The living habits of leeches

Abstract: leeches live in rice fields, ditches, shallow water pollution potholes and other places, suck the blood of people and animals, move very quickly, can swim in waves, and can also make ruler-like migrations. they are active every spring, and their spawning period is from June to October. In winter, they often lie dormant in the inshore wet mud, do not eat and move, and have a strong ability to survive. Let's take a look at the pictures of leeches and the distribution of their producing areas.

Leeches live in rice fields, ditches, shallow water pollution potholes and other places, suck the blood of people and animals, move very quickly, can swim in waves, and can also make ruler-like migrations. they are active every spring, and their spawning period is from June to October. In winter, they often lie dormant in the inshore wet mud, do not eat and move, and have a strong ability to survive. Let's take a look at the pictures of leeches and the distribution of producing areas.

Distribution of producing areas of leeches

It is produced in lakes, ponds and paddy fields in most parts of China. Mainly produced in Shandong Weishan, Dongping, Nanyang Lake and other lakes, Weishan Lake has the largest output, in addition to supplying the province, and sold in Northeast China, Hebei, Shanxi. Some of the products produced in the suburbs of Suzhou and Wuxian in Jiangsu Province are also exported. In addition, Zhejiang, Anhui, Hunan, Hubei, Sichuan, Shaanxi, Hebei, Liaoning, Jilin, Heilongjiang and other places are also produced and sold by themselves.

The living habits of leeches

Leech is a cold-blooded annelid, which can grow and reproduce in both the south and north of China. It mainly lives in reservoirs, ditches, paddy fields and lakes in fresh water, especially in ponds rich in organic matter or unpolluted rivers. The suitable temperature for growth was 10-40 ℃. When the temperature was lower than 3 ℃, it entered dormant hibernation period in the soil, and the stinging activity was higher than 8 ℃ from March to April of the following year. Leeches are omnivorous animals, taking the blood or body fluids of animals as the main way of life, often using plankton, insects and molluscs in the water as the main bait, and artificial conditions with all kinds of animal viscera, cooked egg yolk, formula feed and plant residues. Freshwater snail shellfish, miscellaneous fish, earthworms and so on.

Population classification of leeches

1. Japanese medical leeches: Japanese medical leeches, also known as medical leeches, are slightly flat and cylindrical, with a length of 3 cm and a width of 4 mm (fixed). The back is green with black, with 5 yellow vertical lines. The ventral face is flat, grayish green, without variegated markings. The body ring number is 103. The banding is not significant, accounting for 15 rings. The male reproductive foramen is between 31 and 32 rings. The female foramen is between 36 and 37 grooves. 5 pairs of eyes, arranged in an arc. There is a front sucker on the ventral front of the body. There are 6 longitudinal pleats of esophagus, 3 jaws, semicircle and well-developed jaw teeth. There is a rear sucker on the ventral side of the back, bowl-shaped, facing the ventral side, and the anus on the dorsal side. Live in paddy fields and swamps. Suck the blood of people and animals. Agile action, can do wave swimming and ruler-like movement. It is active when it is warm in spring, laying eggs from June to October and dormant in winter. The regenerative force is very strong, if it is cut off and raised, it can regenerate a new body from the broken part. It is distributed all over the country.

2. Wide-body golden thread leech: wide-body gold thread vermiculite grows, slightly spindle-shaped, flat, 6 cm 13 cm long and 0.8 cm wide. The back is usually dark green, with a longitudinal line of six fine yellow and black spots, and a deep dorsal midline. The ventral side is yellowish, with many irregular tea-green spots. The body ring number is 107. The banding is obvious, accounting for 15 rings. The male reproductive foramen is between 33 and 34 grooves. The female foramen is between 38 and 39 ring grooves. The eye is the same as that of Japanese medicine. The anterior sucker is small and the jaw teeth are underdeveloped. Live in paddy fields, rivers and lakes. Do not suck blood, feed on plankton, small insects, mollusc larvae and mud humus in the water. It is distributed in most parts of the country.

3. Brown leeches: Brown leeches, also known as cattle and soft-shelled turtles, are slightly smaller than wide-body golden leeches, with a brown-green flat back and a vertical line composed of five fine green and black spots. The ventral surface is yellowish, very flat, with irregular dark green spots. I am similar to the wide-body golden leech. It is distributed in most parts of the country.