Building ponds with cofferdams

According to the requirements of the healthy sea cucumber breeding project, it is necessary to build ponds with stone cofferdams and build a standard pond of 80 acres in the form of stone reefs. *** 18,000 m3 of stone was invested to build a sea cucumber healthy breeding test pond with an east-west orientation, semi-tidal type, and convenient water supply and drainage. In order to facilitate the cleaning of the pond, the reefs in the pond are formed into ridges, and rocks are thrown along the "Leek"-shaped frame. The reefs are 2.5m wide and 1.2m high, and the total length of the reef ridges is 3580m. The west weir of the pond is adjacent to the sea, and is equipped with two inlet and drainage gates, a high one and a low one. The low gate is used for clearing the pond, and its base surface is the same as the lowest tide level. The base of the high gate is facing the semi-tidal surface, and the tidal difference can be used to naturally absorb the tide into the pool. Both the high and low gates can be controlled manually. In addition, one set of inlet and drainage pump units are specially installed next to the adjacent sea weir for emergency use. After the pond is built, a low gate is used to release the pond water at low tide, and the remaining water is pumped dry to remove harmful organisms such as gobies, Japanese crickets, and starfish. Level the bottom of the pond and sprinkle 70kg of lime powder per mu for disinfection. One week later, apply 1,000kg of fermented chicken manure per mu, add 50cm of water, and fertilize the water for 60 days. After the water quality stabilizes and benthic diatoms multiply in the pond, sea cucumber seedlings will be released.

Source and release of seedlings

Seeds of sea cucumbers come from natural harvesting and artificial cultivation. Naturally harvested seedlings vary in size, generally ranging from 3 to 10cm in length. Before the seedlings are released, they are temporarily raised for 3 to 5 days, graded and screened, and disabled ginseng seedlings are picked out and quickly put into the breeding pond. Artificially cultivated seedlings are all intermediately cultivated, and the sea cucumbers are put into the pond when the sea cucumber body is more than 5cm long.

Feeding and management

After the sea cucumber seedlings are released, they enter the feeding and management stage. Their main tasks are to provide feed and control daily water quality.

Bait feeding Feed the breeding pond regularly and evenly every 2 days, including 50% starch, 20% sea mud, 8% fish meal and 22% seaweed powder. About 10% of the total amount of parameters. In order to maintain stable water quality and abundant food, rafts were set up along the ridge artificial reef in the pond to cultivate kelp and wakame. At the same time, algae plants such as macrophylla and rattleweed were transplanted into the pond to create a good habitat for the healthy cultivation of sea cucumbers. place.

Disease prevention measures: In order to prevent the occurrence of diseases, use disinfectant once every half month and splash it in the whole pool at low tide, which can have a good disease prevention effect.

Water quality control In order to prevent floating garbage and floating oil pollution from entering the pond with the tide and contaminating the water, three floating raft-type pollution and oil prevention nets were set up in the water inlet channel to intercept floating garbage and oil pollution. Technicians insist on observing the water quality in the pool every day, and conduct water quality tests regularly every 7 days during high temperature periods. Whenever there is heavy rain at low tide, start the water pump in time to transfer water to the pond to prevent the salinity of the pond from decreasing and seawater desalination.

Temperature control and oxygenation The high temperature season in Longkou is from mid-July to early September every year. The breeders use 8-horsepower fishing boats to regularly sail and surf in the pond from 11:00 am to 3:00 pm every day to increase oxygenation, cool down, and prevent sea cucumbers from suffocating due to lack of oxygen.