He is an expert on nutrition of fish and shrimp for aquaculture, including freshwater (rainbow trout, tilapia, Indian major carps, common carp, zebrafish, silver barb) and marine (yellowtail, Japanese flounder and shrimp) species. His research interests span fish nutrition, physiology and aquaculture including nutrient requirements of fish; evaluation of ingredients for digestibility and formulation of nutritionally balanced, environmentally sustainable and cost-effective diets; and impacts of nutrition on fish physiology and gene expression.