Jinxi: High-yielding cultivation techniques for fry

In late April of each year, Jinxi County is in the stage of raising fish fry, how to do a good job of fry cultivation, obtain strong seedlings and high yield and high efficiency. The main cultivation techniques are as follows:

First, apply base fertilizer

After clear pond disinfection, 5-8 days before the fish ponds, sufficient base fertilizer is applied to cultivate rotifers in the pond so that there are sufficient feeds after the fish ponds. Generally, 250-350 kg of fermented manure is applied per acre.

Second, the production of milk

Soak soybeans with water to the gap between the watercress. Flattening, soaking time is too long will affect the pulp rate. When the grinding water and soybeans are added evenly, do not grind the milk after adding water, otherwise it will precipitate. 2.5-3 kg of soybeans can be ground into 50 kg of soybean milk. The ground soybean milk was fed in time.

Third, milk feeding

Within 5 days after the fish seedlings lay, they mainly feed on rotifers. 3 hours down the pond should be poured soy milk, pay attention to the following four points when feeding: (1) feeding methods: every morning, noon, afternoon, one vote. Because the soybean milk is not suspended in the water for a long time, it requires light and uniform when the slurry is poured, and the whole pool is mist-like and evenly spilled. Green and grass carp are used to foraging in the shallow waters near the pond. Therefore, the main raising greens, grass carp seedling ponds or grasses, blues, squids, and polyculture ponds should be splashed around the pond first, and then the whole pond should be splashed to make all the fry. All food can be eaten, and the amount of the feed is about 16-20 kilograms of soymilk per acre. In the first 6-9 days after the fry hatching, the larvae and other branching larvae feed on the larvae. Each day, it is necessary to sprinkling the soybean milk twice, that is, from 8 to 10 am and from 2 to 4 pm each time, each time the amount of soya mash can be increased. To 30-50 kg. (2) Soymilk feeding should be combined with feeding concentrated feed and top dressing. At the same time as splashing soy milk, you can choose to top up the manure in a sunny morning. The amount of 100-150 kilograms of mu should be used to splash the whole water. In the 10th to 15th days after the fish fry, the plankton in the pond is gradually reduced due to consumption. It is difficult to meet the needs of fry growth. At this time, in addition to soymilk, it is still necessary to feed the concentrate, which can be daily Each mu of dry cake powder 1.5-2.5 kg. If the rearing carp, carp seedlings, during this period should be treated depending on the water quality of a topdressing, generally using fermented manure dung 10-150 kg. After 15 days of fry cultivation, it can grow into the summer flower specification. At this time, it should be cultivated in ponds. Before the sub-pool, the net should be trained 2-3 times, and the feeding amount of the cake powder should be increased. kg. (3) Reasonably adjust the feeding amount. The amount of soymilk fed to the fry pool is determined by the size of the pool, not by the number of fry. The first few days of fry under the pool, 20-30 kilograms of soybean milk per acre per day, depending on the color and the speed of growth and adjustment of fry. When feeding, it is best to choose sunny weather. In case of heavy rain, it must be stopped after the rain stops. When fry floating head, feeding should be stopped. When the floating head is severe, new water should be added properly to prevent the pan from being returned to normal after the fry is returned to normal. (4) Strengthen daily management. First, before releasing the seedlings, we must disinfect clear ponds and remove enemy predators. The second is that the milk is fresh. The third is to constantly add new water to the pool in a timely manner and in phases to prevent and treat fish diseases and eliminate hidden dangers. This will provide a good internal and external environment for the growth of fry.

IV. Disease Prevention

About 7 days after frying, the seedlings can be harvested for microscopic examination. At this time, there may be a large amount of trichothriasis on the surface, and a microscopic examination will be conducted about half a month to prevent parasites from parasites. Once parasites are found, It must be promptly killed by insecticides in the Quanchipai, and repeated every other day. The fry can be splashed with chlorine dioxide once a month or so. Special attention should be paid to avoid misdiagnosis of parasites as white head and white beak disease. Always use microscopy to take medication. This prevention of fish disease can ensure the survival rate of fry.

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