How do aquaculture farmers choose aquatic feed scientifically
1, judge the quality of feed through sensory indicators, relying on vision, smell, taste and touch. The color of the high-quality feed is uniform, without mold, deterioration, agglomeration, insect damage, etc.; the feed has a normal smell, no rancidity, oil burning, etc.; the shape and size of the particles are uniform, there is no crack on the surface, and it has certain water resistance in water.
2. According to the size of aquatic animals, choose the appropriate feed particle size. In this way, the effective feeding of aquatic animals can be ensured, and the waste of feed can be avoided. 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 mouth cleft, and the aspect ratio of the feed also depends on the specific cultured species, generally within 1.5 ~2.5:1.
3. In the choice of feed grade, the main basis is the balance point of breeding. If the price of fish per catty in the market does not exceed the feed cost of fish farming per catty, low-grade compound feed should be selected; if the price of fish per catty is high When considering the feed cost of single catty fish farming, high-grade compound feed should be selected. Generally, the higher the grade of feed, the more cost-effective it is. 4. In terms of feed performance, it is necessary to choose high-quality feed, pay attention to the growth performance of aquatic animals after feeding the feed, pay attention to the feed coefficient, and how to ensure the health of aquatic animals. High-quality feed has the following characteristics: low bait coefficient, fast growth, and low disease incidence. 5. Several misunderstandings to pay attention to when choosing: 1. Only pay attention to the price of feed when choosing, and deliberately pursue low-priced feed. Low-priced feed often compromises the quality of the feed, with a long growth cycle and high feed coefficient. Although the price of high-quality feed is high, it can shorten the breeding cycle, thereby reducing the risk of breeding and the cost of water and electricity management caused by the long cycle. In the middle and late stages of aquaculture, it is often a period of high incidence of diseases, such as shrimp farming. If the breeding cycle can be shortened, the risk of disease will be greatly reduced, thereby improving the overall farming efficiency. Feed cost is affected by both feed coefficient and feed price. The formula for calculating the feed cost of aquatic products per unit weight is: unit price of feed (yuan/kg) × feed coefficient. Sometimes the change of feed coefficient has a greater impact on the cost of aquaculture feed than The impact of changes in feed prices. Therefore, when choosing feed, we should start from the overall farming cost and farming benefits, pay attention to the farming cost per ton of aquatic product output, pay attention to the feed coefficient, and choose high-quality feed.
4. In terms of feed performance, it is necessary to choose high-quality feed, pay attention to the growth performance of aquatic animals after feeding the feed, pay attention to the feed coefficient, and how to ensure the health of aquatic animals. High-quality feed has the following characteristics: low bait coefficient, fast growth, and low disease incidence.
5, a few misunderstandings to pay attention to when choosing:
(1). Only pay attention to the price of feed when choosing, and deliberately pursue low-priced feed. Low-priced feed often compromises the quality of the feed, with a long growth cycle and high feed coefficient. Although the price of high-quality feed is high, it can shorten the breeding cycle, thereby reducing the risk of breeding and the cost of water and electricity management caused by the long cycle. In the middle and late stages of aquaculture, it is often a period of high incidence of diseases, such as shrimp farming. If the breeding cycle can be shortened, the risk of disease will be greatly reduced, thereby improving the overall farming efficiency. Feed cost is affected by both feed coefficient and feed price. The formula for calculating the feed cost of aquatic products per unit weight is: unit price of feed (yuan/kg) × feed coefficient. Sometimes the change of feed coefficient has a greater impact on the cost of aquaculture feed than The impact of changes in feed prices. Therefore, when choosing feed, we should start from the overall farming cost and farming benefits, pay attention to the farming cost per ton of aquatic product output, pay attention to the feed coefficient, and choose high-quality feed.
(2) It is believed that feed with high protein level has better breeding effect. This is a one-sided and unscientific point of view. Protein is only an important nutrient required by aquatic animals, not all of them. In the case of the same protein source, the growth effect of aquatic animals increased with the increase of protein level within a certain range, but the growth performance of aquatic animals did not increase or showed a downward trend when the protein level exceeded a certain level. Too much protein is a metabolic burden for aquatic animals. In addition, the quality of protein is determined by its amino acid composition ratio and quantity, and the amino acid composition of different protein sources at the same protein level is very different, resulting in large differences in growth effects. For example, fishmeal 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 quality of feed should be evaluated comprehensively by protein level, other nutrient levels and raw material sources.
