How should koi fish feed in winter?

It is cold in winter. When the temperature drops to 0℃, koi fish should be moved to indoor fish ponds for wintering. The indoor water temperature should be kept at 2℃ ~ 10℃, with emphasis on heat preservation, proper feeding and disease prevention. The wintering period in koi fish is 1 1 to March of the following year.

In the south, the temperature is suitable most of the time in winter, so there is no need to take special insulation measures for koi fish. However, the occasional cold air will also make the temperature change greatly, which will easily have a negative impact on koi fish.

Therefore, when encountering cold air like this at present, we should pay attention to windproof measures in the northern part of koi fish breeding grounds to avoid the influence of cold air on koi fish as much as possible. At the same time, the water level of koi fish Fish Pond can be appropriately deepened to keep the bottom temperature stable.

In the north, when the water temperature begins to drop in early 10, it is necessary to transfer koi fish fry from outdoor to indoor for heating culture, and the stocking density is 50 ~ 250 fish per square meter/kloc-0. The insulation room can be a plastic shed, which is suitable for houses in northern areas.

Generally, warm water is directly added to fish ponds in koi fish, but it is suggested that the hot water source with higher water temperature should be mixed with cold water for proper temperature adjustment before being added, so as to keep the water temperature as stable as possible at 22~28℃. The temperature is low at night, so it is particularly important to adjust the temperature. The frequency and time of adding water should be flexibly controlled according to the weather and water temperature.

Seasonal alternation is often accompanied by rainy weather, which easily leads to sudden changes in water quality and parasitic breeding. Therefore, it is necessary to disinfect fish ponds in koi fish.

In winter, the changeable temperature easily makes koi fish suffer from "cold disease". The fish showed abnormal activities, or swimming weakness, or staying at the edge of the pond, or jumping frequently, or rubbing against each other.

The above symptoms are mainly due to the sudden change of temperature, which koi fish has no time to adapt to, or the poor water quality caused by parasites. However, spraying sea salt into seawater to increase the salinity of aquaculture pond water to five thousandths can effectively prevent the "cold disease" in koi fish.

Koi fish is a cold-blooded animal. As the temperature drops, the feeding amount should be adjusted accordingly. If the water temperature is about 18 ~ 20℃ in early winter in south China, it can be fed 2 ~ 3 times a week. If the water temperature continues to decrease, the feeding amount should be reduced appropriately. If the temperature drops below 16℃, koi fish will start to stop feeding, so it is unnecessary to feed at this time.

When the water temperature is low, the oxygen-consuming bacteria in the water will decrease, and the digestive enzymes in koi fish's intestines will also decrease. Feeding koi fish too much can easily lead to indigestion. Although he won't die under normal circumstances, by the next spring, koi fish will only grow sideways and get fat, which will lead to ugly appearance.

Due to the decrease of feeding amount, koi fish's excreta is relatively small, which will not have a great impact on the water quality. Therefore, the time interval for changing water after winter is longer than before, mainly by supplementing new water.

In winter, if koi fish is injured, it is easy to cause water mold. But winter is often the peak season for sales in koi fish, and there are many fishing times in koi fish. A little carelessness will hurt the fish.

In this regard, when fishing for koi fish, you must gently pat the net against the direction of koi fish, which is accurate and fast, and it is not easy to hurt the fish. On the contrary, if the old net catches up with koi fish, and the net has resistance in the water, it will provide an opportunity for the invasion of germs to chase the easily injured fish, so try to avoid the fish from being injured due to careless operation.

Extended data:

Feeding characteristics in spring, summer and autumn

In spring, when the weather is warm and cold, koi fish begins to recover from hibernation, and the breeding moves from indoor to outdoor, but special attention should be paid to the sudden cooling, covering the film in time to keep the water temperature stable; Plant bait is the main food, and the dosage is gradually increased from less to facilitate the digestion and absorption of koi fish.

When the weather is hot in summer, it is necessary to cover the plastic sunshade net to prevent direct sunlight, and it is most appropriate to reduce the sunlight illumination from 8000 ~ 12000 lux to 5500 ~ 5800 lux.

In autumn, the weather is less rainy and sunny, and the water temperature drops obviously, which is most suitable for the growth of koi fish and can increase the proportion of animals (protein), such as silkworm chrysalis. Increase investment and promote rapid growth.

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