Bags that are transported in oxygen by air in plastic bags often contain more carbon dioxide. In particular, long-distance transport of fry, high concentrations of carbon dioxide in the blood, can make the fry in anesthesia and even coma (visually observed, most of the fry in the bag can be seen playing bottom). If this kind of fry is put into the pond directly, the survival rate is extremely low. Therefore, any fish fry that have been transported over long distances must first be cooled down and then restocked.
When the fish fry under the pond, the oxygenated fish fry in the plastic bag should be put into the fish pond to cool down. Usually it takes about 15-30 minutes. When the temperature difference between the water temperature inside and outside the bag cannot exceed 3°C, that is when the oxygen temperature inside and outside the oxygen bag is basically the same, then open again. The plastic bag mouth is slowly placed into cages pre-arranged in the fish pond for raising, so that the water in the pool is gradually mixed with the water in the bag, so as to adjust the temperature difference and the adaptability of the fry to the air pressure in the bag, that is, “slow seedlingsâ€. When holding the cage, the pool water should be often moved outside the cage to increase the dissolved oxygen in the water inside the cage. Normally held for 0.5 to 1.0 hours, excessive carbon dioxide in the fry's blood has been discharged, and the fish fry swim in the cage against the water. If the fry is directly poured into the pool from the bag, the mortality of the fry is very high.
After the fry is raised, it is necessary to splash duck yellow water or egg yellow water. After the fry were eaten, the fish could be seen with a white line in the fish body. Duck eggs or eggs need to be boiled in boiling water for more than 1 hour. The older the better, the better is the protein foamer. Take the egg yolk and mix it into several pieces, wrap it in a double gauze and rinse it inside the basin (can't squeeze it out by hand) to make the egg yolk water and splash it in the fry box. Generally, one duck egg yolk can feed 100,000 fish fry.
When fish fry under the pond, it faces two major problems of adapting to the new environment and obtaining palatability food as soon as possible. Feeding duck yolks or yolks in front of Xiatang so that the fry can be eaten and stocked in the lower pond is actually guaranteeing the first feeding of the larvae. The purpose is to strengthen the foraging ability of the fry under the pond and improve the fry environment. Adaptability. It has been determined that the ability of grass carp seedlings that satiety ponds and fasting ponds to endure hunger differs greatly. In the same manner, the fry hatched for 5 days, and the fry in the fasting pond fell to 50% by 13 days, while the satiety pond fish only died 2.1% at this time. Therefore, satiety fish ponds effectively improve the survival rate of fry.
It must be emphasized that the safe water temperature of the fry ponds must not be lower than 1-3.5°C. If the water temperature is low at night and the fry reaches its destination at night, the fry should be kept in an indoor container (40,000 to 50,000 fry per 50 liters of water), and the water temperature should be maintained at about 20°C, and the air should be increased. Oxygen to prevent fry floating head. After 9:00 am the next morning, when the water temperature rises, cast egg yolk again and adjust the temperature difference between the pond water temperature and then the lower pond.
When the fish fry under the pond, the oxygenated fish fry in the plastic bag should be put into the fish pond to cool down. Usually it takes about 15-30 minutes. When the temperature difference between the water temperature inside and outside the bag cannot exceed 3°C, that is when the oxygen temperature inside and outside the oxygen bag is basically the same, then open again. The plastic bag mouth is slowly placed into cages pre-arranged in the fish pond for raising, so that the water in the pool is gradually mixed with the water in the bag, so as to adjust the temperature difference and the adaptability of the fry to the air pressure in the bag, that is, “slow seedlingsâ€. When holding the cage, the pool water should be often moved outside the cage to increase the dissolved oxygen in the water inside the cage. Normally held for 0.5 to 1.0 hours, excessive carbon dioxide in the fry's blood has been discharged, and the fish fry swim in the cage against the water. If the fry is directly poured into the pool from the bag, the mortality of the fry is very high.
After the fry is raised, it is necessary to splash duck yellow water or egg yellow water. After the fry were eaten, the fish could be seen with a white line in the fish body. Duck eggs or eggs need to be boiled in boiling water for more than 1 hour. The older the better, the better is the protein foamer. Take the egg yolk and mix it into several pieces, wrap it in a double gauze and rinse it inside the basin (can't squeeze it out by hand) to make the egg yolk water and splash it in the fry box. Generally, one duck egg yolk can feed 100,000 fish fry.
When fish fry under the pond, it faces two major problems of adapting to the new environment and obtaining palatability food as soon as possible. Feeding duck yolks or yolks in front of Xiatang so that the fry can be eaten and stocked in the lower pond is actually guaranteeing the first feeding of the larvae. The purpose is to strengthen the foraging ability of the fry under the pond and improve the fry environment. Adaptability. It has been determined that the ability of grass carp seedlings that satiety ponds and fasting ponds to endure hunger differs greatly. In the same manner, the fry hatched for 5 days, and the fry in the fasting pond fell to 50% by 13 days, while the satiety pond fish only died 2.1% at this time. Therefore, satiety fish ponds effectively improve the survival rate of fry.
It must be emphasized that the safe water temperature of the fry ponds must not be lower than 1-3.5°C. If the water temperature is low at night and the fry reaches its destination at night, the fry should be kept in an indoor container (40,000 to 50,000 fry per 50 liters of water), and the water temperature should be maintained at about 20°C, and the air should be increased. Oxygen to prevent fry floating head. After 9:00 am the next morning, when the water temperature rises, cast egg yolk again and adjust the temperature difference between the pond water temperature and then the lower pond.
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