Abstract
Industrial fish farming is the most dynamically developing area of domestic aquaculture. Therefore, the problem of obtaining live feeds for growing juvenile fish under artificial conditions is of utmost importance, since such feeds are characterized by high nutritional value, high content of protein, fat, essential amino acids, vitamins, enzymes and other important components. One of the most commonly used zooplanktonic species for feeding juvenile fish is Daphnia magna, which is characterized by high fertility, rapid growth, adaptability to a wide range and changes in abiotic environmental factors. However, in order to obtain consistently high results from the cultivation of these organisms, it is necessary to create a specific set of conditions in each individual case. The results of growing Daphnia magna for food purposes in small containers with standing water are presented. At the same time, an experiment was carried out to select the best possible feeding option. Glass containers with three liters of water were used; the density of the Daphnia planting was 2000 pcs/l. The water temperature was maintained at +19 to +21°C. Artificial lighting was provided for 14 hours per day. The water was changed once every two days for 70% of the initial volume. The duration of the test was 14 days. In all experimental variants, the ammonia content of nitrites and nitrates did not exceed the MPC. The best growth rates were obtained when the Daphnia were fed with chlorella culture compared to feeding with yeast or a mixture of yeast and chlorella. The use of a chlorella-only diet reduced water turbidity and increased Daphnia survival rate of by 17–25%, and feed yield by 23.6–39.1% compared to other experimental options.
Published Version
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