It is believed that the feed with high protein level has better breeding effect. This is a one-sided and unscientific view. Protein is only an important nutrient that aquatic animals need, but not all. Under the condition of the same protein source, the growth effect of aquatic animals increases with the increase of protein level within a certain range, but the growth performance does not increase or declines when the protein level exceeds a certain level. Too much protein is a metabolic burden for aquatic animals.

In addition, the quality of protein is determined by the composition ratio and quantity of its amino acids. Under the same protein level, the amino acid composition of different protein sources is very different, resulting in large differences in growth effect. For example, fish meal and soybean meal, at the same protein level, the growth effect of feed with fish meal as protein source is better than that with soybean meal as protein source. Therefore, the protein level, other nutrient levels and raw material sources should be integrated to evaluate the quality of the feed.

 
According to the size of aquatic animals, choose the appropriate feed particle size. In this way, it can not only ensure the effective feeding of aquatic animals, but also avoid the waste of feed. Taking fish as an example, the selected feed particle size is generally within the range of 1/4 to 2/3 of the longitudinal length of the fish's mouth crack, and the aspect ratio of the feed should also be determined according to the specific breeding species, generally 1.5. ~2.5:1.
 
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