"Two-Stage Law" High Density Cultured Black Pelican

First, pond preparation Pond sediment is best sandy soil. Raise the height of 0.5 meters around the pond with bricks, fences or plastic nets to prevent the blackbird from escaping. The depth of the pond should be about 2 meters. The water should be sufficient, fresh and pollution-free, neutral or alkaline, and the water temperature should not exceed 30°C. Fish ponds are suitable for 500 square meters to 1000 square meters, adult fish ponds 2000 square meters to 4000 square meters is appropriate, it is best to use micro-fluid culture. The water injection hole is located at a height of 30 cm above the water surface of the pool wall to prevent the Umbellaria from running back against the water during the water injection.
Before stocking, the pool water should be drained to remove some silt and keep the mud thickness about 20 cm. Then clear lime ponds were disinfected with about 100 kg of lime per acre pond.
In addition, Ukrainian people have a habit of “enriching themselves”. After eating, they find a hidden place to hide and rest. It is possible to plant 1/5 of water plants such as water lotuses and water peanuts on the surface of the pond to ensure the hiding of the fish body, thereby reducing the blackbird. The number of activities reduces its energy consumption and increases the growth rate.
Second, the species stocking in the middle and early September, the average tail weight of 40 grams of Wuling seedlings to strengthen the cultivation, so that in 8 months or so grow into 150 grams of large-scale species of Wuyi species, stocking density of 7500 per mu. The second stage of stocking in the early May of the following year, the large-scale fish species cultivated in the first stage will be put into adult fish ponds for intensive breeding. The stocking density will be 4000 to 4500 per mu.
Third, the bait feed The current source of bait is mainly live bait (small tilapia, small river fish, wheat ear, loach, shrimp, etc.) and artificial compound feed. High-density intensive cultured black tadpoles must acclimate their ingested artificial compound feeds and begin domestication from seedlings. The method is to make pellet feed by mixing together 80% ground minnow fish meat and 20% flour or other binders. At the beginning of domestication, the feed can be mixed with the leeches and gradually reduce the number of live leeches such as leeches, until they are not leewed at the end, and they are all fed with artificial pellet feed. Crude protein content of pellets should be above 40%. Every day from 7 am to 8 pm and from 17 pm to 18 pm, they are fed one at a time. In the season when the fish grows vigorously, the amount of fish fed is 8% to 10% of the weight of fish and 5% to 6% of other seasons. The actual amount of feeding depends on the season, weather, fish activity, and eating conditions. The feed can be placed in a basket and lifted into a pond for feeding.
Fourth, the water quality adjustment Another key to the cultivation of Chinese wolfberry is "water conservation." The quality of water directly affects its growth. Due to the high density of intensive culture pools, the water quality is easily deteriorated. Therefore, new water should be changed frequently. New water should be changed between 3 and 5 times a month, and the water change volume should be 15 cm to 20 cm. In summer, the water temperature is high, and the number of water changes can be appropriately increased. It is better to keep the micro-flowing water. The water transparency of the pool is maintained at about 30 cm.
5. Prevention of Fish Diseases The bleaching powder 210-6 will be sprayed on a monthly basis, or the "Korax Killing" 0.310-6 will prevent fish diseases.
Sixth, timely fishing Wucha specifications to reach more than 500 grams can be caught on the market. If only part of the fish is harvested, in addition to pulling the net, new water can be poured into the pool according to the characteristics of the black clam water, and a fish net can be set at the outlet to allow it to be caught in the net. If you catch it all, you can drain the pool and use a pusher to pull the black peony out of the mud.

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