One of the most efficient mechanisms to keep animal lineages separate is a difference in ploidy level (number of whole genome copies), since hybrid offspring from parents with different ploidy level are functionally sterile. In the freshwater fish family Botiidae, ploidy difference has been held responsible for the separation of its two subfamilies, the evolutionary tetraploid Botiinae and the ...

The stomach, which is characterized by acid peptic digestion in vertebrates, has been lost secondarily multiple times in the evolution of the teleost fishes. The Cypriniformes are largely seen as an agastric order; however, within the superfamily Cobitoidea, the closely related sister groups Nemacheilidae and Balitoridae have been identified as gastric families. The presence of these most recen...

We present a phylogenetic investigation of the Northern Clade, the major monophyletic clade within the freshwater fish family Cobitidae, one of the most prominent families of freshwater fishes found in Asian and European waters. Phylogenetic reconstructions based on the cytochrome b and RAG-1 genes show the genera Microcobitis, Sabanejewia, Koreocobitis and Kichulchoia as monophyletic groups. T...

In dojo loach (<i>Misgurnus anguillicaudatus</i>), although most wild types are gonochoristic diploids that genetically differentiated into 2 groups, A and B, clonal lineages appear in certain localities. Clonal loaches have been considered to hybrid origins between the groups by a series of genetic studies. this study, using FISH with newly developed probe (ManDra-A), we identified...

This is the first study concerning the features of the reproduction process of the karyologically identified spined loach C. taenia (2n=48). The histology of 71 ovaries, and gonadosomatic index (GSI) of karyologically identified spined loach Cobitis taenia L. from Lake Klawój (Northern Poland) were examined. The absolute and relative fecundity of 25 females was estimated by gravimetric method. ...

The present study revealed that a total of 101 indigenous species large fish (28 species) and Small Indigenous (73 belonging to 63 genera 31 families were observed identified while 17 exotic found under 5 families. Among the species, highest number in family Cyprinidae Bagridae with relative diversity 28.28% 11.11%. In case group richness, 27 catfish followed by 12 carp, 8 each barbs minnows, 6...