Detection of Squalius cephalus (Linnaeus, 1758), Carassius carassius (Linnaeus, 1758) and the khromist of Rutilus rutilus (Linnaeus, 1758) in the lower reaches of the Dnipro river in recent years

The article presents the materials on the detection of two very rare species of fish: the European chub Squalius cephalus (Linnaeus, 1758) and the crucian carp (the golden carp) Carassius carassius (Linnaeus, 1758) in the waters of the lower estuary of the Dnipro river in recent years. C. carassius is listed in the Red Book of Ukraine (2009). The article also describes the first encounter in these waters with the khromist of the common roach Rutilus rutilus (Linnaeus, 1758), which has a yellow-golden colour of the whole body. The basin of the Lower Dnipro includes the Kakhovske reservoir, the Ingulets river, several small tributaries and the lower unregulated part of the Dnipro riverbed along with the straits. Over the entire period of observation, up to 72 species of the round-mouthed fish and the fish from 59 genera and 19 families have been spotted in the fish fauna of the Lower Dnipro basin. According to some data, it is stated that within the migratory and freshwater species of the round-mouthed fish and the fish of the Lower Dnipro's ichthyocenosis only 21 out of 47 species of the native fish fauna have survived here. In general, the current fish fauna of the unregulated part of the Lower Dnipro amounts to 51 species of fish. The habitat of 28 species of fish in the lower estuary of the Dnipro river was confirmed in 2019.