Density of the Fish Population in River Channel Partsof the Ivankovo Reservoir in 2012–2015
The density of some species and total density of fishes have been estimated in channel parts of the Ivankovo reservoir in 2012–2015. The significant differences in the total abundance of fishes in 2012–2013 and 2014–2015 have been found. The increase in the number of the Black Sea (Clupeonellacultriventris (Nordmann, 1840)) sprat in the 2014–2015 was associated with biological features of the species, namely, with its short life cycle. Changes in the abundance of bream and white bream in the pelagial of the reservoir are caused by their vertical redistribution under effect of environment factors.