MORPHOLOGICAL CHARACTERISTICS OF THE AMUR GOBY IN THE CHIRCHIK RIVER BASIN OF UZBEKISTAN

In 2024, the morphological features of the Amur goby (Rhinogobius brunneus) were studied in the Chirchik River basin, Uzbekistan. The species was accidentally introduced into ponds in the lower stream of the Chirchik River, found favorable environments in many lentic lowland water bodies of the Aral Sea basin and became a mass trash fish. A total of 25 individuals with a total length of 3.2 - 4.4 cm, a standard length of 2.7 - 3.7 cm, and a total weight of 3.6 - 4.5 g were analyzed. A strong relationship was found between the standard body length and the total body length of the char, which is reliably described by the linear regression equation: SL = 0.754 * TL + 0.313 (r = 0.94). The Amur goby has an elongated body, slightly compressed from the sides. The head is not flattened. The anterior nostrils are elongated into small tubes. The eyes are set high. The terminal mouth has thick lips. The two dorsal fins are separated. The pelvic fins are connected into a kind of disc-shaped sucker. The caudal fin is rounded. In the first dorsal fin of all fish there were 6 spiny rays, in the second - 1 spiny and 8 soft rays. In the anal fin there is 1 spiny ray and 8 soft. There is no lateral line. The plastic characters are given according to the classical sekhma of measurements for perch and according to the characters of geometric morphometry (truss-protocol).