (Günther, 1867), 15.52% Mormyrus rume (Valenciennes), and 10.42% Mormyrus tapirus (Pappenheim). Fish were measured, and parameters were obtained after dissection using intestinal morphometric characteristics and stomach content analysis methods. The emptiness coefficient varied from 0% (Hippopotamyrus castor and Mormyrops zanclirostris) to 26.66% (Mormyrus rume). The relative mass of the intestine was low in all studied species; the intestinal coefficient and the Zihler index of all these species are within the range of carnivorous species. Analysis of stomach contents revealed a broad food spectrum containing twelve categories of prey. Insects, macrophytes and larval insect shelters were the preferred foods of Mormyrops anguilloides, Mormyrops caballus and Mormyrops zanclirostris, while insect larvae and larval shelters were the preferred prey for other species. Site and season had little effect on the categories of prey consumed by these species.

10aBiodiversity10aEbebda10afeeding10aMonatele10aMormyridae10astomach contents1 aAkohogni, MAM1 aMedjo, KE1 aZebaze, TB1 aChiassa, NKA1 aMepa, TCP1 aTiogué, TC1 aFon, ED uhttp://dx.doi.org/10.22034/JAD.2024.6.1.500461nas a2200109 4500008004100000245009000041210006900131260007900200490000700279100001300286856005200299 1976 eng d00aExploration du Parc National de l'Upemba Mission G.F. De Witte, Fascicule 73 Poissons0 aExploration du Parc National de lUpemba Mission GF De Witte Fasc aBrusselsbFondation Pour Favoriser Les Recherches Scientifiques en Afrique0 v731 aPoll, M. uhttps://mormyrids.efishgenomics.com/en/node/63301433nas a2200145 4500008004100000022002500041245006500066210006500131260001600196520097300212100002301185700002201208700001701230856004001247 2023 eng d a0021-8782, 1469-758000aOntogeny reveals the origin of Gemminger bones in Mormyridae0 aOntogeny reveals the origin of Gemminger bones in Mormyridae cJul-25-20233 a

Mormyridae are well known and intensively studied for their weak electric organ discharges, which facilitate communication and orientation. The Gemminger bones of Mormyridae are located next to the electrical organ in the caudal peduncle; however, they have not attracted much interest until recently. Therefore, we investigated the diversity of Gemminger bones in mormyrids and studied their ontogenetic development in Mormyrus rume proboscirostris. Gemminger bones are paired, thin, elongated ossifications lying on the dorsal and ventral sides of the caudal peduncle, and usually reach anterior well below the dorsal and anal fin bases. Ontogeny revealed that they are not intermuscular ossifications, as suspected based on the anatomical position of this structure and the systematic position of the mormyrids. Instead, they are membrane ossifications that originate from the fin stays of the dorsal and anal fins.

1 aKoch, Ann‐Katrin1 aKirschbaum, Frank1 aMoritz, Timo uhttp://dx.doi.org/10.1111/joa.1393500858nas a2200145 4500008004100000022001400041245009800055210006900153260001600222520037400238100001900612700002200631700001700653856004200670 2022 eng d a2687-794500aThe Complete Genome Sequences of 38 Species of Elephantfishes (Mormyridae, Osteoglossiformes)0 aComplete Genome Sequences of 38 Species of Elephantfishes Mormyr cNov-21-20223 a

We present the complete genome sequences of 38 species of elephantfishes from 20 genera. Illumina sequencing was performed on genetic material from single wild-caught individuals. The reads were assembled using a de novo method followed by a finishing step. The raw and assembled data is publicly available via Genbank.

1 aPeterson, Rose1 aSullivan, John, P1 aPirro, Stacy uhttp://dx.doi.org/10.56179/001c.5607701955nas a2200157 4500008004100000245018500041210006900226260002000295300001200315490000700327520133800334100001901672700001901691700002201710856006501732 2021 eng d00aFrom fin rays to DNA: supplementary morphological and molecular data to identify Mormyrus subundulatus Roberts, 1989 (Pisces: Mormyridae) from the Bandama River in Côte d’Ivoire0 aFrom fin rays to DNA supplementary morphological and molecular d c20 October 2021 a649-6580 v433 a

The genus Mormyrus Linnaeus, 1758 has been well studied in western Africa where five species are currently recognized. Mormyrus subundulatus Roberts, 1989 was described in 1989, and, although morphologically and genetically close to Mormyrus rume Valenciennes, 1847, is still considered by the most recent studies as a distinct species. It is endemic to the Côte d’Ivoire and Ghana River systems. It was historically recorded from only three locations but is today very likely extirpated from one of them and threatened in the remaining two. It is categorized as “Vulnerable B1ab(iii)” by the IUCN Red List (Dankwa 2020). Although a few papers describe precisely the morphology and electric signal of the species, they are based on a very limited number of samples. In this paper, we present new data on the morphological characteristics of the species (extending the dorsal fin rays count range, which is the main morphometric criterium to distinguish M. subundulatus and M. rume) based on Museum samples and samples collected recently a few kilometers away from the type locality. Determination of the newly collected material was confirmed by the analysis of a frag- ment of the Cytochrome b gene, and we produced the first sequence fragment of the cytochrome oxydase subunit 1 (COI) for this species.

1 aPrié, Vincent1 aAdam, Benjamin1 aMelki, Frédéric uhttps://sciencepress.mnhn.fr/en/periodiques/zoosystema/43/2700486nas a2200109 4500008004100000245011200041210006900153260007500222300001100297100001600308856005200324 1967 eng d00aThe fishes and fisheries of the Ruaha River basin, Tanzania (systematics, ecology, zoogeography, fisheries)0 afishes and fisheries of the Ruaha River basin Tanzania systemati aJinja, UgandabEast African Freshwater Fisheries Research Organization a19 pp.1 aMatthes, H. uhttps://mormyrids.efishgenomics.com/en/node/59900535nam a2200121 4500008004100000245015200041210006900193260002200262300003200284490003000316100001500346856005200361 1868 eng d00aNaturwissenschaftliche Reise nach Mossambique auf Befehl Seiner Majestät des Königs Friedrich Wilhelm IV in den Jahren 1842 bis 1848 ausgeführt.0 aNaturwissenschaftliche Reise nach Mossambique auf Befehl Seiner  aBerlinbG. Reimer a i-viii + 1-116, Pls. 1-20.0 vZoologie. IV. Flussfische1 aPeters, W. uhttps://mormyrids.efishgenomics.com/en/node/56800466nas a2200133 4500008004100000245009700041210006900138300000900207490000800216100001700224700001600241700001800257856005700275 1999 eng d00aFreshwater fishes of Ghana: identification, distribution, ecological and economic importance0 aFreshwater fishes of Ghana identification distribution ecologica a1-530 v2831 aDankwa, H.R.1 aAbban, E.K.1 aTeugels, G.G. uhttps://www.nhbs.com/freshwater-fishes-of-ghana-book00329nas a2200097 4500008004100000245005200041210005100093300001800144100002000162856004900182 1861 eng d00aMémoire sur les poissons de l'Afrique australe0 aMémoire sur les poissons de lAfrique australe ai-vii + 1-78.1 aCastelnau, F.L. uhttps://biodiversitylibrary.org/page/172284002166nas a2200121 4500008004100000022001300041245012900054210006900183260001600252520169100268100001901959856006601978 2016 eng d a1687428500aGrowth pattern and natural mortality of elephant fishes (Mormyrus kannume, Mormyridae) in the Damietta branch of Nile, Egypt0 aGrowth pattern and natural mortality of elephant fishes Mormyrus cJan-05-20163 a

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.

1 aRagheb, Evelyn uhttp://linkinghub.elsevier.com/retrieve/pii/S168742851630019X00424nas a2200121 4500008004100000245007700041210006900118260002000187300002000207490000600227100002000233856004900253 1922 eng d00aContribuzione alla conoscenza della fauna ittiologica dello Uebi Scebeli0 aContribuzione alla conoscenza della fauna ittiologica dello Uebi c30 October 1922 a1–12., Pl. 5.0 v91 aVinciguerra, D. uhttp://biodiversitylibrary.org/page/2984923001550nas a2200181 4500008004100000245016700041210006900208260001200277300001100289490000700300520072100307653002901028653000901057653001401066653001301080100001501093856026001108 2015 eng d00aNotes on the electric organ discharges (EODs) of four Mormyrus-species (Osteoglossomorpha: Mormyridae) from the Nilo-Sahelo-Sudan ichthyofaunal province of Africa0 aNotes on the electric organ discharges EODs of four Mormyrusspec c05/2015 a3–100 v393 a

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 Forsskål, 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.

10aelectric organ discharge10aEODs10amormyrids10aMormyrus1 aMoritz, T. uhttp://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/5553180908ae6943a00469nas a2200133 4500008004100000245010400041210007000145300001200215490000700227100001500234700001500249700002000264856005100284 1973 eng d00aContribution a l’étude de la faune ichthyologique du bassin du fleuve Sénégal. III. Mormyridae0 aContribution a l étude de la faune ichthyologique du bassin du f a665-7040 v351 aReizer, C.1 aMattei, X.1 aChevalier, J.L. uhttps://mormyrids.efishgenomics.com/en/node/98