Karyotypes of three species of marine catfishes from Brazil

Gomes, Vicente; Phan, Van Ngan; Passos, Maria José de Arruda Campos Rocha

doi:10.1590/s0373-55241994000100004

Cited by 6 publications

(4 citation statements)

References 11 publications

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“…mapale has 2n = 52 (14M+20SM+18ST – Figure 2a ), and Sciades herzbergii has 2n = 56 (14M+20SM+18ST+4A - Figure 2b ). Early karyotypic studies of G. barbus by Gomes et al (1994 , cited as Netuma barba ) and S. herzbergii by Molina et al (2004 , cited as Hexanematichthys herzbergii ) showed the same diploid numbers found in the present study. However, the karyotypic formulae previously described for these species were different from those found here ( Table 1 ).…”

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confidence: 86%

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Cytogenetic analysis of three sea catfish species (Teleostei, Siluriformes, Ariidae) with the first report of Ag-NOR in this fish family

Nirchio¹,

Martinez

Foresti

et al. 2010

Genet. Mol. Biol.

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Despite their ecological and economical importance, fishes of the family Ariidae are still genetically and cytogenetically poorly studied. Among the 133 known species of ariids, only eight have been karyotyped. Cytogenetic analyses performed on Genidens barbus and Sciades herzbergii revealed that both species have 2n = 56 chromosomes and Cathorops aff. mapale has 2n = 52 chromosomes: Genidens barbus has 10 Metacentrics (M), 14 Submetacentrics (SM), 26 Subtelocentrics (ST), and 6 Acrocentrics (A), Sciades herzbergii has 14M, 20SM, 18ST and 4A, whereas Cathorops aff. mapale has 14M, 20SM, and 18ST. The nucleolus organizer regions (NORs) were found in a single chromosome pair on the short arm of a large-sized ST pair in Genidens barbus and on the short arm of a middle-size SM pair in Cathorops aff. mapale. Multiple NORs on the short arms of two large-sized ST pairs were found in Sciades herzbergii. The occurrence of diploid numbers ranging from 2n = 52 through 56 chromosomes and the presence of different karyotypic compositions, besides the number and position of NORs suggest that several numeric and structural chromosome rearrangements were fixed during the evolutionary history of this fish family.

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confidence: 86%

“…This difference in diploid numbers between species of a single genus was also found in Bagre ( Fitzsimons et al , 1988 ; Gomes et al , 1990 ) ( Table 1 ), suggesting that this is not a rare phenomenon among ariids. On the other hand, the two Genidens species analyzed ( Gomes et al , 1994 ) presented the same diploid number ( Table 1 ).…”

mentioning

confidence: 87%

Cytogenetic analysis of three sea catfish species (Teleostei, Siluriformes, Ariidae) with the first report of Ag-NOR in this fish family

Nirchio¹,

Martinez

Foresti

et al. 2010

Genet. Mol. Biol.

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“…Among the individuals belonging to the two species, there are clear differences on their occipital processes and predorsal plates, on the shape of their premaxillary and palatine bones and on their vomerine teeth disposition, all diagnostic features for marine catfishes (Marceniuk & Menezes ) and, although the karyotype of both species show 56 chromosomes, they are structurally different and only G. barbus individuals carry sexual chromosomes (Gomes et al . ; Sczepanski et al . ).…”

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confidence: 99%

DNA barcodes identify marine fishes of São Paulo State, Brazil

Ribeiro

Caires

Mariguela

et al. 2012

Molecular Ecology Resources

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Anthropogenic impacts are an increasing threat to the diversity of fishes, especially in areas around large urban centres, and many effective conservation actions depend on accurate species identification. Considering the utility of DNA barcoding as a global system for species identification and discovery, this study aims to assemble a DNA barcode reference sequence library for marine fishes from the coastal region of São Paulo State, Brazil. The standard 652 bp 'barcode' fragment of the cytochrome c oxidase subunit I (COI) gene was PCR amplified and bidirectionally sequenced from 678 individuals belonging to 135 species. A neighbour-joining analysis revealed that this approach can unambiguously discriminate 97% of the species surveyed. Most species exhibited low intraspecific genetic distances (0.31%), about 43-fold less than the distance among species within a genus. Four species showed higher intraspecific divergences ranging from 2.2% to 7.6%, suggesting overlooked diversity. Notably, just one species-pair exhibited barcode divergences of <1%. This library is a first step to better know the molecular diversity of marine fish species from São Paulo, providing a basis for further studies of this fauna - extending the ability to identify these species from all life stages and even fragmentary remains, setting the stage for a better understanding of interactions among species, calibrating the estimations about species composition and richness in an ecosystem, and providing tools for authenticating bioproducts and monitoring illegal species exploitation.

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“…Most marine fishes studied have a diploid complement of 48 acrocentric chromosomes (Sola et al 1981, Klinkhardt et al 1995. However, in some taxa, close species have been reported showing changes in chromosome number and formula (Yokoyama et al 1992, Caputo et al 1997, Corrêa and Galetti 1997 and different sex chromosome systems (Brum et al 1992, Morescalchi et al 1992, Gomes et al 1994.…”

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confidence: 99%

First Cytogenetic Study of the Whitecheek Monocle Bream, <i>Scolopsis vosmeri</i> (Perciformes, Nemipteridae) from Thailand

et al. 2017

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The first chromosome analysis of the whitecheek monocle bream (Scolopsis vosmeri Bloch, 1792) from the Gulf of Thailand, was studied. Kidney cell samples were taken from two male and two female fish. The mitotic chromosome preparations were done directly from kidney cells. Conventional and Ag-NOR staining techniques were applied to stain the chromosomes. The results showed that the diploid chromosome number of S. vosmeri was 2n= 48, the fundamental numbers (NF) were 50 in both male and female. The types of chromosomes were 2 large acrocentric, 30 large telocentric, 14 medium telocentric, and 2 small telocentric chromosomes. The Ag-NOR banding indicated that a single pair of NORs was observed on the short arm subtelomeric region of the largest acrocentric chromosome pair 1. The karyotype formula could be deduced as: a t t t 2 30 14 2

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Karyotypes of three species of marine catfishes from Brazil

Cited by 6 publications

References 11 publications

Cytogenetic analysis of three sea catfish species (Teleostei, Siluriformes, Ariidae) with the first report of Ag-NOR in this fish family

Cytogenetic analysis of three sea catfish species (Teleostei, Siluriformes, Ariidae) with the first report of Ag-NOR in this fish family

DNA barcodes identify marine fishes of São Paulo State, Brazil

First Cytogenetic Study of the Whitecheek Monocle Bream, <i>Scolopsis vosmeri</i> (Perciformes, Nemipteridae) from Thailand

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