The management density of breeding clams should be controlled at 2 to 2.5 kg/m2 or 10,000 to 15,000/m2. The clams should be removed once every 6 to 7 days. The harvested clams should be put into the hatchery bed for moist incubation. At the same time, the pods were overturned and supplemented with side-injection methods to improve the ecological conditions of the breeding beds for breeding.
The thickness of the hatchery bed is preferably 10 to 15 cm. The hatching base should be finely and moist, with 50,000 to 60,000 larvae per square meter. The incubation base is loosened once or twice a month with iron forks. To facilitate ventilation and survival of pups.
When the pre-cubs manage most of the feces of the incubating base, they should remove the excrement in time, feed them with the next method and expand the bed in time to reduce the density of the calf.
The late larvae and adult pupa manage the rapid growth of the young larvae at a later stage. To increase the frequency of removing fecal material, supplement the feed with the next method and expand the bed in time; when the sex is mature and the breeding period is reached, the pupa production and calving advantages must be used. It is time to reduce the farming density or harvest and use in time, or to replace the old species.
Density control The optimum density for aquaculture is 2.8 to 3.1 kilograms per square meter or 20,000 per square meter. Within this range, fewer seeds are cast and the yield is high. The breeding density of early calves can be slightly greater than 30,000 per square meter or 2.5 kilograms per square meter; the rearing calf's breeding density can be gradually reduced to about 20,000 per square meter. Density control should be combined with rotation and updating. The boring bed, hatching bed, pre-pup bed and post-pupling bed should be constructed with an area ratio of 1:1:24. Combined with the expansion of the bed, the density control requirements can be achieved.
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