![]() Originating in the inland waters of the Amazon River basin in Brazil and Peru, the Porthole Catfish is mainly found in slow moving creeks, tributaries, floodplain lakes, and ponds. Their bodies are sleek, featuring long-sloping heads with pronounced barbels protruding from their mouths. A row of dark spots run along this unique catfish's lateral line, resembling 'portholes' on a ship. This fact was also evidenced when using other banding techniques, such as RE (AluI), and indicates that this pair constitutes a species-specific cytogenetic marker. The Porthole Catfish is a peaceful and easy-to-keep beauty for your Amazon community aquarium. C-banding revealed a small amount of heterochromatin in chromosomes, including the NORs, and one biarmed pair that showed conspicuous positive bands on both arms. Originating in the inland waters of the Amazon River basin in Brazil and Peru, the Porthole Catfish is mainly found in slow moving creeks, tributaries, floodplain lakes, and ponds. NORs detected by AgNO₃ were located in the terminal regions of the short arm of a st chromosome pair, as confirmed by CMA₃ and FISH using an 18S rDNA probe. The karyotype shows a diploid number of 2n=56 chromosomes comprising 22m, 16sm, 10st, 8a (FN=104). In this work, Hemisorubim platyrhynchos from three isolated populations were cytogenetically analyzed. 103-110 ISSN: 1993-078X Subject: Hemisorubim platyrhynchos, Neotropics, catfish, chromosome banding, diploidy, fisheries, heterochromatin, karyotyping, rivers Abstract: Hemisorubim platyrhynchos is a medium- to large-sized pimelodid catfish distributed along several river basins of the Neotropical Region, noteworthy for representing an important fishery source. Of these genera, Hemisorubim is most closely related to Pseudoplatystoma. This genus forms a monophyletic group with Sorubim, Sorubimichthys, Pseudoplatystoma, and Zungaro. Hemisorubim platyrhynchos (Valenciennes, 1840), popularly called jurupoca or porthole shovelnose catfish, is a pimelodid fish inhabiting the deeper and slow-moving sections of large South American rivers (Burgess 1989, Froese and Pauly 2012).This species is the sixth largest pimelodid of the Pantanal region/Brazil (Penha et al. Cytogenetics of the Porthole Shovelnose Catfish, Hemisorubim platyrhynchos (Valenciennes, 1840) (Siluriformes, Pimelodidae), a widespread species in South American rivers Author: Ana Cláudia Swarça, Sebastian Sanchez, Ana Lucia Dias, Alberto Sergio Fenocchio Source: Comparative cytogenetics 2013 v.7 no.2 pp. This fish is considered one of the 'sorubimine' catfishes, an informal group of catfish that includes genera such as Sorubim, Pseudoplatystoma, and Brachyplatystoma.
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