Leech farming is suitable for raising in swamps.

Because the water level in the swamp is shallow, aquatic plants are lush, and the bottom layer is organic matter, plankton, etc.

Leech (scientific name: Whitmania pigra Whitman), also known as leech, is a leech species that mainly grows and reproduces in inland freshwater waters.

The body of the leech is slightly flat and looks like a cylinder at first glance. The body is about 2 to 15 cm long and 0.2 to 1.5 cm wide. The back is green with black, and there are 5 yellow longitudinal lines, and the ventral surface is flat. , gray-green, no mottled spots, the overall ring pattern is obvious, the body segments are composed of 5 rings, and the width of each ring is similar. Leeches have high medicinal value and are traditional Chinese special medicinal aquatic animals.

The body length is slightly flat and looks like a cylindrical shape at first glance. The body length is about 2 to 15 cm and the width is about 2 mm to 1.5 cm. The back is green with black, and there are 5 yellow longitudinal lines. The ventral surface is flat, gray-green, without mottled spots, and the overall ring pattern is obvious. The body segments are composed of 5 rings, and the width of each ring is similar.

It has 10 eyes, arranged in a ∩ shape. There are 3 semicircular jaws in the mouth forming a Y shape. When sucking an animal body, it uses these jaws to drill into the skin. The body is large and Body length 60-120mm, width 13-14mm. The back is dark green with 5 vertical lines. It absorbs blood and stores it in the entire digestive tract and caecum from the pharynx through the esophagus. Each segment of the body has an excretory hole, opening on the ventral side.

The male and female reproductive pores are 4 rings apart, with each opening opening between the rings. The front suction cup is easier to see, while the rear suction cup is more obvious and has strong adsorption force.