Eight fish into the pond attention

The fry is delicately body. When it is not in the pool, it may result in a large loss, or it will be completely destroyed. Therefore, the author specifically reminds farmers to pay attention to the following eight items when fish fry enter the pool.

1 The fry should be pulled several times on the day before entering the pool with a dense mesh. The empty pond should be fully dissolved on the one hand to prevent poisoning of the fry, and on the other hand, the enemy should be further removed. If the enemy is found to be available 0.5 g/m3 concentration of trichlorfon Quanchiposa spilled, this concentration does not kill rotifers.

2 Before the fish enter the pool, be sure to check whether the drug toxicity of the clear pond disappears, and if the water's fatness is suitable, firstly take half a bucket of water. Because sometimes the surface water toxicity has disappeared, the underlying virulence is still very strong. The fish fry were observed in the water for 8 to 10 hours to see if the life was normal. To determine whether the fry could enter the pond, the pH should be within the range of 7 to 8.5. Secondly, according to the water color, transparency and bait biological conditions to determine the water's fatness, such as the discovery of water, fertilizer, water can be added to the adjustment, the pool of water is not enough fat, should immediately apply a small amount of fertilizer or increase artificial feed.

3 When the fish fry enter the pool, the pool water temperature must not be lower than 3°C. If the water temperature difference is too large, the temperature difference should be gradually adjusted before the fish fry adapt to the pool. For fish fry transported in plastic bags, the opening of the plastic bag should be slowly put into a cage pre-placed in the fish pond before entering the pool. The water temperature in the pool is the same as that in the bag, so that the pool water is gradually mixed with the water in the bag. After 10 to 20 minutes, the fry with water is slowly poured into the box, so as to adjust the water temperature difference and the adaptability of the fry to the change of air pressure in the bag, and some people call it "slow seedling." If the fry was found to be in a supine position when the bag was opened, this is a phenomenon of carbon dioxide poisoning, as long as after the slow seedlings, put in clear water for a while to recover. Otherwise, if the fish is directly poured into the tank from the bag, even if normal observation of naked eyes is normal during stocking, death will occur after the lower pond, that is, after transport. Therefore, plastic bags to transport fry, into the pool to be particularly careful operation, slow seedling treatment is an essential and important step.

4 The fish should be disinfected before entering the pool. It can be soaked with 1% of baking soda for 20-30 minutes or 10,000 IU/L of penicillin solution for 1 hour.

5 Sticking to the practice of fry feeding in fry after feeding fry, it is proved that if the fry is fed with 1 to 2 boiled egg yolks or feed yeast before entering the pond, it would be better if the fry worms were fed and the survival rate or growth rate is better than non-feeding. There has been a marked improvement, so many places insist on fry feeding after the pond. After the fry arrives, feed it with cages and re-enter the pool. When the seedlings are taken in the cage, the fry heads are generally of a strong constitution and the individuals are larger. The shark's fry is of a poorer constitution and the individuals are smaller, so that the fry of the individuals with different size and body strength can be basically separated. In order to avoid individual large and strong fish in the feeding process, the small and weak fries are excreted, and gradually form size differentiation. However, oxygen should be strictly prevented in the cage during the operation to avoid loss.

6 When fry ponds are to be selected in deep water, close to the water surface and slowly put the seedlings. According to the test, fry is poured into the water from a height of 30cm and can damage 5% to 10%; when the height is 60cm above the water level, the fry damage rate can reach 20%. ~ 30%. Therefore, the fish must enter the pool must pay attention to slowly and gently, do not leave immediately after the fry, wait for the fish to spread out into the pool and then leave, such as the discovery of fry densely integrated group, to use the water droplets gently spilled to make Spread out into the pool. When it comes to windy weather, it is necessary to enter the pool in the deep waters of the upper winds, so that the fry will not be injured by the wind when it is blown to the pool slope or to the bottom of the pool.

7 The same pond should be stocked with the same species of fish fry with the same specifications and try to get a foot in order to avoid the occurrence of big fish eating small fish and out of pool specifications. The fish fry with inconsistent specifications are stocked together, and the growth rate of big fry is much faster than that of the fry. Polarization is even more pronounced.

8 The standard of underpile hatched by self-hatching sees two points of the eye and one point of the waist, and can enter the pool when they can swim in parallel. Otherwise, they should be fed in time to avoid the death of fish fry due to hunger. The time of Xiatang is to choose a sunny day without wind and avoid wind, rain, or nighttime pooling.

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