A river is an ecosystem where fish fauna represents important structural element. To re-establish connectivity, it imperative to allow movement between functional habitats. Due the hydromorphological complexity of large anthropized rivers and lack study techniques that can be used in such environments, relevant data with regard ecology are scarce. On River Meuse, Belgium, at a point 323 km upst...

Diet of adult pikeperch Sander lucioperca, Eurasian perch Perca fluviatilis, northern pike Esox lucius and European catfish Silurus glanis as top predators in aquatic ecosystems in Serbia was investigated during 2011, in order to understand their relationship to their prey and to investigate their food consumption, feeding and assimilation rate, cannibalism, and habitat segregation. Northern pi...

In the literature about the respiratory physiology of water-breathers, the arterial partial pressure of oxygen, P&o2, is reported to range from about 2 to 10-13 kPa (Shelton etal. 1986; McMahon and Wilkens, 1983). In fish, Shelton etal. (1986) reported that animals with low blood O2-affinity exhibit high P a ^ and vice versa. But in laboratory conditions, the excitation state of the animals may...