The length of the rivers in Uzbekistan and the presence of all the biotopes in the mollusks have made they a favourable reservoir for the mollusks. However, it should be noted that all species in the rivers differ in their density. Rivers and fishery farms play a great role in formation of bivalve mollusks fauna in the canals. It was studied the fishery farms of the Syrdarya River and its surroundings have a major effect on the fauna of the Mirzachul and South Mirzachul canals; the Zarafshan River’s effect on spreading of bivalve mollusks in the Dargom and Eskiankhor canals; the Amudarya River and its surrounding areas influence of fishery farms on the fauna of the Amu-Bukhara, Kizketgan and Karshi main canals. Colletopterum family breeds in the water studied, do not show any superiority in natural or artificial reservoirs compared to other breeds. Three species of these family are included in the Red Book of the Republic of Uzbekistan (C.baсtrianum, C. cyreum sogdianum, C. kokandicum). C. Bactrianum can be found only in rivers in the middle Zarafshan and Amudarya, in the Syrdarya river (Syrdarya Region only), in the reservoir and in the fishery farms only in Chelak, and the canals only in the Tuyatortar and Mirzachul canals.
Hydrochemical parameters of water in ecosystems of Gijdivan district of Bukhara region: O2 content 4,9 ± 0,5 mg / l, Cl2 312 ± 14 mg / l, mineralization - 992-1402 mg / l and oil products about 0,6-0,8 mg / l, it turned out that the amount of these elements in the water exceeds the permissible norm. The following conclusions were made on the basis of the study of the status of the species listed in the “Red Book” in aquatic ecosystems of the lower reaches of the Zarafshan river. We found that the population of the species Colletopterum and Corbicula in the village of Sultanabad in the Navoi region is a growing population, while the population of the species Colletopterum and Corbicula in the Gijduvan region of the Bukhara region is decreasing.
In the Chimkurgan reservoir there are 11 species and 2 subspecies belonging to 4 families. 11 species of mollusks belonging to 6 families were found in the Qoratepa reservoir. 5 species of Corbicula cor, C. fliminalis, C. purpurea, Corbiculina tibetensis and C. ferghanensis distributed in the Chimkurgan reservoir are eurybiont species and 9 species are Sinanondonta gibba, S. orbicularis, S. puerorum, Colletopterum ponderosum volgense, Euglesa bactrianum, C. syreum sogdianum, Odhneripisidium sogdianum were found to be stenobiont species. Corbiculina tibetensis and C. ferghanensis in the Qoratepa Reservoir have been studied as common eurybiont species, while the remaining species are stenobiont species.
One of the most pressing issues in the Mirzaarik Canal is the study of the distribution and ecological groups of hydrobionts in biotopes. As a result of our research in the Mirzaariq canal, we found 16 species of hydrobionts. From them we learned that 6 species of bivalve mollusks, 8 species of gastropod mollusks, 1 species of shrimp and 1 species of leeches were distributed. The Mirzaariq canal differs from the middle-flowing canals of the Zarafshan River in the number of species, which can be explained by the fact that the canal was built a long time ago.
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