Morphological and biological variability of young asp fishes Aspius aspius (Linnaeus, 1758) in the Syrdarya River

  • Мaмилов Н.Ш., Кожaбaевa Э.Б., Aдильбaев Ж.A., Aдильбaев Ж.A., 1 - SRI Of Biology and Biotechnology Problems, Kazakhstan, Almaty; 2 - Karatausky State Nature Reserve, Kazakhstan, Almaty


The asp Aspius aspius (Linnaeus, 1758) is one of the main commercial fishes in the Syrdarya watershed now. Environmental conditions during winter to summer 2016 were favorable for reproduction of this fisheshere. The routine procedure of biological and morphological analysis wasapplied to young fishes collected in three different stations. States of 6biological, 7 counted and 30 measured traits were investigated. 1 yearold and born 2016 fishes were presented in samples from each site. Individual appearance of all fishes was normal. Their bodies profile was ovalwith slightly convex belly. That allowed us to take the obtained data onsize, weight and fatness as normal. Significant variability of all investigatedmorphological characteristics was observed. Statistical analysis of loadingof each trait on principal components was conducted to evaluate impactof environmental conditions and allometry to morphological variability ofyoung fishes. Influence of absolute body size to variability of fish profilewas less than the traits of head and fins. Absence site and size dependedmorphological differentiation between investigated young fishes indicatedhomogeneity of environmental conditions here and allowed to supposeimpact of some stabilizing selection against extreme deviants in this population. Obtained data did not allow us to reveal the size when young fishesbecame predator. Young freshwater shrimps were the most important feeding object for both ages’ young fishes. Number of rays in abdominal finswas one of very important traits for young fish variability. This characteristic is one of the most conservative for fishes belong to the Cyprinidaefamily and so it can indicate genetic differentiation of adults, but specialmethods of molecular genetics should be applied to solve this assumption.Common state of the asp population in the Kazakhstan part of the SyrdaryaRiver was evaluated as least threatened.Key words: asp, morphology, plastic, counted, principal components
How to Cite
AДИЛЬБAЕВ Ж.A.,, Мaмилов Н.Ш., Кожaбaевa Э.Б., Aдильбaев Ж.A.,. Morphological and biological variability of young asp fishes Aspius aspius (Linnaeus, 1758) in the Syrdarya River. Eurasian Journal of Ecology, [S.l.], v. 49, n. 4, p. 142-152, nov. 2018. ISSN 2617-7358. Available at: <>. Date accessed: 09 july 2020.