1, cleaning pool for disinfection

The pond should be cleaned and disinfected one week before the fry are put in. When cleaning the pond, spray water all over the pond with bleaching powder or quicklime to keep the average depth of the pond around10cm. The dosage depends on the efficacy: kill miscellaneous fish and clarify the water quality. The advantages of bleaching powder are similar to those of quicklime, which can kill enemy creatures and purify water at the same time.

Quicklime has the function of regulating water quality-changing pH value, and its calcium ions can provide mineral nutrition for algae in water and play a role in fertilizing water. However, quicklime is time-consuming and laborious to use, and alkaline ponds are not suitable for use, so it should be carefully selected in production.

2. Transfer water and fertilizer

The open bait for spraying is rotifers first, then cladocera and copepods, while the bait for zooplankton is phytoplankton, so fertilization and watering should be done three days before the fry enter the pond to cultivate zooplankton. The raw materials of fertilizer and water can be said to be varied, including rapeseed cake, pig manure and chicken manure, and water transfer printing products.

3. Put the fry in

At the end of April and May, when the water temperature reaches 65438 08℃, the water-sprayed seedlings can be put in. In terms of weather and time, you should choose a sunny night without wind and waves. At this time, the weather and water temperature are relatively peaceful.

Anti-stress drugs should be sprinkled three or four hours before feeding to improve the adaptability of fry. Considering the characteristics that fry gather around after release, anti-stress drugs should also be diluted from around to the middle. Special attention should be paid to opening the aerator before and after sowing.

4. Training food

After seven days, the fry can be trained with flour, and the fish has phototaxis, so it is necessary to install a light bulb beside the pond to lure the fish, and make a floating ring on the water surface with a sealed water pipe to prevent the waste of feed and the clumping of fry.

Food training should adhere to the three principles of timing, fixed point and quality determination, but quantitative is not necessary, because the long speed ratio is faster from spraying to summer flowers, so it is appropriate to eat eight points full, adjust the feed amount and change the feed particle size in time.