In addition, there was a period of large-scale fish stocking. In previous years, many fish farmers noticed that 2 to 7 days after releasing fingerlings, some "cold" fish would appear on the surface of the ponds. These sick fish had dull skin, excessive mucus, severe paralysis, and eventually died. The fingerlings were usually moved directly from the nursery ponds to the adult fish ponds, which often caused temperature shock due to the difference in water temperatures between the two locations. To address this issue, the author shares two effective methods—physical and medicinal—to prevent fish from suffering from cold stress during transfer. These techniques are also applicable for preventing colds during summer and autumn fry stocking, with good results and no adverse effects on the fish.
**Physical Method**:
To reduce temperature shock, a cage should be placed in a corner of the adult fish pond beforehand. When the temperature difference between the fish pond and the adult pond exceeds 3°C, the temperature should be gradually adjusted. Once the fish have acclimated, they can be introduced into the adult pond. This is done by adding water from the adult pond into the transport tanks or live water boats where the fish are kept. When the water temperature in the tank is close to that of the adult pond, the fish should be left for 10 to 30 minutes before being slowly released into the cage. This allows them to adjust to the new water conditions. After staying in the cage for 1 to 1.5 hours, the fish can then be safely moved into the adult fish pond.
**Drug Method**:
Due to the fact that adult fish ponds are typically deeper and therefore colder than nursery ponds, garlic combined with urea has long been used as an effective treatment to prevent cold stress. It is safe and has no side effects. For every 500 kg of fingerlings, 1.3 kg of garlic juice is added to the water. After the fish are placed in the transport tank or live water boat, 2.5 kg of urea is wrapped in a cloth and allowed to sink to the bottom of the container. This should be done once the water temperature in the tank approaches that of the nursery pond, ensuring a smooth transition and reducing the risk of cold shock.
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