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The grasshopper, also known as the leech, is widely used in traditional Chinese medicine for treating a variety of conditions such as stroke, rheumatism, pain, excessive salivation, hepatosplenomegaly, amenorrhea, paraplegia, and angina pectoris. When raising grasshoppers, it's important to create suitable aquaculture ponds that are shaded from direct sunlight and have good drainage. The pond should be small in size with water inlets and outlets located at opposite corners. Adding stones and branches at the bottom of the pool provides a natural habitat for the grasshoppers.
Grasshopper seedlings can either be cultivated or purchased, and it's recommended to source them from diverse locations to ensure genetic diversity. These creatures are hermaphrodites, meaning each individual can lay eggs. The best time for breeding and catching is during the summer and autumn seasons. For optimal results, select healthy seedlings weighing between 20 to 40 grams per unit. These individuals tend to reproduce more and have higher hatching rates. They can be raised and processed for sale starting in early June, with a stocking density of about 10 to 15 kilograms of seedlings per acre.
Grasshoppers are highly resilient and require careful management in terms of feeding and water quality control. Their diet mainly consists of snails, fish, frogs, and livestock, which they feed on by sucking blood. In artificial settings, their food sources include animal blood, rice bran, and other similar materials. Each acre of water should be stocked with approximately 25 kilograms of snails to allow natural reproduction, while providing animal blood once a week to support the grasshoppers' growth.
Leeches are sensitive to environmental conditions and water quality. While they can survive in slightly polluted water, maintaining clean water is crucial, especially in high-density farming systems. Adequate dissolved oxygen levels must be maintained, and regular water changes are necessary during hot months like July and August.
After winter, grasshoppers stop feeding and burrow into the soil to hibernate. Those raised in early spring typically grow to maturity by winter. At this time, the water is drained, and the grasshoppers are caught using nets. Healthy, well-grown individuals (around 15 kg per acre) are selected and moved to breeding pools for wintering, while others are harvested and processed.
From April to October, the outer layer of the grasshopper’s ovary becomes spongy, and they lay eggs in semi-moist, loose soil found in fields. Therefore, when using paddy fields for grasshopper farming, the depth should not be too great. It's important to manage drainage during rainy periods and avoid waterlogging, as this can lead to egg death. A single pod can hatch between 10 to 20 grasshoppers.
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