How to care for and protect farmed fish during the rainy season

(Baonghean.vn) - To ensure that fish are raised successfully until harvest, farmers need to take good care of and protect the fish during the rainy season.

Disease management

The erratic changes in temperature, humidity and rainfall during the rainy season are one of the causes of the growth and spread of pathogenic microorganisms, causing environmental shock.

Common diseases in fish are caused by parasites, bacterial infections, etc. Symptoms include red fins, red beak, swollen head, loss of appetite, swollen abdomen, and bleeding in organs.

To kill bacteria, pathogens, and ensure the pond environment, it is necessary to regularly use stone powder, lime powder, and lime water; the dosage depends on the species being farmed.

Limit changing pond water during the early season flood season and late season flood season because at this time the water source is often polluted from domestic water and water with many pesticide residues in the fields.

It is necessary to increase the resistance of fish by adding vitamin C mixed into daily food; different dosages to suit each type of pet.

Supplement fermented food with a smell that stimulates the ability to eat more, helps improve digestion, and protects the fish's intestines.

How to care and protect

- For ponds, lagoons, lakes:Check and repair the pond bank to ensure it can retain water. It is necessary to clear branches and trees around the bank to avoid branches and leaves falling into the pond and polluting the pond.

At the overflow culvert, place a V-shaped screen to increase the drainage area to prevent fish from escaping when a major flood occurs.

Drain some water from the pond, prepare barriers and bamboo poles to reinforce and repair the bank and culvert systems, and have nets to prevent overflows that can cause loss of farmed aquatic products during heavy rains and strong winds. Spread lime around the pond banks to prevent alum from flowing down and changing the pH of the pond.

After storms, check the water quality in the pond to take appropriate adjustments such as liming (1 - 3 kg/100m2); adjust water color or change water when necessary.

- For rice fish farming model:Reinforce the field banks firmly and build the banks 0.5 m higher than the water level to overcome floods. Many drainage culverts must be arranged around the fields.

Nets must be stretched around the edge of the field and checked regularly to fix any torn nets or water flowing under the net, causing loss.

Regularly check the sewer system, banks, and vulnerable areas to prevent bank breaks. Clean sewers and ditches to allow water to drain quickly.

Prepare drainage pumps when necessary; flood prevention plans need to be calculated for the entire farming area.

- For cage farming on rivers and lakes:Check the cage again, reinforce the anchor system, cage buoy and move to a sheltered place with a gentle current to avoid rain and wind damaging the cage.

In case the cage cannot be moved, lower the depth of the cage to reduce waves and wind.

Regularly clean the cage, keep it well-ventilated to drain water; hang lime bags in front of the water flow to prevent fish diseases.

Closely monitor weather developments and flood levels to proactively respond and protect effectively.

Environmental sanitation

During heavy rains and floods, dead animals, plants, grass, and garbage containing many substances harmful to shrimp and fish will flow into the pond with rainwater, causing pollution that can kill fish en masse; grass and garbage are also a shelter for pests, so it is necessary to clean up grass and garbage on the pond banks before the rainy season comes.

In places where the soil is contaminated with alum, newly dug ponds or newly renovated ponds, the latent alum at the pond bank will flow into the pond with rainwater, causing the pH to suddenly decrease, causing shock and mass fish deaths. Therefore, it is necessary to use lime powder and spread it all over the pond bank before it rains at a rate of 10 - 15 kg/100 m2 of bank.

When taking water into the pond at this stage, it is necessary to pay attention to water quality, because flood water from upstream flows through fields and residential areas, carrying many pathogens that can cause disease outbreaks; when the flood recedes and agricultural production activities resume, agricultural chemicals are toxic to farmed fish, changing the ecological and environmental conditions of flooded areas and changing water quality.

Ngoc Anh

(Synthetic)