How much is the profit of raising crayfish per mu?

According to the farmed shrimp 120kg per mu, the number is 120kg/ mu *22/mu =2640/mu, and the ratio of male to female shrimp is 1: 1, each 1320. If the loss in transportation is calculated as 5%, the number of female shrimps per mu is 1254. 56 yuan per catty of each kind of shrimp, shrimp raising cost 120*56 yuan =6720 yuan.

2. Shrimp farming income

The total number of young shrimps produced after one year of lobster culture per mu is: per mu 1254 * twice per mu. Year *200/ mu = 50. 1.6 million/mu. Year. The survival rate of shrimp species from spawning to young shrimp is 8%-30%. According to the lowest calculation, the total number of adult shrimps per mu per year is 50 16000*8%=40 128. Year. After laying eggs and feeding for 2-3 months, it can be put on the market for sale. Each adult shrimp weighs about 50g, and the annual output per mu is 40128 ÷10/kg = 4012.8kg/mu. Year. So the gross profit per mu is 40 12.8* 10 yuan/kg =40 128 yuan/mu.

3. Profit from shrimp farming

Net profit = gross profit 40 128 yuan-shrimp breeding cost 6720 yuan-feed and other expenses 2880 yuan =30528 yuan. Therefore, the theoretical profit value of one mu of shrimp culture is 30528 yuan. If 10 mu shrimp needs 1000 yuan/mu. Labor service and pond lease year, and the salary of labor service is 13000 yuan/year. 10 mu shrimp farming income is 30528-13000-1000 =16528 *10 =165280 yuan.

4. Matters needing attention in shrimp culture

① Choose a good feed. In the selection of special feed for prawns, priority should be given to the selection of high-quality feed from regular manufacturers to improve the utilization rate of feed and ensure the healthy and rapid growth of prawns. In the later stage, enough biological feed can be cultivated, and young shrimp can put fresh feed and special feed, and then gradually transition to special feed for shrimp.

(2) The general principle of reasonable feeding shrimp is to feed shrimp in small amounts for many times, so that neither too much feeding will cause feed waste nor too little feeding will affect the normal growth of shrimp. At the same time, the feeding amount depends on the weather. If the water temperature is lower than 18 degrees or higher than 32 degrees, feed less shrimp. When the water temperature is between 25-30 degrees, shrimp will grow vigorously and have a large demand, so it can be fed more.

(3) To maintain good water quality, shrimp culture needs good water quality conditions. With good water quality, shrimp can grow well and get sick less. Therefore, the water should be changed every 10 day, and the water should be changed by about 30% each time.