Fish have low ability to absorb sugar, protein is the main nutrient for fish growth, most of which must be obtained from food, so the protein content of aquatic feed is generally required to be much higher than that of livestock feed, only in this way can the healthy growth of fish be guaranteed. In essence, fish and shrimp do not need protein but amino acids. However, animals cannot synthesize amino acids from simple inorganic materials, but must obtain amino acids directly or indirectly from the intake of animal and plant Therefore, fish and shrimp feed should not only pay attention to the quantity of protein, but also pay attention to its quality.
High protein content will not only cause the waste of feed protein resources, may cause hepatobiliary disease, fish body obesity, like human obesity, but also increase the pressure of pond water quality management. The high protein content of fish can not be metabolized, so they will discharge more organic waste into the water, which not only increases the cost, but also causes damage to the water environment, forming eutrophic fat water.
Too low protein content, on the one hand, will cause slow growth of fish, poor disease resistance, on the other hand, will delay the production time. Too low protein content can not meet the physiological needs of the fish body, malnutrition, poor growth, bait coefficient will be high, sometimes also cause physical weakness and disease.