With the continuous expansion of the South American white shrimp aquaculture industry scale, more and more seed brands and manufacturers, and the quality is uneven, in order to avoid losses, the introduction of several commonly used methods for quality identification of shrimp seedlings for reference. 1. Visual observation of the viability of shrimp: (1) Look at the swimming speed and the swinging force of the swimming foot. If the swimming speed is faster, the swing of the swimming foot is more powerful, then the vitality is better, but the vigor is worse. (2) Observe the water repellency by taking a round container (such as a white water scoop), putting the shrimp and water into it (not too much shrimp), stirring the water to turn, and if the shrimp seedlings are swimming against the water, then Vitality is good, if a lot of drift or sink in the middle, the vitality is poor. (3) Take a hundred or so shrimps in a wet towel, and let them stand for 10 minutes to 15 minutes to check their survival rate. The higher the survival rate, the better the quality of the shrimp, and the lower the survival rate, the lower the quality of the shrimp. 2. Identify the shrimp's anti-stress ability by naked eyes: Take pure fresh water, put the shrimp seedlings into it, observe the survival rate after half an hour (if the salinity of the shrimp itself is already very low, the time should be appropriate Extended), the higher the survival rate of shrimp seedlings, the stronger the anti-stress ability of shrimp seedlings, and the weaker. 3. Visually observe the transparency of the shrimp body. If the shrimp seedlings have good transparency, there is no phenomenon of muscle turbidity, and there is no attachment on the body surface, then the shrimp seedlings are relatively healthy. Otherwise, they should be observed further. 4. Visual observation of whether the shells on the heads of the shrimps did not fade, and if so, it indicates that the shrimps have weaker constitutions. If not, it indicates that the shrimps have better constitution. 5. Observe the hepatopancreas and intestines of the shrimps by naked eyes. If they are full, dark in color and similar in color to the food (red for red shrimp, black for black shrimp), more than 1/2 full in the intestine. It indicates that the feeding condition of the shrimp seedlings is very good. If the color of the hepatopancreas is shallow and the intestinal tract is empty, it indicates that the feeding condition is poor and the shrimp seedlings may have problems. Note: When the shrimps have just finished their shells, there is no food in the intestines, but the hepatopancreas is still full. This is a normal phenomenon. 6. Look at the “fat lean†of shrimp seedlings, which is the ratio of muscle to bowel in professional jargon. The more "fat" the shrimp seedlings, the better the nutrition of the shrimp seedlings, and vice versa. However, it should be noted that the gut of the shrimp muscle is often related to the characteristics of the shrimp species and cannot be generalized. 7. When the shrimps are finished and put the seedlings into the pond, observe with a transparent glass. If many pod shells are found, it indicates that the shrimps have poor anti-stress ability, otherwise they are strong. 8. Visually observe the size and uniformity of the shrimp seedlings. Shrimp seedlings generally have a size of about 1 cm, and require relatively neat and uniform seedlings. However, there is a relatively large difference in the size of some generations of seedlings, but the difference in size after breeding for a period of time will become very small and cannot be generalized. The above introductions are all visual observations and cannot guarantee the quality of the shrimps. Therefore, it is best to use microscopes, bacteria culture plates and other instruments for further observations to ensure the quality of P. vannamei seedlings. anabolic steroid green pill,anabolic steroid tablets labeled,anabolic steroid tablets que es,anabolic steroid tablets reddit Shaanxi Kang New Pharmaceutical co., Ltd. , https://www.kangnewpharmas.com
Inspection of shrimp quality