Silas S.O. Hung

Silas S.O. Hung

Silas S.O. Hung, Ph.D.

Department of Animal Science
University of California, Davis
1 Shields Ave
Davis, CA 95616, USA

Officee: +1 530-752-3580
Lab: +1 530-752-7174
FAX: +1 530-752-0175


CEGEP , General Science, MacDonald College, McGill University, 1970-72.
B.S., Food Biochemistry, MacDonald College, McGill University, 1972-75.
M.S., Nutrition, University of Guelph, 1975-77.
Ph.D., Nutrition, University of Guelph, 1977-80.


Research in my laboratory has been focused on nutrition and feeding of different species of fish. I used growth trial to determine the essential nutrient requirements and utilization in different species of fish including white sturgeon, rainbow trout, Atlantic salmon, striped bass and hybrid tilapia. Biochemical analyses, enzyme assays, histology and histochemistry, and a combined technique of stomach intubation, dorsal aorta cannulation, and urinary catheterization I developed were used to evaluate the performance and to determine the optimum feeding rates, nutrient requirements and utilization of these fish, respectively.

Since 2000, I embarked on a new area of research, toxicology, because I always consider nutrition and toxicology as a continuum, from nutrient deficiency to excess of unwanted contaminants or toxicants. In 2000-2005, I was funded by the CalFed Bay-Delta Program to study the chronic toxicity of environmental contaminants in the Sacramento splittail using a biomarker approach.  In 2007-2010, I was funded by CalFed Science Program to study the quantitative indicators and life history implications of environmental stress on white and green sturgeon.  In this project I used the combined technique and growth trail, respectively, to study the short-term (48 h) and long-term (8 weeks) toxicokinetics and histopathology, respectively, of selenomethionine and/or methyl mercury in green and white sturgeon. Modeling was also used to determine the toxicokinetics of selenomethionine and/or methyl mercury in white sturgeon. In 2012-2015 I was funded by the CDFG ERP to study the effects of nutritional status on environmental stress tolerance in green and white sturgeon.  In this project I subjected green and white sturgeon to salinity and heat stress after they were feed restricted for 2 or 4 weeks. I measured their physiological response to determine their tolerance to these two stresses.  Currently I am studying the metabolome of green and white sturgeon after they were feed restricted.

Graduate Groups

Animal Biology