Onychostoma barbatulum and O. alticorpus, two primarily freshwater cyprinid fish, have similar morphological characters and partially overlapping ecological habitats. In order to explore the genetic differences between these two species, chromosomal characteristics and genetic variations were examined by fluorescence in situ hybridization (FISH) of 5S rDNA and cytochrome (Cyt) b gene analysis. ...

This study evaluated whether the African cyprinid Barbus neumayeri from Rwembaita Swamp (low-oxygen) and Njuguta River (high-oxygen) in the Kibale National Park, Uganda differed in traits related to aerobic and anaerobic metabolic potential. Haematocrit was measured as an index of blood oxygen-carrying capacity, and tissue activities and isozyme composition of lactate dehydrogenase (LDH) were m...

Abstract Background Postzygote isolation is an important part of species isolation, especially for fish, and it can be divided into two aspects: genetic ecological isolation. With the increase in parental distance, intensity between them also increases. Will niche differences lead to them? This question difficult answer based on current literature due lack hybridization cases contrasting parent...