In the present study, structural and bio-technical features of marine fish aquaculture businesses in Ordu and Trabzon. Questionnaires based on the complete count method were applied to a total of 13 businesses (5 in Ordu and 8 in Trabzon) and original data were obtained. Based on the data obtained, the average feed conversion ratios of the net cage businesses in Ordu were calculated as 2.01, 1.52 and 2.70 for sea bass, rainbow trout and sharpsnout seabream, respectively, while those of the businesses in Trabzon were calculated as 2.09 and 1.53 for sea bass and rainbow trout, respectively. It was determined that all of the businesses in Ordu engaged in sharpsnout seabream breeding while only two businesses in Trabzon did so. The average harvest weight was determined as 350-500 g for sea bass, 500-1000 g for rainbow trout and 250-350 g for sharpsnout seabream. It was determined that Vibriosis, Yersiniosis, Pasteurellosis and Aeromonas infections were observed in the businesses. In comparison with those in Trabzon, the businesses in Ordu were found to have high mortality rates for rainbow trout and low mortality rates for sea bass. It was also determined that the businesses in Ordu were more equipped. In light of the data obtained, it can be said that in order for businesses to operate more efficiently and to eliminate the problems encountered, it is necessary to establish hatcheries, disease diagnosis laboratories and handling facilities in the region while working towards increasing market demand and organization.