Daily Detection of Shrimp during Culture period

Technicians should patrol the pond once a day in the early morning and evening to carefully observe the changes of the environment, water color and safety of shrimp activities, and keep records. The main contents of the detection are as follows:

1. During the cultivation period, viral pathogen detection should be done frequently, and Tmure staining method and nucleic acid probe can be used. PCR and other methods.

two。 Remove crabs and rats around shrimp ponds. Strictly prevent the discharge of dead shrimp and sick shrimp from other shrimp ponds.

3. Measure water temperature, dissolved oxygen and other water quality elements. Measure the minimum and maximum water temperature before sunrise and 16:00 every day. Measure the dissolved oxygen and pH value in the pool. The transparency is measured once a day, the salinity of the pool water is measured irregularly, the species and quantity of plankton in the pool are often detected, and the changes of other water quality elements such as ammonia nitrogen can be detected if conditions are available.

4. Observe the activity and distribution of prawns.

5. Pay attention to find sick shrimp and dead shrimp, fish out sick and dead shrimp in time. Check the cause of death, there are conditions can often detect the number of pathogenic vibrio in the pool.

6. The growth of Penaeus vannamei was measured every 10 days. The body length and body weight of prawns can be measured. The body length of prawn refers to the length from the base of the eye stalk to the end of the tail segment, with no less than 50 random samples per measurement. Measure the body weight of not less than 50 prawns, weigh the total weight at one time, and then calculate the average tail weight.

7. The feeding and feed utilization of prawns were observed.

8. Regularly estimate the tail number of prawns in the pond, 3-6cm shrimp can use a known area of the small lifting net, many times in the pond to carry shrimp, based on experience to estimate the number of prawns. Prawns with body length above 6Cm can be quantified by spinning net. Multiple nets were cast in the pond and sampled according to the distribution of prawns in the pond. According to the number of shrimps caught, use the following formula. Find out the number of shrimp in the whole pond.

9. Pay attention to the safety of gates, ditches and pond dams. Whether the aerator runs normally or not, pay attention to the safety of electricity in thunderstorm days.