Technique of mixed culture of turtle, crab, shrimp and fish

1. Pond conditions: the pond area is 3.5 mu, the bottom is flat, the silt is about 15 cm thick and the water depth is 1.5 meters. The pond is surrounded by a 40-centimeter-wide glass fence equipped with a 1.5 kilowatt water wheel aerator.

2. Clean the pond with fertilizer and water: dry clear the pond with 75 kilograms of quicklime per mu and expose it to the sun for 5 days. One week before seedling release, the water was 80 cm deep, and Feishuibao and EM were used to enrich the water quality, so that the transparency of the water was about 30 cm, and the water color was tan or yellowish green.

3. Seedling stocking: a total of 175000 Penaeus vannamei seedlings with a body length of 0.7-0.8cm were released on May 20. One week later, 35 bighead carp and 175 silver carp with a weight of 250 grams were released. A total of 1050 wild soft-shelled turtles weighing only 200g to 300g were acquired in June. At the end of June, a total of 300 Chinese mitten crabs were released per kilogram.

4. Feed feeding: ⑴ Chinese soft-shelled turtle and Penaeus vannamei feeding: early feeding of South American white shrimp with 44% crude protein content, and after June, all feeding South American white shrimp feed with 40% crude protein content. Feed three times a day, with 30% of the day's feed at 7 am, 30% of the day's feed at 03:30 and 40% of the day's feed at 7 p.m. The daily feeding rate is 2-4%, and it is generally appropriate to eat in 90 minutes. Feed evenly along the shallow water at the edge of the pool. ⑵ crab feeding: from June to August, small mixed fish were fed, supplemented with corn, @ # @ 245fish, pumpkin, etc., twice a day, once a day at about 9: 00 a. M., the amount of feeding was 1: 00 in the whole day, and at about 5: 00 in the afternoon, the feeding amount was 2x3 in the whole day. In the later stage, small miscellaneous fish, corn and pellet feed were given priority to, with appropriate amount of green feed.

5, water quality control: enter June, add water 10-15 cm a week, until the water depth is 1.5 meters. Change the water every 20 days in the high temperature season, 40 cm each time. According to the weather conditions, turn on the aerator at the right time, use EM bacteria to divert water after changing water to avoid "bloom" phenomenon, and the transparency of pool water is controlled at 25-35 cm.

6. disease prevention and control: florfenicol mixed feed is fed once a month in the process of breeding, adding 1 gram of florfenicol per kilogram of feed for 3 days. After feeding the bait, sprinkle it with chlorine dioxide or povidone iodine in the whole pool once.