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Detailed Explanation of Key Technical Points for Polyculture of Soft-shelled Turtles, Crabs, Shrimp and Fish

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1. Pond conditions: The pond area is 3.5 mu, the pond bottom is flat, the silt thickness is about 15 cm, and the water depth is 1.5 m. A 40 cm wide glass fence is installed around the pond, equipped with a 1.5 kW paddlewheel aerator. 2. Pond clearing and water fertilizing: After clearing the pond by the dry method with 75 kg of quicklime per mu, expose it to the sun for 5 days. One week before releasing the seedlings, fill with water to a depth of 80 cm, and use Feishuibao and EM original liquid to fertilize the water quality, so that the water transparency is about 30 cm and the water color is tea-brown or yellow-green. 3. Seedling stocking: On May 20, a total of 0.7-0.8

1. Pond conditions: The pond area is 3.5 mu, the pond bottom is flat, the silt thickness is about 15 cm, and the water depth is 1.5 m. A 40 cm wide glass fence is installed around the pond, equipped with a 1.5 kW paddlewheel aerator.

2. Pond clearing and water fertilizing: After clearing the pond by the dry method with 75 kg of quicklime per mu, expose it to the sun for 5 days. One week before releasing the seedlings, fill with water to a depth of 80 cm, and use Feishuibao and EM original liquid to fertilize the water quality, so that the water transparency is about 30 cm and the water color is tea-brown or yellow-green.

3. Seedling stocking: On May 20, a total of 175,000 whiteleg shrimp (Litopenaeus vannamei) seedlings with a body length of 0.7-0.8 cm were stocked. One week later, 35 bighead carp (Aristichthys nobilis) with an individual weight of 250 g and 175 silver carp (Hypophthalmichthys molitrix) were stocked. In June, wild Chinese soft-shelled turtles (Pelodiscus sinensis) weighing 200-300 g each were purchased, and a total of 1,050 were stocked. At the end of June, a total of 300 Chinese mitten crabs (Eriocheir sinensis) at 16 per kg were stocked.

4. Feed feeding: (1) Feeding of Chinese soft-shelled turtles and whiteleg shrimp: In the early stage, whiteleg shrimp feed with a crude protein content of 44% was fed, and after June, all were fed whiteleg shrimp feed with a crude protein content of 40%. Feed 3 times a day: at 7 a.m., the feeding amount is 30% of the whole day's feeding amount; at 3:30 p.m., 30% of the whole day's feeding amount; and at 7 p.m., 40% of the whole day's feeding amount. The daily feeding rate is 2-4%, and it is generally advisable to finish eating within 90 minutes. Feed evenly along the shallow water area at the pond edge. (2) Feeding of river crabs: From June to August, feed small trash fish, supplemented with corn, @#@245@#@, pumpkin, etc., feeding 2 times a day, once at about 9 a.m. with an amount of 1/3 of the whole day, and once at about 5 p.m. with an amount of 2/3 of the whole day. In the later stage, mainly feed small trash fish, corn, and pelleted feed, with an appropriate amount of green feed.

5. Water quality regulation: Starting in June, add 10-15 cm of water every week until the water depth reaches 1.5 m. In the high-temperature season, change the water once every 20 days, 40 cm each time. Turn on the aerator in a timely manner according to weather conditions. After changing the water, use EM bacteria to regulate the water to avoid the occurrence of "water blooms," and control the pond water transparency at 25-35 cm.

6. Disease prevention and control: During the breeding process, feed florfenicol mixed with feed once a month, adding 1 g of florfenicol per kg of feed, for 3 consecutive days. After feeding the medicated bait, splash the whole pond once with chlorine dioxide or povidone-iodine dissolved in water.

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