02377nas 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<p>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 (G&uuml;nther, 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.</p>
10aBiodiversity10aEbebda10afeeding10aMonatele10aMormyridae10astomach contents1 aAkohogni, MAM1 aMedjo, KE1 aZebaze, TB1 aChiassa, NKA1 aMepa, TCP1 aTiogué, TC1 aFon, ED  uhttp://dx.doi.org/10.22034/JAD.2024.6.1.502522nas a2200289   4500008004100000022002500041245007300066210006900139260001600208490000700224520164700231653001401878653002001892653002001912653002101932653003201953100002401985700002502009700002202034700002902056700002402085700002002109700002302129700001802152700002102170856004102191       2024                        eng d  a2045-7758, 2045-775800aTrophic ecology of the African riverine elephant fishes (Mormyridae)0 aTrophic ecology of the African riverine elephant fishes Mormyrid  cAug-01-20240 v143 a<p><jats p="">Multiple species of the elephant fishes (Mormyridae) commonly coexist in sympatry in most African tropical rivers and lakes. In this study, we investigated the trophic ecology and potential trophic niche partitioning of eleven mormyrid fish species from the Sanaga River system in Cameroon using the stable isotope composition of carbon and nitrogen in the muscle samples. Albeit most mormyrids mainly feed on invertebrates, we found differences in isotope ratios, and we report signs of the trophic niche partitioning among species. We further found significant differences in isotopic signatures within the <jats italic="">Mormyrus</jats> genus, suggesting ecological niche diversification among three closely related species. We have also evaluated differences in the isotopic signals between seasons in four species, which could be possibly caused by species migration and/or anthropogenic agricultural activities. To evaluate body shape, we applied geometric morphometric analyses, and we show that most of the species are clearly morphologically separated. We focused on the mormyrid ecomorphology to identify a possible interaction between shape and ecology, and we found a relationship between the &delta;<jats sup="">13</jats>C (but not &delta;<jats sup="">15</jats>N) isotopic signal and morphology, suggesting their interplay during mormyrid evolution. Overall, we present robust evidence of the trophic niche partitioning within the mormyrid species community, and we integrate trophic ecology with morphometrics, shedding light on the enigmatic evolutionary history of these fascinating African fishes.</jats></p>
10amormyrids10astable isotopes10atrophic ecology10atrophic position10atrophic resource portioning1 aSommer, Gina, Maria1 aNjom, Samuel, Didier1 aIndermaur, Adrian1 aNyom, Arnold, Roger Bitj1 aJandová, Kateřina1 aKukla, Jaroslav1 aPetrtýl, Miloslav1 aHorká, Petra1 aMusilova, Zuzana  uhttp://dx.doi.org/10.1002/ece3.70173