Development of the natural fodder base organisms during breeding of carp fish larvae using soy milk in saltwater drainage system of Uzbekistan

¹ Bukhara State University, Muhammad Ikbol str., 11, Bukhara province, Uzbekistan, 105018
² Tashkent State Agrarian University, University str., 2, Tashkent province, Uzbekistan, 100140
³ Institute of Zoology, Uzbekistan Academy of Sciences, Bogishamol str., 232b, Tashkent, Uzbekistan, 100053

^* Corresponding author: n.n.tosheva@yandex.com

Abstract

In May-June 2019, the development of organisms of the natural food base in fry ponds was studied during the rearing of cultured cyprinids in the brackish water of the drainage system and when using a new type of fertilization/feeding of larvae - soy milk. In the samples, 76 species, forms and varieties of microalgae were noted. The total number of phytoplankton microalgae was 108,512.5 x 103 cl/l, biomass -20.5776 mg/ml. 10 species were found in the zooplankton of ponds (rotifers, cladocerans, copepods); the number of zooplanktoners varied 20.5 - 266.5 thousand ind./m³, biomass - 0.14 - 406.3 g/m³. 12 species of organisms have been recorded in the benthofauna. From a technological point of view, the results of rearing with the use of soy milk turned out to be very high: in 1 month of rearing juveniles of cyprinids in monoculture, fry of 4.5 - 9 g in size were grown from prelarvae with a yield of 43 - 49%.