![porthole catfish porthole catfish](https://i.ytimg.com/vi/pnjTZEgoGZ4/maxresdefault.jpg)
The objective of the present study was to describe the karyotypic structure of specimens from three populations of Hemisorubim platyrhynchos aiming to characterize andcompare the obtained results with the available cytogenetic data on this and other related species.įifteen specimens of Hemisorubim platyrhynchos consisting of 8 males (m) and 5 females (f), caught in the Parana River (Corrientes State, Argentina) and 2 specimens of undetermined sex from the Miranda River (Mato Grosso do Sul State, Brazil) were cytogenetically analyzed. Until now only one population of Hemisorubim platyrhynchos of the Parana River (Brazil) has been cytogenetically studied and has had its diploid number, AgNORs location and C-banding reported ( Martins-Santos et al. Hemisorubim platyrhynchos is a monotypic species that belongs to the family Pimelodidae, however, it is considered one of the “sorubimine catfishes”, an informal group of catfish that comprises other genera such as Sorubim Cuvier, 1829, Pseudoplatystoma Bleeker, 1862, and Brachyplatystoma Bleeker, 1862 ( Lundberg and Akama 2005).
![porthole catfish porthole catfish](https://i.ytimg.com/vi/SBBFjK27KgA/maxresdefault.jpg)
Calophysus Müller and Troschel in Müller 1843, Pimelodus LaCépède, 1803 and “ Sorubiminae” ( de Pinna 1998).įrom a cytogenetic point of view some reports show that these groups could also share cytogenetic characteristics, supporting additionally the classification above mentioned ( Swarça et al. Some authors has been divided this family in “groups” i.e. The family Pimelodidae represents one of the most specious catfish groups, however relationships among species of this group still remain as unanswered questions however, it seems self-evident that they share certain characteristics (Nelson 2006, Ferraris 2007). The extensive exploitation of its populations due to overfishing could affect its genetic variability, which is still poorly known. Breeding and sexing information have not been reported. It feeds on benthic organisms and fish ( Froese and Pauly 2012). Its body shape and color pattern are adapted to the muddy bottom where it stays. 2004) and is considered an important species in the fisheries of the Paraná River basin ( Agostinho et al. This species is the sixth largest pimelodid of the Pantanal region/Brazil ( Penha et al. 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).