Chhorn Lim, PhD, has more than 25 years of experience in aquaculture nutrition and feed development research. Currently, he is the Nutrition Scientist at the Fish Diseases and Parasites Research Laboratory, U.S. Department of Agriculture, Agricultural Research Services at Auburn, Alabama, where he conducts research on the interactions between nutrition, immune system function, and disease resistance. Carl D. Webster, PhD, has more than 10 years of experience in aquaculture nutrition and diet development research. Currently, he is Principal Investigator for Aquaculture at the Aquaculture Research Center, Kentucky State University, where he conducts research on nutrition requirements and practical diet formulations for fish and crustacean species that are currently or potentially cultured.