Researches Regarding Water Quality as an Indicator of Fish Welfare in Two Farms from the Southern Area of the Country

摘要

From two fish farms in the southern part of the country (Ulmu and Ciocanesti) there were collected water samples from rearing fish ponds at different depths and there were assessed physical chemical parameters by using Nova-60 device. The obtained results were compared with de admitted limits provided by Order no. 161/2006 regarding surface waters quality and for the fish with the limits provided by Schlotfeldt H. J. Following the researches, there were revealed conclusions from two points of view: water quality in the ponds as surface water and water quality related with recommendations for fish rearing. Thus, the pH, the solved oxygen and residual chlorine in the two farms ranged within the admitted limits for both approaches: as surface waters (Ist quality) and as water used for carp rearing. The nitrates and the nitrites have values which range them within the IInd quality class as surface water and values within the admitted limits for carp farming. The quality classes in which the waters from the two farms are ranging regarding total ferrum concentration are the IIIrd one at Ciocanesti and the IVth one at Ulmu, for carp rearing all values being appropriate. The phosphates concentrations are ranging the waters in the two farms within the Vth quality class. Regarding carp breeding, the phosphates concentrations revealed following the assessment had exceeded the admitted limits by 2 times in the samples collected from the surface, and by 3 times in the ones collected from 1.5 m depth.