Investigation of the environmental impacts of off sea cage culture facilities in the central black sea on the water column and sediment axis

In this study, salmon in the Eastern Black Sea Region Salmon (Oncorhynchus mykiss) in the Central Black Sea Region, Sinop Province, Dikmen In a private enterprise established for commercial purposes in the district of Kerim Village Offshore, during the aquaculture activity, the quality of seawater and bottom sediment changes were examined. The research was carried out in May of 2021-2022. From the data obtained at the end of the research, the pollution load change of the Trix index sediment sample from the seawater bottom and surface was calculated. Water samples were taken from 7 stations (a total of 14 measurement points, from the surface and 46 m depth) determined as the sampling point, and some physicochemical parameters were analyzed. As a result of the study, in the water samples; water ,10-24.00 oC; pH 8.32-8.55; dissolved oxygen 8.32-8.93 mgL-1; saturated oxygen 85-98% ; salinity 16.7-17.3%; total phosphorus (PO4-P) 10-25 µg/L ; nitrite nitrogen (NO2-N) <2 µg/L ; ammonium nitrogen (NH4 + -N) 10-21 µg/L; nitrate nitrogen (NO3-N) 66-141 µg/L; secch disc depth 10.4-11.4 m ; chlorophyll -a values varied between 0.25-0.43 µg/L. Sediment samples were monitored at 2 stations and the Redox potential was 39-64 mV; Total Phosphorus 765-879 mg/kg; Total Organic Carbon (TOC) 12.82-14.68 mg/g; Beggiotao bacteria could not be detected. After the examination of sea water and sediment parameters, it was observed that there was no risk of eutrophication in the water column due to the increasing sea temperature in May, and there was a limited increase in net cage farming over the years.