Morphological Features Of The Tashkent Riffle Bleak Alburnus Oblongus (Teleostei: Leuciscidae) In Chirchik River, Uzbekistan

Abstract

 In 2022, the morphological features of the Tashkent riffle bleak (Alburnus oblongus) from the upper stream of the Chirchik River (Uzbekistan) were studied. The previously abundant species (endemic of the middle Syrdarya) was forced out by invaders from the Chinese fauna from the plain to the foothill zone of the rivers in the second half of the 20th century; the species state became threatening; it was included in the Red Book of Uzbekistan. In the 2000s, the presence of species in the foothill zone of the Chirchik was revealed. Between the total body length and the standard body length, a strong relationship was revealed, which is reliably described by the linear regression equation: SL = 0.85*TL – 1.673 (r = 0.99). A strong positive relationship between the total body weight and the standard body length is characterized by the regression line (W = 0.000012*SL3.0718).