PhD candidate

Contact

   Email: sshlee@ucdavis.edu

   Phone: 530)752-7174 (lab)

   Major professor: Dr Silas S. O. Hung

Education

   PhD in progress - University of California Davis, CA, USA; Animal Biology

   MS (Aug 2008) - Pukyong National Univeristy, Busan, Rep of Korea; Fisheries Biology

   BS (Feb 2006) - Pukyong National University, Busan, Rep of Korea; Aquaculture

Research interest

1. Evaluating effects of feeding rates on growth performance and developing an optimum feeding rate model for white sturgeon

Establishing an optimum feeding rate, defined as the feeding rate at which the rate of growth is maximal, for a cultured fish is a significant step toward the success of the aquaculture operation. With use of various regression models an optimum feeding rate model has been developed, and we are currently writing a manuscript for publication.

2. Evaluating effects of restricted feeding on thermal and salinity tolerance for young white sturgeon

Due to global climate change, early life stages of white sturgeon spending part of their lives in the San Francisco Bay Delta may be exposed to environmental stresses including increasing water temperature and increasing salinity, but also indirectly to low quanlity and quantity of prey oranisms which can lower nutritional status of the sturgeon. Evaluating effects of restricted feeding on thermal and salinity tolerance for the young sturgeon may answer the question whether they possess the physiological capacity needed to survive and thrive when faced with thermal and salinity stresses. A 4-week restricted feeding trial in juvenile white sturgeon (7-month old) was performed and the nutritional status of the sturgeon were measured. Followed by the resricted feeding trial, thermal and salinity challenge tests were carried out. Samples related to the salinity challenge test including plasma ions, osmolality, glucose, lactate, and cortisol, muscle moisture content, and gill and pyloric caeca Na+/K+-ATPase activity were measured. Mucus, gill, brain, kidney, and liver samples were collected from the thermal challenge test for measuring heat shock protein 70 (Hsp70), and the assay will be performed in near future.

Selected publications

10. Seunghyung Lee, Liran Y. Haller, Nann A. Fangue, James G. Fadel, and Silas S.O. Hung (2015). Effects of feeding rate on growth performance and nutrient partitioning of young-of-the-year white sturgeon (Acipenser transmontanus). Aquaculture Nutrition. doi: 10.1111/anu.12255.

9. Liran Y. Haller, Silas S.O. Hung, Seunghyung Lee, James G. Fadel, Jun-Ho Lee, Maryann McEnroe, and Nann A . Fangue (2014). The effect of nutritional status on the osmoregulation of green sturgeon (Acipenser medirostris). Physiological and Biochemical Zoology, 88(1):22 – 42.

8. Seunghyung Lee, Yichuan Wang, Silas S.O. Hung, Anders B. Strathe, Nann A. Fangue, and James G. Fadel (2014). Development of optimum feeding rate model for white sturgeon (Acipenser transmontanus). Aquaculture, 433:411-420.

7. Nicola. De Riu, Keke K. Zheng, Jang-Won. Lee, Seunghyung Lee, Sungchul C. Bai, Giuseppe Moniello and Silas S.O. Hung (2012). Effects of feeding rates on growth performances of white Sturgeon (Acipenser transmontanus) fries. Aqua. Nutr., vol. 18, 290-296.

6. Jang-Won Lee, Nicola De Riu, Seunghyung Lee, Sungchul C. Bai, Giuseppe Moniello and Silas S.O. Hung (2011). Effects of dietary methylmercury on growth performance and tissue burden in juvenile green (Acipenser medirostris) and white sturgeon (A. transmontanus). Aqua. Toxicol., vol. 105, 227-234.

5. Sungchul Bai and Seunghyung Lee (2010). Culture of Olive flounder: Korean perspective. In Practical Flatfish Culture and Stock Enhancement (eds. H. V. Daniels and W. D. Watanabe), pp. 156 – 168. Wiley-Blackwell Publishers, Ames, Iowa.

4. Seunghyung Lee, Jun-Ho Lee, Silas S. O. Hung and Sungchul C. Bai (2010). Effects of the dietary toxic level of selenium (Se) in juvenile olive flounder, Paralichthys olivaceus. JWAS, vol. 41, 245-254.

3. A.M. Bakke, D.H. Tashjian, C.F. Wang, S.H. Lee, S.C. Bai and S.S.O. Hung (2010). Competition between selenomethionine and methionine absorption in the intestinal tract of green sturgeon (Acipenser medirostris). Aqua. Toxicol., vol. 96, 62-69.

2. Dong-Fang Deng, Chunfang Wang, Seunghyung Lee, Silas S.O. Hung (2009). Feeding rates affect heat shock protein levels in liver of larval white sturgeon (Acipenser transmontanus). Aquaculture, vol. 287, 223-226.

1. Seunghyung Lee, Jun-Ho Lee and Sungchul C. Bai (2008). A Preliminary Study on Effects of Different Dietary Selenium (Se) Levels on Growth Performance and Toxicity in Juvenile Black Seabream, Acathopagrus schlegeli (Bleeker). Asian-Aust. J. Anim. Sci., vol. 21(12), 1794-1799.