The state of zooplankton in the feeding pond when growing commercial underyearlings of carp using a one-year combined technology

Abstract

The paper presents the characteristics of the zooplankton of a feeding pond when it is stocked with carp larvae grown in recycling aquaculture systems (RAS). Larvae were received in the RAS by the factory method of reproduction on April 26, 2020, which is at least 1 month earlier than the terms of natural spawning of carp in ponds. Increasing the growing season allows you to get commercial carp in one season instead of 2 years. The mass of larvae during stocking was 50.1 ± 2.5 mg. 210,000 pieces of carp larvae were released into a feeding pond with an area of 20 hectares on 05/15/2020. The research took place on a reservoir located in the Ordynsky district of the Novosibirsk region from 15.05.2018 to 30.09.2018 and from 15.05.2020 to 30.09.2020. In 2018, the cultivation of commercial two-year-olds from carp yearlings weighing 70.2 = 10.3 g from 29.05.2018. The total volume of stocking is 700 kg. The aim of the research was to study the species composition of zooplankton in a feeding pond during its early stocking by an undergrown carp larva and compare it with the traditional technology of the introduction of carp yearlings. The tasks included: to establish the thermal regime of the reservoir, abundance and biomass of zooplankton, to identify the dynamics of the mass of carp fingerlings and to establish feed coefficients.