Published in Scientific Papers. Series D. Animal Science, Vol. LXIII, Issue 1
Written by Lyudmila NIKOLOVA, Stanimir BONEV
A complex characterization of the physicochemical parameters of the water was performed in a sturgeon cage farm located in a dam in Southeastern Bulgaria during the different stages of the vegetation period. Water monitoring included key indicators for fish farming: temperature, dissolved oxygen, oxygen saturation, electrical conductivity, total hardness, pH, permanganate oxidability, biochemical oxygen demand over five days; ammonium nitrogen; nitrate nitrogen, orthophosphate content. There were significant negative correlation relationships: water temperature with dissolved oxygen levels (Rp = -0.702; P <0.05) and nitrate nitrogen (Rp = -0.867; P<0.01). Positive significant correlations were found between the electrical conductivity of the water with the water hardness (Rp = 0.636; P <0.05); water hardness with dissolved oxygen level (Rp = 0.855; P<0.01) and water saturation with oxygen (Rp = 0.958; P <0.001); dissolved oxygen and nitrate nitrogen in water (Rp = 0.647; P<0.05); phosphates with ammonium nitrogen levels (Rp = 0.598; P<0.05).
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