Reasonably arrange broodstock aphrodisiac According to the reasonable schedule of flight apology and the number of broodstock. In the early stage of reproduction, the aphrodisiac is usually 9 days ahead of schedule, 8 days in the middle period and 7 days in the latter period. In order to prevent accidental factors such as premature or delayed embryonic development and aircraft flight delays due to abrupt changes in the weather, it is necessary to destroy a batch of broodstock before and after each other, just in case. In addition, there must be room for destroying the number of broodstock, and it is generally advisable to have more than 40% of the broodstock in the pre-breeding period than the plan, with more than 30% in the middle period and more than 20% in the latter period. Pay attention to holding The fish fry can be moved to the outdoor holding box for raising after 6 hours. During the temporary raising period, it is usually held in the state of hydrostatic oxygenation for 8 hours, and 2 million fry can be raised per cubic meter of water. The purpose is to promote the natural death of the abnormal seedlings and the poorly physique and less active fry in the still water state. At the same time, the metabolic waste can be excreted in fish fry, which will help improve the survival rate of airborne fry. Scientific bagging transport After being raised, it can be bagged, and it must be noted that: 1. Correct points, rather than lacking. 2. Packing water must be filtered through a 100 mesh screen in order to filter out all plankton in the water as much as possible to prevent it from rot and oxygen in the bag. 3. Air oxygenation of fry should not be excessive to prevent exposure of the bag. The fry can be packed in double bags. Generally, 5-10 million fry can be loaded per bag. package. 4. Be sure to take into account the time spent loading seedlings, transport time, and waiting time when installing seedlings. It is necessary to leave a margin, but it should not be premature. The seedlings should be treated differently When the seedlings arrive at the airport of the other party, they must immediately sample and unpack and inspect the fish fry. If any abnormalities are found in the fry, they must open the bag and change the water and oxygen immediately. At the same time, according to the total amount of time spent on starting the transportation, the difference should be treated as if the transportation time is within 20 hours, and it can be transported directly from the airport to the pond for stocking. If the transportation time is more than 20 hours, the airport should be reopened for water refilling and oxygenation before transportation. When stocking, be sure to pay attention to adjusting the water temperature difference and air pressure inside and outside the bag. In case of abrupt changes in the weather, a holding box should be set up in the pond (better indoors).
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