The Role of Microalgae in the Cultivation of Zooplankton (Daphnia)

In this study, the morpho-biological characteristics of the <em>Daphnia magna </em>Straus culture and microalgae of the genera <em>Ankistrodesmus</em>, <em>Botryococcus</em>, <em>Scenedesmus</em>, <em>Chlorococcum </em>and <em>Chlorella</em> were studied. Protein and fat storage of micronutrients was determined. It has also been found that when <em>Daphnia magna </em>cultures are propagated on the basis of micronutrients, their growth rate and biomass production. The results showed that the average growth rate of daphnia on the basis of strains of the genus <em>Chlorella</em> was 1.33%, on the strains of the genus <em>Chlorococcum</em> - 0.74%, 55.5% higher than the chlorella strains 43.1% higher than the strains of the genus <em>Scenedesmus</em>. This is due to the fact that the cells of the <em>Chlorella</em> strain are thicker and more difficult to break down than other species. The protein and fat storage of the <em>Daphnia magna </em>Straus culture grown on the basis of micronutrients has been studied. According to the results obtained, <em>Daphnia magna </em>Straus, fed on the basis of representatives of the <em>Ankistrodesmus</em> generation from microalgae relative to the control, recorded 28.67% protein and 3.9% fat. The <em>Scenedesmus</em> genus has 29.07% protein, 4.03% fat, <em>Botryococcus</em> 31.36% protein, 4.12% fat, <em>Chlorella</em> 28.60% protein, 3.64% fat, <em>Chlorococcum</em> 34.10% protein and 3, 84% fat retention was found. <em>Daphnia </em>species based on <em>Chlorococcum</em> and <em>Botryococcus</em> microalgae have been recommended for breeding and use as a source in feeding small fish fry.

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