Culture techniques of sand worms in ponds

Sand worm scientific name square star worm, the shape is very similar to an intestine, likes burrowing, requests the growth environment does not have any pollution, the nutrition is rich, although is not as expensive as the sea cucumber, shark fin, abalone, but the taste is delicious, crisp and tender is inferior to the sea cucumber and shark fin. At present, the artificial breeding and breeding of sand worms have been realized. Let's take a look at the techniques of sand worm pond culture.

Pond condition

The area of sand worm culture ponds is generally 3 to 5 mu, rectangular or square, with a water depth of 80 to 120 centimeters, with a sediment content of more than 70%, and is required to be loose and thick. The pond embankment is strong and durable, the pond has good water retention and can drain the pond water naturally. The water source is adequate, the water quality is good, and there is no industrial and domestic sewage inflow nearby.

Pond disinfection

1. Pond cleaning: after collecting worms, seal the dry pond, repair the pond dike, clear the bottom of the pond, dig a ring ditch around the pond, the ditch is 50 cm wide, and the pond is divided into blocks, each 200 cm 250 cm wide, leaving a 50 cm wide trench between the blocks for drainage and operation. After turning the soil and raking the soil, the breeding block surface is flattened and polished with a wooden board, which is pressed into a "road shape" from both sides of the block surface to the center, which does not make the block area water.

2. Disinfect fertilizer and water: clean and smear the leveled pond 10 days before stocking, you can choose bleach to make emulsion and sprinkle it in the whole pool, the dosage is 810kg per mu, and the basic bait for water storage and culture after the effective period of fertilizer and water. The water inlet is filtered with a sieve silk mesh bag with an aperture of 80 mesh, and the water intake is 40 cm to 50 cm. Fertilizer and water can choose fermented farm manure, the dosage is 200 kg per mu, spread on the breeding surface, or apply 3 kg of nitrogen fertilizer and 1 kg of phosphate fertilizer per mu.

Culture management

1. Stocking time: the stocking time of sand worms is before and after Ching Ming Festival, 50kg per mu and more than 400kg per kilogram. The seedlings are required to be intact and dark brown in color. The stocking should be carried out on a sunny day, the salinity of the pond is about 25 ‰, and the difference between the salinity of culture water and seedling should not exceed 5 ‰. The stocking density should be 30 strips per square meter, and the seedlings should be spread evenly on the surface of the breeding block and let them naturally drill into the sediment.

2. Pond management: after 2 or 3 days of stocking, the survival rate of sand worm seedlings was checked in the pond. It was found that the survival rate was low and seedlings should be replenished immediately. From now on, we will go down to the pond for inspection every week, and the ditches and dams should be taken care of regularly. In summer, dredge the ditch in time, flatten the block surface into a "road shape", do not make the block area water, make the block surface firm, form a stable living environment, and facilitate the growth of sand worms.

3, water level regulation: during the sand worm cultivation period, pay attention to adjust the water level according to climate change, warm weather in spring and autumn, hot summer and cold winter deepen the water level, generally change water once a week, dry ponds 2-3 days a month, using dry ponds to remove fish, shrimp, crabs and enteromorpha and other enemy pests. During the period of sand worm culture, according to the conditions of the pond, fertilization and reproduction of algae can be carried out appropriately or some artificial bait can be fed as supplementary bait.