The spring season is a critical time for goldfish care, focusing on insulation, proper feeding, and disease prevention. When the temperature rises to around 10°C, it's the ideal time to "take the fish out of the pot," which helps them recover from winter dormancy. With careful management, their health can bounce back quickly. However, strong winds can be harmful. After hibernation, goldfish are more vulnerable. Poor care during this period can lead to high mortality. To maintain warmth, use as much "old water" as possible. When cleaning the tank, remove all dirt and replace it with clean, green water. Before moving the fish, temporarily remove the middle layer of old water, clean the tank thoroughly, and then return the same old water. Add new water up to 30 cm and place the fish in a safe area. The purpose of using old water is to provide insulation and help with nutrition. Also, avoid excessive exposure to sunlight to keep the water temperature stable.
Feeding should be done carefully. Observe the color and amount of waste each day to adjust the next day’s feeding. Once the fish show good digestion and appetite, gradually increase the food to support growth. Disease prevention is crucial during this time. When moving the fish, change the water once, but after that, minimize water changes and movement. Weak fish are easily stressed by sudden changes. It's best to do localized water changes. When handling fish, use a net gently and move in the direction they're facing. Avoid chasing them, as this can cause stress and injury. For larger females about to spawn, ensure they are kept in stable conditions. Avoid overfeeding or sudden water changes, as these can trigger early spawning and potentially cause complications.
Summer is the peak growth season for goldfish, but temperatures can rise to 37–38°C, making water temperatures exceed 30°C. At this time, oxygen deficiency and "hot-tail" syndrome are major concerns. To prevent heatstroke, raise the water level to 35–40 cm so the fish can stay in cooler areas. Regular cleaning, frequent water changes, and shading help control temperature, maintain oxygen levels, and reduce algae growth. After rain, even if the water isn’t old, completely replace it. Rainwater cools the surface, causing convection that stirs up debris and speeds up water degradation. This can lead to issues like floating or cloudy water. Goldfish may eat more, but overfeeding is risky. Dead fish should not be left in the water, as they harm water quality. Summer is also a time for diseases like fin rot, white spot, or ulcers. Early isolation is key to preventing outbreaks.
Fall is another important season for goldfish, as temperatures remain suitable for their activity. Focus on feeding them adequately and increasing protein and fat content in their diet. As long as they are eating well, feed them as much as possible to promote healthy growth and prepare for winter. As temperatures drop, extend the interval between water changes compared to summer. Use "old water" methods where possible and gradually reduce cover time at night.
Before winter, prepare a dedicated goldfish room for hibernation. A south-facing, sheltered space with good light and heating is ideal. Ensure access to electricity and water, and have movable curtains for nighttime coverage. If possible, a semi-underground room is better. When temperatures approach 0°C, move the fish indoors into tanks or pots. Maintain an indoor temperature between 2–10°C. During this time, goldfish become less active and eat little. Focus on cold protection, minimal disturbance, and maintaining clean, disease-free water. Water changes and cleaning should be done sparingly—once a month for water changes and every two to three days for cleaning. Minimize handling to prevent injuries and the spread of diseases like white spot. Winter diseases are hard to treat, so prevention is essential.
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