Choosing healthy shrimp seedlings is the first and most important step in boosting shrimp production and increasing your income. To ensure quality, start by carefully evaluating the source and condition of the broodstock from the hatchery. Ideally, you should import first-generation parents from Hawaii, USA, as they are known for their genetic strength and high productivity. If using second-generation stock from last year, make sure they are robust, have a high egg count, and display active swimming behavior with no signs of illness or weakness.
When purchasing white shrimp seedlings, it's crucial to confirm that they have been desalted properly. The size should be at least 1.2 cm, and they must be tested by an authorized laboratory to ensure they are free from bacteria and viruses. If testing facilities are unavailable, you can disinfect them by adding 50 grams of formalin (formaldehyde) per cubic meter of water. Mix thoroughly and soak the shrimp for a short period. Healthy shrimp will continue to swim normally without showing signs of disease or stress.
Before buying 100 seedlings, place them in a container and observe their behavior. They should swim actively with clear directionality—avoiding circular movements. Their bodies should be smooth, with visible transparency in the abdominal region, normal muscle clarity, intact limbs, and fully open tail fins. Avoid any shrimp with red tails, cloudy middle bowel glands, or black corpus callosum, as these may indicate illness. To test quality further, randomly take a few shrimp and wrap them in a wrung-out wet cloth for 10 minutes. If they remain lively after this, they are likely healthy; if not, they may be weak or diseased.
When moving the seedlings into the nursery, choose a sunny day, either early morning or late afternoon. Carefully open the plastic bag near the edge of the pond and slowly release the shrimp into the water. Allow them to swim down naturally. Even though desalted seedlings have lower salinity, they should be placed in a pond with a salinity of around 5‰ to help them adapt gradually. Ensure the temperature difference between the water in the bag and the pond does not exceed 5°C. If it’s larger, let the bag float in the pond for a few minutes before releasing the shrimp to balance the temperatures and reduce shock.
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