First insights into karyotype evolution within the family Mormyridae

Ozouf−Costaz, Catherine; Coutanceau, Jean-Pierre; Bonillo, Céline; Belkadi, Laurent; Fermon, Yves; Agnèse, Jean‐François; Guidi‐Rontani, Chantal; Paugy, Didier

doi:10.26028/cybium/2015-393-006

Cited by 4 publications

(2 citation statements)

References 20 publications

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“…Therefore, if 2n = 50 (50a) is the hypothesized basal chromosome composition of the Mormyridae, then it is expected to be found in some Petrocephalus species in addition to its presence in some other old mormyrids genera. Furthermore, the only Petrocephalus species (Petrocephalus microphthalmus; 2n = 50 [2sm+48a]) that has been karyotyped (Ozouf-Costaz et al, 2015) exhibits a chromosome complement close to the hypothesized basal karyotype, raising the hope of its presence in some of the remaining 45 Petrocephalus species that are yet to be karyotyped.…”

Section: Metaphase Chromosomes Preparationmentioning

confidence: 99%

Karyotype of the Mormyrid Baby Whale Fish (Osteoglossiformes: Mormyridae): Brienomyrus Brachyistius in Oluwa River, Nigeria

2022

JBAH

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The mormyrid fishes of the order Osteoglossiformes are abundant in the freshwaters of tropical Africa; the enormous species diversity of the group requires many systematics tools to comprehend this diversity better. Cytogenetics data can complement other systematics procedures to accomplish the above-stated objective, but information on many mormyrids' karyotypes is unavailable. In this study, Brienomyrus brachyistius from the Oluwa River was studied to enhance the understanding of the karyotype organization in the Mormyridae. Metaphase chromosomes were processed from the fish kidney following a conventional cytogenetic procedure; the fish was subjected to an intra-peritoneal colchicine injection at the rate of 1ml per 100g of fish mass. Hypotonic treatment was in 0.56% KCl solution, and cells fixation and washes were in 3: 1 methanol: acetic acid. The slides were stained with Giemsa solution, while the constitutive heterochromatin was revealed from the previous Giemsa stained slide using the C-banding sequential method. Capturing of metaphase images was done with an Olympus BX50 microscope. The karyotype of 2n = 50 (50sta) obtained in the species was the first mormyrid karyotype composed of 2n = 50 acrocentrics, supporting the proposed ancestral karyotype for the Mormyridae.

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Section: Metaphase Chromosomes Preparationmentioning

confidence: 99%

Karyotype of the Mormyrid Baby Whale Fish (Osteoglossiformes: Mormyridae): Brienomyrus Brachyistius in Oluwa River, Nigeria

2022

JBAH

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“…The African weakly electric mormyrids comprise more than 200 species in 21 genera (Alves-Gomes and Hopkins 1997 ; Ozouf-Costaz et al 2015 ; Sullivan and Lavoué 2015 ; Nelson et al 2016 ). Their electric organ discharge (EOD) is species specific and shows a high diversity across the species (see e.g., Hopkins 1981 ; Hopkins and Bass 1981 ; Lamanna et al 2016 ).…”

Section: Introductionmentioning

confidence: 99%

Intergenus F1-hybrids of African weakly electric fish (Mormyridae: Gnathonemus petersii ♂ × Campylomormyrus compressirostris ♀) are fertile

et al. 2022

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Hybridisation is an important element of adaptive radiation in fish but data are limited in weakly electric mormyrid fish in this respect. Recently, it has been shown that intragenus hybrids (Campylomormyrus) are fertile and are able to produce F2-fish. In this paper, we demonstrate that even intergenus hybrids (Gnathonemus petersii ♂ × Campylomormyrus compressirostris ♀) are fertile. Three artificial reproduction (AR) trials, with an average fertilisation rate of ca. 23%, yielded different numbers of survivals (maximally about 50%) of the F1-hybrids. The complete ontogenetic development of these hybrids is described concerning their morphology and electric organ discharge (EOD). Two EOD types emerged at the juvenile stage, which did not change up to adulthood. Type I consisted of four phases and Type II was triphasic. The minimum body length at sexual maturity was between 10 and 11 cm. Malformations, growth and mortality rates are also described.

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Similarity of Karyotype Structure in Three Mormyrus Species (Mormyridae) from the White Nile and Omo River Tributaries (Ethiopia)

et al. 2021

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First insights into karyotype evolution within the family Mormyridae

Cited by 4 publications

References 20 publications

Karyotype of the Mormyrid Baby Whale Fish (Osteoglossiformes: Mormyridae): Brienomyrus Brachyistius in Oluwa River, Nigeria

Karyotype of the Mormyrid Baby Whale Fish (Osteoglossiformes: Mormyridae): Brienomyrus Brachyistius in Oluwa River, Nigeria

Intergenus F1-hybrids of African weakly electric fish (Mormyridae: Gnathonemus petersii ♂ × Campylomormyrus compressirostris ♀) are fertile

Similarity of Karyotype Structure in Three Mormyrus Species (Mormyridae) from the White Nile and Omo River Tributaries (Ethiopia)

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