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Articles by Osman Ozden
Total Records ( 3 ) for Osman Ozden
  Senol Guzel , Kenan Gullu and Osman Ozden
  The effect of oral administration of 20 mg of estradiol valerate (E2V) per kilogram of administered diet was studied on sex reversal in 35-day-old (average 0.32±0.02 g) rainbow trout, Oncorhynchus mykiss. The E2V was treated for 56 days to fry. The research was carried out totally 355 days. At the end of this time, all fish were sampled, digested and analyzed for their sex determination and the Gonadosomatic Index (GSI) values of the E2V and control groups were calculated. Compared to controls, there were changes in sex composition of E2V treated fish. The sex composition of E2V treated fish was found as 97% of female and 3% inter-sex. However it was found as 51% of female and 49% male in the control fish. Gonadosomatic indices of the E2V and control groups were calculated as 0.12 and 4.21%, respectively. It was concluded that the determined application time, dose and period of E2V in this study were effective in direct feminization of rainbow trout.
  Yusuf Guner , Osman Ozden and Kenan Gullu
  The Na+-K+-ATPase enzyme activity in gill tissues, changes of plasma ions level and, survival and growth performances of rainbow trout, Oncorhynchus mykiss, were investigated after gradual and direct acclimatization to high saline water in the Aegean Sea. Five experiments were performed with rainbow trouts weighing 120, 140, 160, 200 and 225 g. In this experiment, Na+, Cl-, K+, Ca+ and Mg+2 ion levels in blood plasma, Na+-K+-ATPase enzyme activities in gill tissues of rainbow trouts weighing 160 g in both freshwater and saltwater were measured. After adaptation to seawater, fish were held in marine cages of 64 m3 volume to grow up at Island of Urla-Karantina. Rainbow trouts weighing 120, 140, 200 and 225 g were reared in these cages for 80 days. Parallel to that, fish weighing 225 g were stocked in freshwater for comparison. The best survival percentage among directly acclimatized rainbow trouts was seen in 200-225 g fish, whereas the survival percentage among gradually acclimatized trouts presented similar results in every group. It can be concluded from these studies that, rainbow trout in certain seasons (Autumn-Winter) can adapt to the Aegean Sea condition (3.6-3.7%) and show good growth performance.
  Musa Bulut , Osman Ozden , Sahin Saka and M. Kursat Firat
  In this study, biochemical composition of fertilized dentex (Dentex dentex) eggs were examined and their protein, moisture, lipid and fatty acid contents were analyzed. The results showed that dentex eggs have 74.25±0.61% moisture, 11.57±0.25% protein, 2.57±0.07% ash and 4.97±0.07% lipid. Fatty acid analysis showed that dentex eggs contain 36.37±0.09% saturated fatty acid, 38.57±0.03% monosaturated fatty acids (MUFA) and 24.44±0.04% polyunsaturated fatty acids. The diameter of dentex eggs was 1.05±0.06 mm.
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