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Chromosomal studies on color variants of Asian arowana Scleropages formosus (Teleostei, Osteoglossiformes)

Grant number: 18/14677-6
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): November 01, 2018
Field of knowledge:Biological Sciences - Genetics - Animal Genetics
Principal researcher:Marcelo de Bello Cioffi
Grantee:Gustavo Akira Toma
Home Institution: Centro de Ciências Biológicas e da Saúde (CCBS). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
Associated scholarship(s):21/13180-3 - Satellitome analysis and Chromosome Painting in the color variants of S. formosus and in the other two Scleropages species (Teleostei, Osteoglossiformes), BE.EP.IC


The species Scleropages formosus (Asian arowana) is one of the most expensive ornamental fish species in the market and, due to this fact; it has been widely exploited in its natural habitats being now listed as one of the species with one of the highest risk of extinction. However, little information is known about its genome organization. Unlike the other arowana species already described, the Asian Arowana has at least five naturally known color variants. They all appear to have originated from different regions of Southeast Asia, probably connected by freshwater habitats during the Pleistocene ice ages. However, the taxonomic nature of these variant forms is not yet fully understood and there are doubts as to the status of these variants as representative of one or several species. Thus, this project intends to analyze 05 color variants (Green, Silver, Gold Crossback, High back Golden and Super Red) of the species S. formosus using conventional (Giemsa staining and C-banding) and molecular cytogenetics [ rDNA, Microsatellites, Comparative Genomic Hybridization (CGH) and Chromosome Painting (WCP)] experiments in order to verify whether there is a differentiation between them at the chromosome level that supports the separation of these variants into distinct species.

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
YANO, CASSIA FERNANDA; SEMBER, ALEXANDR; KRETSCHMER, RAFAEL; CARLOS BERTOLLO, LUIZ ANTONIO; EZAZ, TARIQ; HATANAKA, TERUMI; LIEHR, THOMAS; RAB, PETR; AL-RIKABI, AHMED; VIANA, PATRIK FERREIRA; et al. Against the mainstream: exceptional evolutionary stability of ZW sex chromosomes across the fish families Triportheidae and Gasteropelecidae (Teleostei: Characiformes). Chromosome Research, v. 29, n. 3-4, . (19/04877-0, 20/11669-2, 20/11772-8, 18/14677-6)

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