MORPHOLOGICAL PECULIARITIES OF THE STONE MOROKO (PSEUDORASBORA PARVA) FROM COLDWATER ZONE OF THE CHIRCHIK RIVER BASSIN IN UZBEKISTAN

Abstract

In 2022, the morphological features of stone moroko (Pseudorasbora parva) in the canals of Tashkent was studied. The place can be attributed to the cold-water zone of the Chirchik river basin. This invasive species was once accidentally entered to fish ponds in the lower reaches of the Chirchik River in the 1960s, adopted to local environments and spread widely throughout the republic. Traditionally, it is considered as a warm-water species, however, it has settled in the lower part of the cold-water zone. For stone moroko, the formula of the rays of the dorsal fin is defined as D III 7 (8), the formula of the rays of the anal fin is A II 6 in the channels of Tashkent. In the lateral line there are 33 – 37 (average 35) scales. The plastic features of the fish of the studied stock are given