How to purchase healthy shrimp stocks is the first stage of striving for increased shrimp production and income increase.
1. Learn to observe the source and posture of the broodstock from the hatchery where you purchased the shrimp. It is best to import the first-generation parent from Hawaii, USA; if you use the second-generation parent cultured last year, you must be physically strong and have lots of eggs. , swimming and lively, no old and sick.
2? Buy white shrimp seedlings, hatching units must first be desalted, specifications should be 1.2 cm or more, and tested by the test center to prove that no bacteria, viruses. If there is no testing equipment, put 50 grams of formalin (ie formaldehyde) per cubic meter of water. Mix thoroughly and mix. Soak some shrimp to disinfect. According to their ability to endure, normal swimming is normal and there is no sick virus. Healthy shrimp.
3? buy 100 white shrimp seedlings, first into the basin to observe, its swimming and lively, there is obvious directionality (not playing circle), body surface smooth, body drive transparency, muscle turbidity, limb integrity, tail fins open The big whip is not red, the middle bowel glands are turbid, and the corpus callosum is not black, indicating that the whole body is free of symptoms. Randomly remove dozens of tails and wrap in wrung wet hair for 10 minutes. On the contrary, it is a poor quality seedling or a diseased seedling.
4. The nursery shall be carried out on a sunny day in the morning or in the evening. Open the plastic bag at the edge of the pond and slowly put it into the pond so that the shrimp can swim down the wind to the whole pool. The desalted shrimp seedlings, although with reduced salinity, should still be placed in a pool with a salt concentration of about 5‰ to allow them to gradually adapt to the water quality environment; the difference between the pool water temperature and the temperature inside the seedling bag must not exceed 5°C. If the water temperature difference is too great, the plastic bag should be put into the pond for a few minutes before stocking, in order to reduce the temperature difference between inside and outside.
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