At present, it is the crucial period for fry breeding into summer fish species. It is necessary to cultivate fertile and well-established summer fish species and improve the survival rate of fry cultivation. The majority of farmers must do the following:
First, do a good job of pre-release preparations. The pond water will be drained (smoked) about 10 days before the fish will be unloaded. The excessive silt and weed will be removed, and 150 kg of water per acre will be used to disinfect the water to remove wild fish and predators. About one week after the clear pond is filled with 50-60 centimeters of water, 150 kg of fermented manure is applied to the pool to breed a proper amount of natural food for the fish to eat enough palatability food.
Second, feed feeding technology: intensive fine feeding is the key to improving the survival rate of fry, fry on the pool from the day the whole pool splash soy milk, to supplement the lack of natural food, usually every day, the middle and afternoon feeding 1 time, along Sprinkle around the pond. When the fry grows to 2 centimeters or so, they are fed twice a day, around 9 am and around 4 pm, and gradually reduce the amount of soya-bean milk fed to feed the rapeseed cake. Special attention should be paid to reducing the amount of feeding on a cloudy day. The amount of feeding should be timely adjusted according to the weather and water quality. The amount of feeding should be increased, water quality should be deteriorated, fish diseases are easily caused, and the amount of fish fed is small, affecting the growth of fry.
Third, water quality management techniques: fry adaptability to the environment is poor, the requirements of the water environment more stringent than the adult fish, so the management of fry breeding water quality is particularly important, fry after the initial pool, every 3-5 days must inject new water into the pool Once, each injection of water 10-20 cm, the inlet should be blocked with a dense network. At the same time, it is necessary to start the aerator in a timely manner, especially if the fish is just under the pool for a few days, the boot time is relatively longer.
Fourth, fish disease prevention and control technology. The fry cultivation stage is mainly prevention. The common fish diseases are bubble disease and horse disease. It is necessary to pay attention to clearing debris in the pool and weeds in the pool, reasonably control the amount of feed, and strengthen water quality management. Adhere to the patrols once in the morning, evening and evening, observe the activities of fish fry, and find that problems are solved in time.
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