Ecological state of Tudakul reservoir in Uzbekistan and estimation of fish capture in last decades

R Khakimova,J Sobirov,N Mullabaev,B Sobirov,A Kobilov,V Kankhva

doi:10.1051/e3sconf/202125808029

R Khakimova, J Sobirov + Show 4 more

Open Access

https://doi.org/10.1051/e3sconf/202125808029

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Abstract

The problem of anthropogenic impact of the Tudakul reservoir has not been spared. In the first years of the reservoir’s existence, its ichthyofauna was formed by the fish of the Zarafshan River, which were represented by both rheophiles and limnophiles, and initially it consisted of 11 aboriginal species and introduced fish. This paper gives a brief physical-geographical, hydrological, hydrochemical, hydrobiological characteristics of the Tudakul reservoir. An assessment of the ecological state of the reservoir, ichthyofauna and fish catch in it over the past decade is given. Recommendations for the rational use of the Tudakul reservoir are given.

Highlights

Hydroconstruction and regulation of river flows, construction of irrigation canals, carried out since the middle of the last century, destroyed the isolating barriers for aquatic organisms and connected all the main river basins of the Amu Darya, Zarafshan, Kashkadarya, Syrdarya and others [1, 5-8]
In the first years of the reservoir's existence, its ichthyofauna was formed by the fish of the Zarafshan River, which were represented by both rheophiles and limnophiles, and initially it consisted of 11 aboriginal species and introduced fish [1-4, 10]
Before the commissioning of the Amu-Bukhara Canal, the Tudakul reservoir was a recipient of the excess waters of the Zarafshan River, and after that it began to be filled with water from the Amu Darya River, which contributes to the penetration of its fauna through the irrigation system into the Tudakul reservoir [3, 6]

Summary

Introduction

Hydroconstruction and regulation of river flows, construction of irrigation canals, carried out since the middle of the last century, destroyed the isolating barriers for aquatic organisms and connected all the main river basins of the Amu Darya, Zarafshan, Kashkadarya, Syrdarya and others [1, 5-8]. All these factors led to the mixing of fauna and the independent dispersal of a large number of aquatic organisms. As a result of naturalization, having reached a high number, put pressure on the aboriginal ichthyofauna, gradually displacing and assimilating their ecological niches [2, 3]. As a result of such an onslaught on the part of the invaders, the historical structure of the fish population of water bodies was disrupted, the habitat and the area of distribution of native fish species changed [3]

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