How to efficiently cultivate the seedlings of grass carp

How to effectively cultivate the seedlings of grass carp? In order to effectively cultivate grass carp fry, we should do the following: Tangkou selection and disinfection, grass carp spray selection and scientific management methods.

Do well the selection and disinfection of Tangkou

1. It is better to choose rivers, streams or reservoirs with sufficient water sources, fresh water quality, high dissolved oxygen and non-polluting rivers, streams or reservoirs, with complete supporting facilities. the area of the pond is generally 1 mu, and the shape is rectangular from east to west. The location of the pond should be relatively open and flat, ventilated and ventilated, the light time is long, and the soil quality of the pond should be loam.

2. Lump quicklime is the first choice for medicine, and 150 kg / mu quicklime is used to disinfect bacteria, viruses and enemy organisms.

Selection of grass carp spray

The main results are as follows: 1. The most reliable way is to directly test the quality of the spray, remove the spray temporarily raised in the cage from the hatching ring, and take out a basin to observe carefully in the downwind of the cage. The body color of the good spray is normal, the horizontal swimming is fast, the movement is free, and there is no deformity.

2. Usually about 13 days after disinfection, it is the best time to put spray. In addition, the water temperature of the pond and the temperature of the seedling should not exceed 3 ℃, otherwise, the seedling loading equipment should be put into the pond, and only when the temperature is basically the same, can you rest assured to put it into the pond.

Scientific management method

1. The eating and activity of fish fry can be observed everywhere around the pond, and the whole situation of the pond can be grasped timely and accurately.

2. It is necessary to try every means to create an environment suitable for splash life within one week. If the color of the water has faded and there is little plankton, you should throw more soy milk or manure in time.

3. Feed an appropriate amount of artificial soybean milk and other feed, usually once in the morning and once in the afternoon, and gradually increase the amount of feed with the growth of fish fry. In addition, cultivate fertilizer and water to breed a large number of natural bait. After about 10 days of cultivation, some of them have begun to change their eating habits. At this time, some Pingsha and duckweed should be fed appropriately. The green fodder should be clean and fresh, and the disease should be strictly prevented from entering the mouth. At the same time, the dissolved oxygen in the pond was closely observed. When the anoxic floating head in the pool is serious, new water should be injected in time. In the case of muggy weather, there are sudden thundershowers, convection of the upper and lower layers of water in the pond, a large amount of residue surging to the surface from the bottom of the pond, and fish fry dieting or basically stopping feeding. This situation can easily induce flooding ponds. In this case, immediately inject new water or turn on the aerator.

4. After about a month of cultivation, the feeding habits of fish fry have already been changed, and the specifications are all 3cm to 4cm. At this time, it is summer fry. Except for some sales, it must be managed in separate ponds, leaving only about 10,000 summer flowers per mu to continue to be cultivated until winter and spring. In the first 2 days of dividing the pond, it is necessary to exercise the adaptability of pulling the net, and the operation should be brisk and agile to reduce man-made plane injuries.

5. In terms of disease prevention, it is generally carried out according to the conventional disinfection method. After autumn, bait is given once in the morning and once in the afternoon. After several months of careful breeding to winter, the fry basically reached 10 to 20 centimeters, entering the winter, the temperature is very low, such as temporarily do not release, put the fish and winter in a deeper pond, waiting for spring release.