• • • Increasing water dissolved oxygen via Chlorella vulgaris BIN in nursery fish ponds
Concentration of dissolved oxygen in water directly influences development and growth of water biocoenosis. Oxygen deficiency is a common problem at fish farms where it influences fish life time and productivity as well as pond physical and chemical parameters. The experiment tested the effect of feed “Algolizant”, based on Chlorella vulgaris BIN on chemical parameters of water and carp fingerlings. It had three ponds of the conventional diet and three experimental ponds with additional application of Chlorella vulgaris BIN. Twenty l ha-1 of “Algolizant” were applied twice for two months. The feed positively affected pond physical and chemical properties and increased concentration of water-dissolved oxygen, productivity and life time of carp fingerlings. Oxygen amount increased from 7.20 to 10.99 mg О2/dm3 in the experimental ponds, while in the control ponds it decreased from 8.94 to 7.44 mg О2/dm3 or by 48%. Average carp weight made up 519 kg ha-1 in the control and 716 kg ha-1 — in the experimental variants, exceeding the former by 27.5%. Economic efficiency resulted in additional profit of 27 750 rubles from 1 ha of pond, absences of water blooming and unpleasant odour, increase of dissolved oxygen content, water clarity and fish productivity.
Source: http://kormoproizvodstvo.ru/en/2-2019-2/, p. 28
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