Food base and nutrition of endemic lenok (Brachymystax savinovi) in Lake Markakol and in the reservoir of the river Uidene
Assylbekova S. Kushnikova L. Aubakirov B. Kasymkhanov A. Adyrbekova K. Umirtayeva A. Kostyuchenko D.
30 December 2023BIOFLUX SRL
AACL Bioflux
2023#16Issue 63331 - 3348 pp.
The feeding characteristics of the Markakol lenok Brachymystax savinovi (Mitrofanov, 1959) from two mountain reservoirs of East Kazakhstan, the Lake Markakol and the reservoirs of the river Uidene, were observed in the spring-summer period of 2021-2022. It has been established that the same-aged lenoks from Lake Markakol have higher size and weight indicators than from the reservoir on the river Uidene, which is due to different levels of trophicity of water bodies. The food base of Lake Markakol has high stocks of large benthic invertebrates, which are well used by fish as food, and to a greater extent are gammarus and leeches. At the reservoir on the river Uidene only the estuarine part of the reservoir is characterized by an increased level of trophicity (due to the mass development of chironomids) in terms of macrozobenthos, but other areas show a moderate or very low level of trophicity. A significant difference in the food base of the two reservoirs determines the nutritional spectrum of B. savinovi. In lenoks from Lake Markakol, the main component in the food bolus were gammarus and leeches, the most numerous and accessible food. Lenok from Lake Markakol have the widest range of nutrition in individuals aged 6+ to 8+ years. In the lenok from the reservoir on the river Uidene the largest number of food fragments was noted for individuals of 3 to 4 years old. The leading position in the food bolus is occupied by the common gudgeon and chironomid larvae. Fish in the stomach of a lenok from a reservoir on the river Uidene was registered in all age groups. To strengthen the food base of the reservoir on the river Uidene, it is necessary to introduce food benthos, in particular gammarids.
COI gene , macrozoobentos , nutritional spectrum , stomach filling index , trophic status
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Fisheries Research and Production Center LLP, Suyunbay Avenue, 89A, Almaty, 100141, Kazakhstan
Altai Branch, Fisheries Research and Production Center LLP, Protazanov Street, 83, Ust-Kamenogorsk, 070004, Kazakhstan
Department of Molecular Biology and Genetics, Faculty of Biology and Biotechnology, Al-Farabi Kazakh National University, Almaty, Kazakhstan
Department of Biodiversity, Faculty of Biology and Biotechnology, Al-Farabi Kazakh National University, Almaty, Kazakhstan
Fisheries Research and Production Center LLP
Altai Branch
Department of Molecular Biology and Genetics
Department of Biodiversity
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