@article{park_kim_kim_daniels_2011, title={Effects of two different ozone doses on seawater recirculating systems for black sea bream Acanthopagrus schlegeli (Bleeker): Removal of solids and bacteria by foam fractionation}, volume={44}, ISSN={["1873-5614"]}, DOI={10.1016/j.aquaeng.2010.11.001}, abstractNote={Foam fractionators, with and without additional ozonation, were evaluated for their effect on solids removal (suspended solids, SS; volatile suspended solids, VSS; dissolved organic carbon, DOC), particle size distribution of the foam in seawater recirculating systems during a 44-day experimental period. The effect of ozone on heterotrophic bacteria was also quantified in the entire system. Three separate but identical recirculating systems (4.5 m3 system volume) with foam fractionators (300 mm in diameter, 3 m in height) were used in this study. One system (Control: CS) did not receive ozone, while the other two systems were ozonated at a rate of either 20 g ozone/day (T 20) or 40 g ozone/day (T 40) per kg of feed applied, respectively. A total of 107 kg of black sea bream Acanthopagrus schlegeli (Bleeker) with an average weight of 334.5 g was stocked into each system. Daily feeding rate was 1% of total body weight. The solids enrichment factor (EF = Cc/Ci, where Cc = concentration in foam condensate, Ci = concentration in inlet water) in T 40 was 10 times more dilute than the factors in CS and T 20. However, due to the higher volume of the foam (>10 times) in T 40, the removal rates of SS, VSS and DOC were the highest in T 40, but were not significantly different from T 20 (P > 0.05). The mean particle sizes at the 90% cumulative removal point decreased with ozonation, 71.2 ± 15.9, 57.9 ± 10.2 and 48.0 ± 10.2 μm in CS, T 20 and T 40, respectively. The overall mean particle diameter of solids in the foam decreased as ozonation increased, with values of 29.4 ± 4.4, 23.9 ± 3.8 and 20.5 ± 3.7 μm in CS, T 20 and T 40. Numbers of heterotrophic bacteria in the inlet were 6.21 ± 4.93 × 105 CFU/mL, 0.29 ± 0.19 × 105 CFU/mL and 0.30 ± 0.29 × 105 CFU/mL in CS, T 20 and T 40, declining sharply with the addition of ozonation. As the number of the bacteria in the inlet decreased, the bacteria in the foam and the removal rate greatly decreased with increasing ozonation. However, EFs in T 20 (76.4) and T 40 (14.5) were higher than that in CS (12.2), and the T 20 showed significantly higher EF (P < 0.05). Therefore, based on the EF, ozonation improved the removal efficiency of heterotrophic bacteria, even at the lowest concentration.}, number={1}, journal={AQUACULTURAL ENGINEERING}, author={Park, Jeonghwan and Kim, Youhee and Kim, Pyong-Kih and Daniels, Harry V.}, year={2011}, month={Jan}, pages={19–24} }
 @article{oh_kang_myoung_kim_park_daniels_2010, title={Effect of Ration Size Restriction on Compensatory Growth and Proximate Composition of Dark-banded Rockfish, Sebastes inermis}, volume={41}, ISSN={["1749-7345"]}, DOI={10.1111/j.1749-7345.2010.00435.x}, abstractNote={Compensatory growth and chemical composition of dark-banded rockfish (mean weight: 13.6 g) were examined after fish had experienced five different pre-feeding regimes. Fish were fed at 0% (R0), 25% (R25), 50% (R50), 75% (R75) and 100% (control) satiation for 2 wk before satiation feeding for 5 wk. Fish of R75 and R50 achieved the same body weight as the control fish after satiation feeding for 2 and 5 wk, respectively. Although the specific growth rate and feed efficiency of R25 and R0 fish were higher than those of the control fish during the first 3 wk of satiation feeding, they did not caught up with the body weight of the control fish. At the Week 2 and Week 7, the ratios lipid to lean body mass of R50, R25 and R0 fish were significantly lower than those of control fish, and there was no difference between the control and R75 fish. This result suggests that the fish subjected to a proper pre-restricted feeding (50-75% satiation) for 2 wk result in complete compensatory growth, while the fish experienced more severe feed restriction (0-25% satiation) show a partial compensatory growth capacity.}, number={6}, journal={JOURNAL OF THE WORLD AQUACULTURE SOCIETY}, author={Oh, Sung-Yong and Kang, Rae-Seon and Myoung, Jung-Goo and Kim, Chong-Kwan and Park, Jeonghwan and Daniels, Harry V.}, year={2010}, month={Dec}, pages={923–930} }