BACKGROUND Brominated flame retardants (BFRs)--polybrominated diphenyl ethers (PBDEs) and hexabromocyclododecane (HBCD)--belong to the group of relatively "new" environmental contaminants. The occurrence of these compounds in the Czech aquatic ecosystem was for the first time documented within the 3-year monitoring study initiated in 2001. In 2002-2003 HBCD and the major PBDE congeners (28, 47,...

Species integrity can be challenged, and even eroded, if closely related species can hybridize and produce fertile offspring of comparable fitness to that of parental species. The maintenance of newly diverged or closely related species therefore hinges on the establishment and effectiveness of pre- and/or post-zygotic reproductive barriers. Ecological selection, including predation, is often p...

Abstract The aim of this study was to compare the susceptibility body deformities in juveniles 13 common European cypriniform fish, caused by intensive feeding with same commercial dry diet administered at 25°C according a similar schedule. final share individuals malformations differed considerably among species and 0.0-87.0%. Unaffected were only Barbus barbus (L.), Chondrostoma nasus Cyprinu...

The present study tried to investigate the effects of probiotic, Pediococcus acidilactici in concentrations of 1× 109, 2× 109 and 3×109cfu kg-1 diet on growth and survival rate of oriental bream fry (Abramis brama orientalis, Berg 1949) in comparison to control diet (devoid of probiotic) for 60 days. In so doing, 180 specimens of oriental bream with initial weight of 2.69&plus...

the present study tried to investigate the effects of probiotic, pediococcus acidilactici in concentrations of 1× 109, 2× 109 and 3×109cfu kg-1 diet on growth and survival rate of oriental bream fry (abramis brama orientalis, berg 1949) in comparison to control diet (devoid of probiotic) for 60 days. in so doing, 180 specimens of oriental bream with initial weight of 2.69± 0.22 g were divided r...

The ichthyological biodiversity of Polish lakes is poorly understood, even in not used for fishing and those under strict protection. With this mind, the aim study was to conduct a comprehensive survey several Wolin National Park (Poland). conducted Domysławskie Gardno anthropogenic Stara Kredownia reservoir. Each exercise using benthic nets over 12 h period. fish caught were measured weighed, ...

Due to the increasing resistance of aquaculture pathogens antibiotics, search for new approaches control infectious diseases is particular importance. A promising approach development probiotic preparations based on antagonist bacteria. The paper studied antagonistic activity Bacillus strains that are developing probiotics fish. were isolated from bottom sediments Don River in area Donskoy Fish...