New records of the occurrence of Megaleporinus macrocephalus () (Characiformes, Anostomidae) from the basins of the Itapecuru and Mearim rivers in Maranhão, Northeastern Brazil

Almeida, Marcius S.; Moraes, P. S. S.; Nascimento, Maria Histelle Sousa do; Birindelli, José L. O.; Assega, Fernando Massayuki; Barros, Maria Claudene; Fraga, Elmary da Costa

doi:10.1590/1519-6984.232868

Cited by 4 publications

(1 citation statement)

References 27 publications

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“…Both Colossoma macropomum (Cuvier, 1816), which is amply distributed in the Amazon-Orinoco basin, and Megaleporinus macrocephalus (Garavello & Britski, 1988), which is found widely in the Paraguay River, were identified in the Mearim River. These non-native species have enormous potential for aquaculture, and haver been introduced into many Brazilian river basins (Godinho and Godinho, 2003;Barbosa and Soares, 2009;Barbosa et al, 2017;Almeida et al, 2021), including those surveyed in the present study, where they are raised on fish farms. While Cichla sp.…”

Section: Discussionmentioning

confidence: 97%

Fish diversity in the rivers that drain the Baixada Maranhense and the Mearim basin in northeastern Brazil

Limeira-Filho,

Moraes,

Almeida

et al. 2023

Braz. J. Biol.

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The Baixada Maranhense Environmental Protection Area of the Brazilian state of Maranhão encompasses a biologically rich region that includes the basins of four principal rivers, the Mearim, Pericumã, Pindaré, and Turiaçu, which form a complex of wetlands. The present study provides a comprehensive inventory of the fish fauna of the rivers that drain the Baixada Maranhense based on the identification of voucher specimens that were deposited in a scientific collection. Expeditions were conducted between 2014 and 2020. The inventory identified a total of 100 fish species representing 79 genera, 34 families, and 11 orders, which are found in both freshwater and estuarine environments. Six (Potamotrygon orbignyi, Leporinus piau, Moenkhausia loweae, Serrasalmus spilopleura, Pachypops fourcroi and Peckoltia greedoi) of the 100 taxa identified here are considered to be new records for one or more of the basins surveyed during this study, based on the existing data, while four – Colossoma macropomum, Megaleporinus macrocephalus, Cichla sp. and Cichla kelberi – are not native. The most speciose orders were the Siluriformes and Characiformes, while the most diverse families were the Loricariidae, Characidae, Auchenipteridae, Cichlidae, and Serrasalmidae. These data are consistent with the findings of most of the previous studies of freshwater ecosystems in the Neotropical region, in particular those of the rivers of Maranhão. The results of the present study represent an important advance in the understanding of the diversity of the fish fauna of the Mearim, Pericumã, Pindaré, and Turiaçu rivers, which are still poorly studied, and have likely had their diversity underestimated up to now.

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Section: Discussionmentioning

confidence: 97%

Fish diversity in the rivers that drain the Baixada Maranhense and the Mearim basin in northeastern Brazil

Limeira-Filho,

Moraes,

Almeida

et al. 2023

Braz. J. Biol.

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Multiple stressors influencing the general eutrophication status of transitional waters of the Brazilian tropical coast: An approach utilizing the pressure, state, and response (PSR) framework

Sá

Cutrim

Feitosa

et al. 2022

Journal of Sea Research

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De novo assembly and characterization of a highly degenerated ZW sex chromosome in the fish Megaleporinus macrocephalus

Souza-Borges,

Utsunomia,

Varani

et al. 2024

GigaScience

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Background Megaleporinus macrocephalus (piauçu) is a Neotropical fish within Characoidei that presents a well-established heteromorphic ZZ/ZW sex determination system and thus constitutes a good model for studying W and Z chromosomes in fishes. We used PacBio reads and Hi-C to assemble a chromosome-level reference genome for M. macrocephalus. We generated family segregation information to construct a genetic map, pool sequencing of males and females to characterize its sex system, and RNA sequencing to highlight candidate genes of M. macrocephalus sex determination. Results The reference genome of M. macrocephalus is 1,282,030,339 bp in length and has a contig and scaffold N50 of 5.0 Mb and 45.03 Mb, respectively. In the sex chromosome, based on patterns of recombination suppression, coverage, FST, and sex-specific SNPs, we distinguished a putative W-specific region that is highly differentiated, a region where Z and W still share some similarities and is undergoing degeneration, and the PAR. The sex chromosome gene repertoire includes genes from the TGF-β family (amhr2, bmp7) and the Wnt/β-catenin pathway (wnt4, wnt7a), some of which are differentially expressed. Conclusions The chromosome-level genome of piauçu exhibits high quality, establishing a valuable resource for advancing research within the group. Our discoveries offer insights into the evolutionary dynamics of Z and W sex chromosomes in fish, emphasizing ongoing degenerative processes and indicating complex interactions between Z and W sequences in specific genomic regions. Notably, amhr2 and bmp7 are potential candidate genes for sex determination in M. macrocephalus.

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New records of the occurrence of Megaleporinus macrocephalus () (Characiformes, Anostomidae) from the basins of the Itapecuru and Mearim rivers in Maranhão, Northeastern Brazil

Cited by 4 publications

References 27 publications

Fish diversity in the rivers that drain the Baixada Maranhense and the Mearim basin in northeastern Brazil

Fish diversity in the rivers that drain the Baixada Maranhense and the Mearim basin in northeastern Brazil

Multiple stressors influencing the general eutrophication status of transitional waters of the Brazilian tropical coast: An approach utilizing the pressure, state, and response (PSR) framework

De novo assembly and characterization of a highly degenerated ZW sex chromosome in the fish Megaleporinus macrocephalus

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