Winter Huang's clever method points
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July 09 13:21:47, 2025
Astragalus, also known as yellow trout, is a cold-blooded fish that adapts well to environmental changes. It thrives in water temperatures ranging from 15°C to 30°C. When the temperature drops below 10°C, its feeding activity significantly decreases, and it begins to hibernate. At this stage, proper wintering methods are crucial to ensure its survival.
One effective method is the **water overwintering technique**. The aquaculture pond should be maintained at a depth of 30–50 cm to keep the bottom water temperature above 0°C. If ice forms on the surface, it’s important to break it daily to prevent oxygen depletion and maintain water quality. This method helps the fish remain active and healthy throughout the colder months.
Another approach is the **dry pool wintering method**. Once the water temperature drops below 10°C, the pond should be drained, leaving the bottom slightly moist. A layer of rice straw, wheat straw, or corn stalks (about 30 cm thick) should be placed on the mud surface to provide insulation and protect the fish from extreme cold.
For more controlled conditions, the **indoor wintering method** can be used. When the temperature falls below 10°C, the fish are moved into an indoor pool or bucket. A mixture of 1 kg of astragalus root with 2 liters of water is often used to create a supportive environment. The water should be changed daily, and the room temperature should be kept between 2°C and 5°C to mimic natural winter conditions.
Lastly, the **plastic greenhouse wintering method** is suitable when water temperatures fall below 12°C. The plastic greenhouse should be set up with water levels slightly higher than the regular aquaculture level. The internal temperature should be maintained between 2°C and 8°C. During the warmest part of the day, ventilation holes should be opened to allow fresh air circulation. Proper ventilation is essential to avoid hypoxia and ensure the health of the fish.
These wintering techniques help Astragalus survive the cold season safely and effectively, ensuring better growth and survival rates for the next breeding cycle. By implementing these methods, farmers can optimize their aquaculture practices and reduce losses during the winter months.
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1) Fish meal is obtained by cooking, pressing, drying and milling fresh raw fish or fish trimmings. There are several types of fish meal in the market depending on the source of fish or fishery by-products used and on the processing technology involved. Fish meal is a more or less coarse brown flour.
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2.1) Fish stocks harvested specifically for this purpose: small, bony and oily fish such as anchovy, horse mackerel, menhaden, capelin, sandeel, blue whiting, herring, pollack…By-catches from other fisheries;
2.2) Trimmings and offal left over from fish processed for human consumption (unpalatable or fast spoiling)
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