Length-weight relationships (LWRs) are useful for calculating weight based on measurements of length. Here we provide LWRs 17 species fish from the rivers Vltava and Elbe in Czech Republic, Central Europe. The samples were collected by electrofishing May 2016 to August 2019. There far fewer riverine than lotic fish. All significant with r2 values ranging 0.99 European barbel (Barbus barbus) 0.9...

Abstract Biological invasion is a strong threat to native biodiversity, with limnic systems being especially vulnerable due historical separation and resulting prey naivety. The naivety hypothesis states that species may not be able recognize novel predators lack of common evolutionary background and, therefore, become easy targets. In laboratory experiment, we added cues European bullhead ( Co...

Abstract The recent expansion of the round goby ( Neogobius melanostomus ) in tributaries lower Danube (Bulgaria) prompted assessing potential negative effects on local fish fauna such as competition for food resources. Diet overlap between and native fishes was analyzed using samples macroinvertebrates collected monthly a one-year period. Significant dietary N. Barbus petenyi , Perca fluviatil...

Occurrence and distribution of larval and juvenile fish was investigated in nearshore waters of the southeastern Caspian Sea including the Gorgan Bay. Samples were collected during seven surveys using a fine mesh beach-seine in five sampling sites from July 2014 to June 2015. A total of 15500 individuals mostly juvenile were captured, representing 18 species from 8 families. Most juveniles belo...