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  • [ X ]
    Öğe
    Examination of Ammonium Removal Efficiency and pH Changes with Natural Adsorbents (Zeolite and Bentonite for Water Quality Applying in Aquaculture
    (Centre Environment Social & Economic Research Publ-Ceser, 2019) Oz, M.; Sahin, D.; Sertasi, E.; Oz, U.; Karsli, Z.; Aral, O.
    Various methods can be used to remove ammonium from the water. In this study, the objective was the adsorption of ammonia by using harmless natural adsorbents. The toxic effect of ammonia on aquatic organisms changes depending on pH values. It was also focused on investigate the effects of the adsorbents on the pH in ammonium adsorption process.In this research, six trial groups (zeolite (Z:7 g.l(-1), 14 g.l(-1)), bentonite (B:7 g.l(-1), 14 g.l(-1)), zeolite+bentonite (Z+B:3.5 g.l(-1) + 3.5 g.l(-1), 7 g.l(-1) + 7 g.l(-1))) with 3 repetitions were created. At the end of the experiment, TAN, NH3 and pH values were calculated 7.15 +/- 0.23, 6.04 +/- 0.16, 8.59 +/- 0.20, 7.69 +/- 0.23, 7.61 +/- 0.16, 6.57 +/- 0.15; 0.28 +/- 0.01, 0.24 +/- 0.01, 0.40 +/- 0.01, 0.41 +/- 0.01, 0.32 +/- 0.01, 0.29 +/- 0.00; 8.10 +/- 10.01, 8.10 +/- 0.01, 8.18 +/- 0.01, 8.24 +/- 0.01, 8.13 +/- 0.00, 8.16 +/- 0.01 for 7 g.l(-1)Z, 14 g.l(-1)Z, 7 g.l(-1)B, 14 g.l(-1)B, 7 g.l(-1)Z+B, 14 g.l(-1)Z+B respectively. There were difference in TAN, NH3 and pH values between the experimental groups (p<0.05). Zeolite and bentonite are natural adsorbent used for removal ammonia in aquaculture. When the data acquired in the experiment are evaluated, it was determined that zeolite have the best values in the same conditions like temperature, initial pH, initial concentration, particles size and amount. An increase in the pH and decrease in NH3 values was also detected in 6 experimental groups, but it was determined that this increase did not exceed the optimum values for aquaculture.
  • [ X ]
    Öğe
    THE EFFECT OF HORMONE (17α-METHYLTESTOSTERONE, 17β-ESTRADIOL) USAGE ON DEVELOPMENT, SEX INVERSION AND PIGMENTATION OF ELECTRIC YELLOW CICHLID (Labidochromis caeruleus FRYER, 1956)
    (Corvinus Univ Budapest, 2018) Karsli, Z.; Sahin, D.; Oz, M.; Aral, O.
    This research was designed in order to examinate the effects of 17 alpha-methyltestosterone and 17 beta-estradiol hormone use on the development, growth performance, survival, sex ratio and coloration of the electric yellow cichlid (Labidochromis caeruleus Fryer, 1956). Seven different groups were designed in the study. While no hormones were added to the control diet, 6 different rates of hormones were added to the other groups. Cichlid mean weight was determined as 0.64 +/- 0.01 g, were stored such that three replications for each group. The fish were fed with the feeds for a period of 2 months. At the end of this research, the highest weight gain was determined in the 20 mg kg(-1) 17 alpha-MT group (0.39 +/- 0.17 g). When the sex change rates were evaluated, it was determined that the feminization rates in the 17 beta-ES hormone group were 80.00%, 82.22% and 86.67%, respectively, and all fishes in the 17 alpha-MT hormone group were 100% male. When the results of the physical color analysis were evaluated, it was determined that the best coloration was obtained in the 17 alpha-MT groups. At the end of the study, the 17 alpha-MT hormone was determined to have a better effect than 17 beta-ES hormone on the growth, feed conversation rate, sex change and pigmentation of electric yellow cichlid (Labidochromis caeruleus Fryer, 1956).