1. Observe water conditions, dissolved oxygen and other water quality elements, and measure dissolved oxygen and PH value in the pool before sunrise and 16 every day. It is best to measure the transparency once a day, and often check the variety and quantity changes of swimming creatures in the pool. If conditions permit, the changes of other water quality factors such as ammonia nitrogen can be detected.

2. Observe the activity and distribution of prawns;

3, to regularly check the shrimp, pay attention to find sick shrimp and dead shrimp, timely remove sick shrimp and dead shrimp, check the cause of death;

4. Measure the growth of prawns every 10 day. It can measure the length and weight of prawns. The length of prawns refers to the length from the base of eyestalk to the end of caudal segment, and at least 50 prawns should be randomly selected for each measurement. No less than 50 prawns can be caught by weight measurement, the total amount can be weighed at one time, and then the average tail weight can be calculated;

5. Observe the feeding and feed utilization of prawns;

6. Regularly estimate the mantissa of prawns in the pond. Shrimp of 3-6cm can be lifted in many places in the pond with a small lifting net of known area, and the mantissa of the pond can be estimated by experience. For shrimp over 6cm in length, it can be quantified by rotating net. Draw nets at multiple points in the pond and take samples according to the distribution of shrimp in the pond. According to the number of shrimps caught, the number of shrimps in the whole pond is calculated by formula;

7. Pay attention to the safety of gates, ditches and dams, whether the aerator works normally, and pay attention to the safety of electricity consumption in thunderstorm days.

Second, feeding is very important

1, putrid or toxic bait should not be fed, and plant bait with low titer should be fed less;

2, pond water and fertilizer, ponds rich in bait organisms should be fed less, and ponds with less water and bait organisms should be fed more appropriately;

3. When the water temperature is higher than 30℃, feed less and throw more; Feed more when the wind is warm; When storms and cold currents strike, you should feed less or not for the time being;

4. Feed prawns less on the day when they molt a lot (it can be reduced by about 20%), and feed them more appropriately two days after molting;

5. When there are many competing organisms in the pool, they should be fed more appropriately;

6. The size differentiation of prawns in the pond is serious and uneven, which may mean that there is a long-term lack of bait and should be fed more appropriately;

7. When the water quality deteriorates or there is hypoxia floating head, feed less or even stop feeding temporarily, and feed normally after taking measures to improve the water quality;

8. Dispersed feeding is better than centralized feeding; It is better to feed a variety of bait alternately than to feed a single bait for a long time.