Abstract
The study provides information on the modern distribution of a species alien to the ichthyofauna of Republic of Dagestan, topmouth gudgeon Pseudorasbora parva (Temminck et Schlegel, 1846) (Cyprinidae). It has been established that this species is found in the rivers Manasozen, Gamriozen, Ulluchay, Rubas, Avar Koisu (a tributary of the Sulak River, in the area of the Gotsatlinskaya HPP), as well as in Lake Mochokh. The wide distribution of P. parva is associated with ecological plasticity, migratory activity, high growth rate, accelerated puberty and high level of survival of the offspring of this species of fish.
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