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The earthen pond nursery can be used in abandoned shrimp culture ponds or abandoned salt fields, and can be used after being modified. It can also be constructed in embankment surrounding earthen ponds in high tide areas. There are two ways to raise seedlings in earthen ponds: First, sexually mature snails are used as broodstock to be raised directly in ponds to allow them to mate and spawn in ponds and to culture planktonic larvae in ponds. Another method is to collect egg populations in the mud-fish culture area and hatch and grow seedlings in the soil pool.
First, choose a smooth surface coating, slow water flow, rich food, and the physical and chemical conditions in line with the soft coating of the larvae of larvae. Dike, increase 50cm, can store 20cm after low tide. High tide area, each earthen pond area 2-3 acres. A simple bamboo frame plastic film shed can be constructed above the pool to prevent the scorching sun and heavy rain.
In the 15 days before the injection of the snail brood or egg group, the coated surface is deep-frozen once, and the mud is crushed. The complex shellfish and shrimps, crabs, fish and other predator organisms are removed, and the drug can be used to clean the pond and remove the stagnant water after the clear pond. , Disinfection in the sun exposure, and then flatten the beach, cultivating benthic diatoms.
Storing snails in the pond must pay attention to the survival and activity of the broodstock and find that the death should be promptly removed. Otherwise, the water quality will be easily damaged. About one month after hatching, the painted surface is patchy, indicating that there is a life of small snails. It is advisable to store more water, prevent sun exposure and heavy rain, and do not flip the surface. Seedlings usually dry once a month, and individuals can dry up once in half a month.
Generally, the base fertilizer is applied during seedling raising. Fertilizer is not applied during the seedling raising process. Nitrogen fertilizer, phosphate fertilizer or fermented chicken manure can be applied each time. Fertilization should be applied in small quantities for several times. Water should not be released after 2-3 days of fertilization. At this time, the snails will infiltrate into the mud. . Early spring breeding should pay attention to the cold wave and cold air invasion, and prevent the diseases in the later period of breeding.
How to produce slaughtered fish?
The adequate supply of seedlings directly affects the development of aquaculture. At present, the seedlings for breeding mainly rely on wild seedlings, and the earthen seedlings only provide a small amount of seedlings. The wild seedlings in the natural sea area are greatly influenced by the sea conditions, and it is difficult to ensure the quantity and quality of the wild seedlings, which will bring difficulties to the seed production. The wild seedlings were collected at the dense density of the juniper seedlings, and the seedlings were scraped gently and washed with seawater to remove impurities.