Using chemicals to kill snails in shrimp ponds

In shrimp ponds, the snail that often appears is the nail snail. To limit and destroy this type of snail, it is necessary to pay attention to some points.

Harmful effects of snails

Snails in the pond can be vectors for many diseases transmitted to shrimp; snails can compete with shrimp for food and habitat. In particular, if there are many snails, it will lead to a decrease in alkalinity in the pond because snails absorb calcium in the water, which can cause the shrimp to lack calcium, have soft shells, and have difficulty molting.

Lime and dry the pond to kill snails and snail eggs - Photo: Tran Ut

How to prevent and treat snails

- Renovate the pond well, add lime and dry the pond, make sure to kill all snails and snail eggs.

- Take water when the water is high, use a water filter carefully before supplying it to the pond. The bag is made of cotton fabric, sewn in 2 layers, 8 - 10 m long, 0.6 m in diameter.

- The water is left in the settling pond for 5 - 7 days for the eggs and larvae to hatch, then the water is treated with 10 - 15 (kg) liters of Chlorine/1,000 m3 or 20 - 30 liters of Formalin/1,000 m3. Then wait 24 - 48 hours before pumping it into the rearing pond. Before pumping, shrimp must be caught and tested to ensure that these substances have decomposed or evaporated completely.

- During the farming process, if there are snails, you must find a way to scoop them up periodically (be careful not to make the water cloudy). Catch snails manually as follows: You need to see what the snails' eating habits are, what time of day they are most active, and whether they usually gather at the bottom or edge of the pond; then try spreading bait for them on the edge of the pond and then use a net or your hand to catch them.

Use a net to catch snails by putting food scraps (smaller than shrimp food) in the net, wait for the snails to eat, scoop them up and catch them gradually or use bamboo panels placed around the pond. Snails love to stick to this substrate, but at first, you must observe whether it affects the shrimp or not.

Check and catch snails daily, this method is relatively effective in shrimp farming ponds.

According to (Vietnam Fisheries) - LC