Use of sorbents in fish farming

Abstract

The use of sorbents at present is a promising method for improving fish growing conditions. One of the types of sorbents is vermiculite, a natural mineral that has highly effective sorbing properties. It has been established that it is active against heavy metal ions, organic compounds such as phenol, dioxin, oil products, carcinogens, toxic chemicals, nitrites and nitrates, chlorine and fluorine compounds. The aim of the study is to study the effect of sorbent-vermiculite on the amount of nitrites and nitrates in water. When setting the goal, the following tasks were developed: to study the hydrochemical parameters and evaluate the effect of vermiculite on the vital activity / vitality of laboratory fish. The object of the study was a laboratory guppy fish (Poecilia reticulata). The fish was kept in aquariums with a volume of 10 liters. at room temperature with a natural change in day and night. They fed the fish with food "Waka TropiFlek for all types of fish." Vermiculite with a particle size of 1-5 mm was used as a sorbing substance. The study consisted of a control and one experimental group, 6 fish were in each aquarium. Vermiculite was added to the experimental group, prepackaged / wrapped in gauze and subsequently dipped in water. The duration of the experiment was 30 days. Studies have shown that the sorbent reduces the amount of nitrates and nitrites, reduces the rate of their accumulation in water and supports the vital activity of fish at critical values of the above hydrochemical parameters. According to the document “Strategy for the Development of Aquaculture in the Russian Federation for the Period Until 2020” (approved by the Ministry of Agriculture of the Russian Federation on September 10, 2007), in the Russian Federation it is necessary to determine the way to achieve a qualitative new state of aquaculture. Vermiculite may be an actual tool for use in the cultivation / reproduction of aquatic organisms.