Fish fry pond technical points
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Second, check the residual drug in the pond. If the toxicity of the drug has not completely disappeared, it may lead to poisoning and death of fish in the pond. The inspection method is: take half a barrel of bottom water, test the fish in the bottom water, or place the fry in a small cage in the pond, observe for 8 to 12 hours to determine whether the fry can enter the pool; The pH of the pool of water that can be measured, such as a pH of 8.5 or less, indicates that the toxicity has disappeared and the fish can be released; observation of pool water, if any, may indicate that the toxicity has disappeared.
Third, check the pool of fat. It is mainly based on the color of water, transparency and the number of food organisms. When the fish fry under the pond, the pool water is grayish-white, yellow-green or light yellow, and the transparency is 30 cm to 35 cm. Each liter of water contains about 10,000 rotifers, and the biomass is 20 mg to 30 mg per liter. If the pool water is not fat enough, the fish will grow poorly due to lack of feed. So the compost should be composted or poured into the pool corner of Xiangyang to fertilize the water immediately. When it is found that the water quality is too fat, it should be diluted with water and then put the fish. For example, if the base fertilizer of the pond is too early and the peak of rotifers has passed, excessive zooplankton such as blisters will be generated in the pool water, which will inhibit the reproduction of small zooplankton of the fry, and interfere with the activity and feeding of the fry. 0.3-0.5ppm crystal trichlorfon can be used. The pool is spattered to kill, and fish fry can be released after 1 to 2 days, or 300 to 400 tail fish species of more than 13 cm per acre are allowed to eat large zooplankton. At the same time, it can be judged whether or not the pond water is fat enough to be floated before the dawn, but the fish should be caught before the fry is released.
Fourth, timely pond. Fry hatching from 4 days to 5 days shows two eye spots and one waist point. When swimming normally in the water, it should be passed through the pond in time. When entering the pool too early, the fry is too tender and it is easy to sink into the sediment to cause death. If it is too late, it will affect the growth of the fry and the survival rate is low.
Fifth, stocking specifications should be consistent. The fry stocked in the same pond should be of the same variety and the same specifications, and should be enough to prevent the big fish from suppressing or eating small fishes and the appearance of irregularities.
Six, adjust the water temperature. When fish fry ponds, the temperature difference between the pool water and the fry container must not exceed 3°C. If the temperature difference is too large, it is necessary to gradually adjust the fry before adapting to the pond. For fish fry transported in plastic bags, the plastic bag should be opened first and slowly placed in a cage pre-placed in the fish pond until 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. Minutes later, the fry and water are slowly poured into the cage, so as to adjust the temperature difference and the adaptability of the fry to the air pressure inside the bag, that is, “slow seedlingsâ€. If the fry is directly poured into the pool from the bag, the mortality of the fry is very high.
Seventh, the fry should be eaten before the next pond. The fry can be fed with egg yolks before the lower pond and one hen per 100,000 fry. The method is to fully cook the eggs or duck eggs, remove the egg yolk, use double gauze wrapped in the water, knead the egg yolk and splash it on the fry, and feed the yeast or rotifer. Insist on fry eating satiety pond, the survival rate can be significantly improved.
8. Choose the appropriate time, place and method of restocking. Fry stocking should try to choose sunny noon or afternoon, when the water temperature is high, dissolved oxygen is sufficient, is conducive to quickly return to normal activities after the fish pond, should avoid windy windy weather or night into the pool. In the windy days, the seedlings should be placed on the top of the deep water to avoid the large number of deaths caused by the stormy fish fry blowing to the pool or pressing to the bottom of the pool. When raising the seedlings, slowly tilt the container of fish fry into the water and let the fry slowly swim out of the water or pull the seedling container back slowly. Do not pour the fry into the pool. In addition, do not leave the fish fry immediately after entering the pool, and wait until the fry spread into the pool and then leave. If the fish seedlings are found to be densely integrated, they should be splashed with water droplets to spread them into the pool.
Nine, the depth of the pool is appropriate. Requires the pool water to be 40 cm to 50 cm deep, so that the temperature of the sun is easy to increase, the light is sufficient, the water quality is easy to fertilize, and the food organisms reproduce quickly, which is conducive to the rapid growth of fry.
Ten, stocking density appropriate. The fry were bred into Wuzi pools, and generally 200,000 to 250,000 tails of carp fry or grass carp, herring and carp seedlings were planted from 150,000 to 200,000. Such as fry bred into summer pool, then put 100,000 to 150,000 tail per mu, or grass carp, herring 80,000 to 100,000 tail.