Hoplias malabaricus (Bloch, 1794) is a carnivorous fish species widely distributed from northern to southern South America. This taxon is believed to be a good model for the investigation of biogeographic events that shape the ichthyofauna evolution in the Neotropical freshwater systems. However, many studies have revealed that H. malabaricus hides a species complex that hampers its taxonomic identity and limit its practical value for evolutionary and biogeographic studies. In this paper, we used the mitochondrial gene cytochrome c oxidase subunit I (COI) to delimit cryptic species and explore the phylogeography of H. malabaricus sensu stricto. We found genetic evidence for putative new species in the genus Hoplias and showed that H. malabaricus (Bloch, 1794) is a major clade assigned to barcode index number (BIN) BOLD:ABZ3047. This species is structured in six subpopulations differentiated by high Fst values and restricts gene flow. The subpopulations of the São Francisco/East Atlantic/Eastern Northeast Atlantic/Parnaíba/Itapecuru River basins and Tapajós River Basin were the most differentiated and showed demographic fluctuations. The present distributional pattern is most likely explained through a scenario from the Pleistocene.
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http://dx.doi.org/10.1038/s41598-022-09121-z | DOI Listing |
Microorganisms
November 2024
Department of Preventive Veterinary Medicine, Veterinary School, Federal University of Minas Gerais, Belo Horizonte 31270-901, Brazil.
is an important pathogen responsible for cases of high mortality in farmed and wild fish worldwide. In Brazil, this bacterium has been commonly associated with outbreaks in Nile tilapia farms, but other native fish species are also susceptible. Since floating cages are one of the most common culture systems used in the country, the close contact between farmed tilapia and native fish species presents a risk concerning the transmission of this pathogen.
View Article and Find Full Text PDFPLoS One
December 2024
Escuela de Ciencias Químicas, Pontificia Universidad Católica del Ecuador, Quito, Ecuador.
One of the most toxic metals is mercury, which exhibits high toxicity during short exposure periods. This study aimed to determine the concentration of total mercury (THg) in fish muscle tissue from various species captured from two locations in the middle basin of the Pastaza River in Ecuador, which the locals use in their weekly diet. The individuals captured belong to the following families: Loricariidae, Cetopsidae, Heptapteridae, Cichlidae, Parodontidae, Characidae, Prochilodontidae, Curimatida, Siluriformes, Cichliformes, Characiformes, Erythrinidae and Curimatidae.
View Article and Find Full Text PDFJ Fish Dis
January 2025
Department of Animal Biology, Institute of Biology, University of Campinas-UNICAMP, Campinas, SP, Brazil.
Histopathological studies of parasitic infections in fish from the natural environment of Brazilian Amazon, are quite scarce. In this study, we investigated the histopathological changes of the proximal intestine of specimens of the Amazonian fish Hoplias malabaricus infected by the hematophagous nematode Procamallanus (Spirocamallanus) paraensis. The prevalence of the infection was 60%, with an average abundance of 1.
View Article and Find Full Text PDFActa Parasitol
December 2024
Universidade Federal do Amapá (UNIFAP), Programa de Pós-Graduação em Diversidade Tropical (PPGBio), Rodovia Josmar Chaves Pinto, s/n, Universidade, Macapá, AP, 68903-419, Brazil.
Introduction: Anacanthorus silvoi n. sp. (Dactylogyridae, Anacanthorinae) is described from the gills of Hoplias aff.
View Article and Find Full Text PDFSci Rep
September 2024
Departamento de Genética e Evolução, Universidade Federal de São Carlos, São Carlos, SP, 13565-905, Brazil.
Multiple sex chromosomes usually arise from chromosomal rearrangements which involve ancestral sex chromosomes. There is a fundamental condition to be met for their long-term fixation: the meiosis must function, leading to the stability of the emerged system, mainly concerning the segregation of the sex multivalent. Here, we sought to analyze the degree of differentiation and meiotic pairing properties in the selected fish multiple sex chromosome system present in the wolf-fish Hoplias malabaricus (HMA).
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