A5016372584- Fish Ecology and Management Studies
- Environmental and Biological Research in Conflict Zones
- Aquatic Invertebrate Ecology and Behavior
- Fish Biology and Ecology Studies
- Water Quality and Pollution Assessment
- Environmental Science and Water Management
The study focused on sampling procedures and analysis of biological physico-chemical quality elements (according to the EU Water Framework Directive (WFD)) aimed at defining reference conditions sites, maximum ecological potential, specific hydromorphological for assessed surface water types “rivers” “lakes” categories. Biological (BQE) their metrics were selected in compliance with WFD requirements its additional guidelines. All five compulsory BQEs surveyed (phytoplankton, macrophyte...
An index has been elaborated to define the ecological status of rivers in Bulgaria, using fish as indicator for human impact. The is based on classical approach biological integrity, employing nine biotic variables and more than 70 freshwater species. main purpose intended determine Bulgarian according requirements EU Water Framework Directive. method fast, simplified adapted fishing methods that do not require colecting specimens. advantages are BRI especially its sensitivity directed...
The downstream migration of young-of-the-year (YoY) four sturgeon species (Acipenser ruthenus, A. stellatus, gueldenstaedtii and Huso huso) was monitored in the Danube at river km 396 8 continuous years (2014–2021). A total 713 YoY specimens were registered for whole period. most frequent migrant on an annual basis observed 6 out years. abundant young sturgeons during first ruthenus with 599 specimens, followed by stellatus. For H. huso, only 7 entire natural hybrids × stellatus quite...
All sturgeon species currently living in the Danube River are either critically endangered or at edge of extinction. Sturgeons mainly benthic feeders, with a diet molluscs, crustaceans, and small fishes. During last two decades, we have seen significant change composition invertebrates as result anthropogenic impacts – hydrological habitat modifications, introduction alien invasive species. The aim this study was to investigate food importance different prey taxa, describe feeding strategies...