Net cage culture technique of leech

Leech is a traditional special medicinal aquatic animal in China, which is mainly fished naturally in history, and now it has been farmed artificially, and its breeding does not require strong labor. As long as there are sufficient water sources and can buy feed (snails, mussels) absorbed by leeches in the middle and lower reaches of the Yellow River and the Yangtze River, they can be farmed. Let's take a look at leech cage culture technology.

Water quality condition

1. Leeches have a wide range of adaptability to water acidity and alkalinity, with pH between 6 and 8 and transparency between 20 and 30 cm.

2. Leeches will die in alkaline water, but acidic soil and water quality have little effect on the growth of leeches.

3. The leech culture pond should prevent chemical pollution, and agricultural chemical fertilizers, pesticides and all kinds of washing water should not flow to the culture pond.

Cage setting

1. Cage selection: the cage is made of polyethylene jointless mesh cloth, the specification is 2 × 4 × 1 meter rectangle, the upper opening surface extends 0.15 meters anti-escape eaves around, the cage is fixed with wooden piles, and the upper end is tightened with soft wire rope.

2. Cage setting: the cages are arranged in many rows in the pond, each row is 2 meters apart, there is no space between the cages in the row, more than 1.5 meters from the ridge of the pond, 0.2 meters into the water, 0.8 meters from the exposed water, and the bottom of the cage is about 0.2 meters from the bottom.

3. Young leeches into the box: after the cage is set up, the 20 jin leech egg cocoons hatched in the foam box soil are about to be broken after cleaning. Each cage keeps about 400 one jin egg cocoons, and then put in 2 foam box lids.

Feeding and management

1, bait feeding: the artificial breeding of leeches is mainly to put snails, and 25 kilograms of snails can be put at one time per mu, so that the leeches can reproduce naturally and feed freely. When the bait is insufficient, some earthworms and insects can be fed, and animal blood can be fed once a week.

2. Water quality regulation: although the water body of leech pond culture is large and not easy to corrupt, we should also pay attention to the water quality. The yellowish brown and light green water body is better, the water depth is 60 cm, the water transparency is 10-20 cm, and the pH value is neutral or slightly acidic.

3. Prevention of bdellosis: once every semimonthly after the leech is put into the box, the water body inside and outside the box is diluted with 125ml per mu of polyvitamin copper per mu of water depth, and 0.5 grams of norfloxacin per 0.5kg snail is soaked for six hours before feeding.

4. Separate boxes of leeches: when leeches reach 2000 leeches per kilogram of leeches, the young leeches of 20 cages are put into the cages of 100 young leeches according to the standard of one kilogram and a half of leeches, and all of them are covered with bird-proof nets.

5. Daily management: leech cage culture should patrol the pond once a day, adhere to the principle of "prevention without disease and early treatment of disease", at the same time check whether the cage is damaged and leech eating, observe the life and growth of leech, and make good production records.

6. Fishing and harvesting: leeches can be harvested twice a year, and leeches that have been bred for two seasons are fished out for processing and sale in mid-and late June. Those released in early spring in mid-and late-October are generally grown up, so you can consider fishing some of them, but most of them should be caught in the second year.