Current state of aquatic biological resources in the Balkhash-Ili Basin
The maternal composition of ichthyofauna in the Balkhash-Ili Basin was extremely poor, and consisted of several native species that belonged to the Nagorno-Asian faunistic complex. As early as 1885, the introduction of the European carp into the basin was recommended, and it was carried out at the beginning of the 20th century. Large-scale fish introductions were conducted between 1964 and 1988. Formation of a significant commercial stock of common bream, zander (pike perch) and asp, which became the main commercial fish species of the basin, was a positive effect associated with this period. After implementation of a series of acclimatization programs, the modern composition of the fauna in the basin was formed, comprising both introduced and native species. This article discusses the current state of aquatic biological resources in the Balkhash-Ili Basin. The data on the state of fish resources, species diversity of fish communities, fish population dynamics, and the commercial fish stock in the Qapshaghay Reservoir and the Ili River are presented. The main reasons for the decrease in the ichthyofauna natural reserves are determined: regulation of the rivers with spawning grounds, unfavourable hydrological regime, unsustainable fishing, and poaching pressure. To improve the state of natural fish stocks, it is necessary to increase the efficiency of their reproduction and to implement measures on restoration and rational exploitation of the aquatic biological resources in the Balkash-Ili Basin.
| Main Authors: | , |
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| Other Authors: | |
| Format: | Journal Contribution biblioteca |
| Language: | Russian |
| Published: |
2020
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| Subjects: | Aquatic living resources, Rational exploitation, Commercial species, Illegal fishing, Natural populations, Conservation measures, Acclimatization, Population dynamics, Common bream, Pike perch, Промысловые виды, Браконьерский лов, Естественные популяции, Лещ, Судак, Рациональное использование, Водные живые ресурсы, ASFA_2015::I::Ichthyofauna, ASFA_2015::S::Species diversity, ASFA_2015::I::Introduced species, |
| Online Access: | http://hdl.handle.net/1834/17247 |
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