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How safe is the fry
Before introducing the fry into the fish pond, it's essential to test the effectiveness of the clear pond medicine. A group of dozens of fry were placed in cages within the pond for observation. After a half-day to full day, their activity levels remained normal, indicating that the medicine was still effective. However, after approximately seven days of clearing the pond, the efficacy of the treatment significantly decreased.
Prior to stocking the fry, it's important to conduct one or two clean-up sessions using a fine mesh net. This helps remove harmful insects, frog eggs, cockroaches, and any wild fish that may have appeared in the rear part of the pond. This step ensures a cleaner and safer environment for the fry.
Timing is crucial when transferring the fry into the pond. If introduced too early, the fry may be weak, have poor feeding habits, and lower survival rates. If introduced too late, they may already have absorbed their yolk sac, leading to weakness, weight loss, and higher mortality. The ideal time to transfer fry is when they are 4 to 5 days old, have developed a fully inflated swim bladder, and are actively swimming and feeding outside the egg.
Choosing a sunny pond is recommended for better fry development. Sunny conditions lead to higher water temperatures, which enhance fry vitality and support healthy growth. In contrast, rainy days can cause sudden temperature drops and unstable water conditions, reducing fry activity. During rain, fry often become stressed as they focus on staying in place rather than feeding, increasing the risk of death.
It’s also important to feed the fry before transferring them. To improve their health, 10,000 fry can be given 2 cooked egg yolks in the afternoon. The egg yolks should be wrapped in gauze, crushed, and washed into a fine suspension for feeding. The next morning, another feeding should be provided, and by noon, the amount can be increased to 4 egg yolks. This helps ensure proper nutrition and strengthens the fry before they are stocked in the pond.
When selecting fry, it's best to use those of the same species to avoid aggression or competition. On windy days, place the fry on the upwind side of the pond to prevent them from being pushed toward the edges where they might die. If the fry are transported from another location, especially in nylon bags, make sure the temperature difference between the bag and the pond water does not exceed 4°C. First, open the bag and submerge it in the pond for about 10–15 minutes until the temperatures equalize. Then carefully release the fry into the pond.