Feeding and Growth

Abstract

From its food a fish must obtain both macro- and micronutrients (Halver, 1989). The macronutrients are proteins, lipids and to a lesser extent carbohydrates. These macronutrients supply the basic building blocks — amino-acids from proteins, fatty acids from lipids and sugars from carbohydrates—which are used to repair damage to body tissues and to synthesize new flesh. The macronutrients are also the fuel that is oxidized during respiration, yielding energy. This energy is used to do the work of maintaining a functioning body, swimming and synthesizing new tissue in the form of body growth or reproductive products (eggs or sperm). The micronutrients are the essential vitamins and minerals that are required, in small quantities, for effective metabolism.