BIOLOGICAL AND COMMERCIAL CHARACTERISTICS OF TENCH (TINCATINCA) IN THE KIGASH RIVER

This paper presents materials on the stocks and biological characteristics of the tench. It is shown that the length and body weight and age of a tench fluctuate over years. It was revealed that the spawning part of the tench population consists of groups of different ages, but the main part of the tench population provided a commercial stock at the age of 5. According to our data, the sexually Mature age of Lin becomes 3-4 years. High fecundity reaches 300-400 thousand eggs. As a result of the study of the Kingash river, the number of tench in the catches is small and does not exceed the stocks of other fish species, which is due to the small population. The largest catches of tench were recorded in 2015 - 29.9 tons. In the following years - 2016-2019. the number of tench in catches decreased to 6,547 tons (2018), but in 2019 it increased to 8.75 tons. Semi-migratory fish species, upon reaching maturity, make massive spawning migrations in the spring to the places of spawning grounds, after spawning leave the river and walk in the pre-mouth space. Fluctuations in tench abundance in catches are associated with changes in natural factors influenced by water levels and river flow rates.

1. Kım Iý.A., Mýhsanov A.M., Kamıeva T.N., Kýzmenko S.V. Ihtıofaýna Jaıyk-Kaspııskogo raıona. Atyraýskıı gosýdarstvennyı ýnıversıtet ımenı H.DosmýhamedovaVestnık (naýchnyı jýrnal). №2 ııýn Atyraý. 2015. S.91.

2. Abdosheva M.M., Ebý A., Kýzmenko S.V. Promysel ı raspredelenıe ıhtıofaýny v r.Kıgash. Atyraýskıı gosýdarstvennyı ýnıversıtet ımenı H.DosmýhamedovaVestnık (naýchnyı jýrnal). №1mart Atyraý. 2016. S.141.

3. Bokova E.B., Mýhsanov A.M., Kamıeva T.N. Vıdovoe raznoobrazıe ıhtıofaýny JaıykKaspııskogo basseına. Vestnık№4 Atyraýskıı gosýdarstvennyı ýnıversıtet. Atyraý. Izd.AGÝ, 2015g.dekabr. S.152.

4. Pravdına I.F. Rýkovodstvo po ızýchenııý ryb.- M.: Pıevaıa promyshlennost, 1966. - 376 s.

5. Chýgýnov N.I. Rýkovodstvo po ızýchenııý vozrasta ı rosta ryb.- M.: Izd-vo AN SSSR, 1952. - 163 s.

6. Kadımov E.L., Ýrazgalıeva R. Sravnıtelnyı analız dannyh gıdrologıcheskogo rejıma r.Kıgash. Atyraýskıı gosýdarstvennyı ýnıversıtet ımenı H.DosmýhamedovaVestnık (naýchnyı jýrnal). №3 sentıabr Atyraý. 2019. S.124.

7. Bokova E.B., Djýnýsova M.M., Bektemırov J. Sostoıanıe estestvennogo vosproızvodstva polýprohodnyh vıdov ryb v ýslovııah ızmenenııa gıdrologıcheskogo rejıma r.Jaıyk. /Atyraýskıı gosýdarstvennyı ýnıversıtet ımenı H.Dosmýhamedova Vestnık (naýchnyı jýrnal) /№3 sentıabr Atyraý. 2019. S.117.