SPECIAL STORY 58 FEED & ADDITIVE MAGAZINE March 2023 INTRODUCTION Development of the cost-effective nutritionally balanced diets for fish is the major factor that affects intensive aquaculture due to its influence on growth, health, and production costs. Nutrients and energy are needed in the diet for proper growth and maintenance. Fish are known to utilize protein preferentially over lipids or carbohydrates as an energy source protein utilization can be improved by increasing the dietary energy level. Since protein sources are among the most expensive component of feed ingredients, it is economically desirable to minimize the protein level in the diet. Excess protein can be replaced by an energy-rich compound such as lipid. Lipid is an important nutrient for fish which provides a source of energy, essential fatty acid incorporation of well-balanced levels of lipid in fish diets can maximize protein sparing which can be used for reducing the feed cost and minimizing nitrogenous waste output from fish farm effluents into the aquatic environment this article describes the lipid utilization and the additives used for the improvisation of lipid. IMPORTANCE OF LIPIDS Lipids supply energy, act as a structural component of cell membranes, and reduce the protein content in the diets of aquatic animals. Lipids have been reported to play a significant role in fish’s optimal growth and NUTRITIONAL EMULSIFIERS TO IMPROVE LIPID UTILIZATION IN FISH “Fats and oils constitute the main energy source of animals and possess the highest caloric value of all nutrients, with almost 3 times higher apparent metabolizable energy. Hence, fats are widely added to animal diets to meet energy requirements. However, their digestion, and absorption, are poorly developed in young animals and ultimately provide lower available energy to fish. Hence the addition of an emulsifier in feed could enhance lipid digestibility...” G. Sanjay Gopal, Mir Ishfaq Nazir, C. Sathishkumar, T. Bhuvaneshwaran Tamil Nadu Dr. J. Jayalalithaa Fisheries University
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