The market for grouper has been good in the past two years, with high prices and high fry prices. However, as the breeding environment deteriorates year by year, there are more and more problems in the grouper fry breeding process, and it is becoming more and more difficult to deal with. The larger the number, the survival rate is generally lower, resulting in lower breeding efficiency.

So what should I do if grouper fry always die?

1. Causes of grouper fry death

1. Freshwater grouper fry neuronecrosis virus disease (Symptoms: floating, spinning, black body, etc.).

2. High density of fry, insufficient feed, incomplete nutrition, lack of EPA and DHA, leading to death of fry.

3. Water quality and sediment pollution exceed the self-purification capacity of the water body.

4. The biological quality of the bait is poor, and it carries bacteria and viruses, causing the fry to become ill.

5. The environment suddenly changes and the fry are overstressed.

6. Hypoxia.

7. Air bubble disease is highly prevalent.

2. Prevention and control measures for the death of grouper fry

1. Prevent triggering factors and prevent and control viral diseases.

2. Control the density of laying eggs reasonably, 0.1-0.2kg/acre (1-2 male liang) is ideal.

3. Regularly replenish carbon and bacteria to stabilize the water body, purify the water quality, and cooperate with bottom improvement to improve the environment.

4. Wash the insects thoroughly with clean water before feeding them, and mix "You Peptide" and splash them together.

5. Pay more attention to anti-stress when the environment changes suddenly.

6. In the middle and later stages, pay more attention to turning on the aerator to prevent hypoxia.

7. Prevent air bubble disease.

3. Precautions

1. Add enough water at one time and keep the water depth greater than 1.5 meters, which is conducive to the stability of the water body.

2. Stabilize the water body and regularly use "Active Carbon Tribacterial III" to stabilize the water.

3. Use "Li Bai Duo II" to cultivate zooplankton, prevent excessive proliferation of algae, stabilize water and prevent air bubble disease.

4. Turn on the gas head and oxygen machine in advance to help stabilize the water body and reduce or alleviate air bubble disease.

The above are the reasons for the death of grouper fry, prevention measures and precautions. Since viruses, bacteria, etc. have a greater impact on the survival rate of grouper fry, farmers must thoroughly disinfect them before releasing the fry. Make preparations and strengthen management after the seedlings are released.

That’s it for the content about grouper. Welcome to read other agricultural content on Qinggua.com.

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