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Talk about the culture of the clams
Meretrix meretrix is ​​affiliated to the molluscs, and is known as the first fresh in the world. The genus Cinnamomum is dioecious. It reproduces once a year. From June to July in Jiangsu and Zhejiang, it develops and metamorphoses through “D†shaped larvae and platter larvae. It turns into benthic habitat after 9 days. 1. What kind of growth environment does Wenhan require? Wen Hao mostly inhabits the flat shoal where the salinity is low and the amount of sand is more than 50% near the mouth of the estuary, and fine and silty sand is better as the bottom. Clam is a wide-temperature animal, the suitable growth water temperature is 15°C-25°C, and the survival water temperature is -5.5°C～30°C; it is also a wide salt type, and the suitable specific gravity is 1.014-1.025. In the year, Wenlan grows fastest from July to September. 2. What kind of site should be selected for pond culture? (1) The bottom quality requires a muddy sand bottom, which requires a relatively high sand content. Usually, a sand content of 30% or more is preferable. The surface layer is a 5 cm sediment sludge and the center is a 15-20 cm mixed mud sand. Depth requires more than 1.5 meters. (2) Water quality conditions: The specific gravity of seawater is required to be more than 1.014, PH is suitable for partial alkali, the water transparency is 30-60 cm, and the chemical oxygen demand (COD) is less than 10 mg/l. 3. What kind of preparatory work should be done by Wen Hao before stocking? (1) Substrate treatment: The clearing of ponds is done one month before stocking, mainly to remove silt. (2) Drug clearing pool: 15 days before stocking, clear lime ponds were used, 75-100 kg per mu. (3) Cultivate basic bait: It is advisable to use a depth of 20-30 cm in the surface of the influent to incubate the basic bait. The fertilizing water quality is usually applied in the form of base fertilizer and topdressing fertilizer. Basal fertilizer is suitable for organic fertilizer, which can be fermented pig manure, chicken manure, etc., 50 kg per mu is appropriate, organic fertilizer generally takes 7-10 days to be effective; Inorganic fertilizer is suitable for urea and superphosphate, the former 2.5-5 kg/mu, and the latter 0.25-0.5 kg/mu. The inorganic fertilizer has a quicker effect and is suitable for top dressing. 4. How to choose, transport and play the clams? How to master the density? Seed seed specifications required to 400-600 / kg is appropriate. The transportation temperature should be below 15°C. The dry transport method is generally adopted. It is directly packaged in turf or sacks, but care must not be taken to squeeze it too far. Before stocking, the seedlings should be allowed to dry and the seedlings should be played as soon as possible after they are shipped, and play should be uniform. Within one hour after the seed is broadcast, the clams have usually sneaked into the mud sand and can then enter the water. Generally 1 meter is appropriate. The amount of seedlings should be 80-150 pieces/meter 2 on the beach surface, and the pond area should be 20,000 pieces of ponds for each pond, as calculated by the total area of ​​1/3 ponds in the pond. 5. What are the links that should be paid attention to by the management of the writer? (1) Adjusting the water depth and changing the water: In the high temperature season, the daily water exchange volume is larger, and the normal water change depends on the water color. When the water color is abnormal, it must be completely replaced. (2) Fertilization: Fertilization depends on the color of the water and the weather, and fertilization is usually selected when the weather is fine. (3) Daily observation: Regularly monitor the growth of the clams and find that they are abnormally treated in time. Since clams have migration habits, they found that the clumping phenomenon should be evacuated in time. (4) Removal of filamentous green algae: After the growth of filamentous green algae, covering the beach affects the growth of clams. (5) Destroying enemy enemies: The enemies of the clams are jade snails, crabs, ferocious fish, etc. and must be strictly removed. (6) Disease prevention and treatment: A large number of deaths often occur in the high temperature season. The mandarin ducks emit fine eggs and the plumpness falls sharply; or due to continuous rainy weather, there is too much fresh water; the water quality is too thin, the water quality is polluted, and the sediment contains too much mud. Other factors can also cause Wen Hao's mass deaths. The key to prevention and control is to create suitable environmental conditions, control reasonable stocking densities, and implement scientific management methods so as to make use of Wenchuang to live in, eat and move, and ensure that the clam can grow quickly and healthily. 6. When is it appropriate for the clam? From the point of view of the ratio of body length to meat weight, weight gain is fastest at the age of 3-4 years, and the rate of increase of meat afterwards is reduced. Therefore, the length of the clam shell is generally more than 4 cm. 7, how to do with the body of sand? There are often fine sands in the jacket and digestive tract of the clams. After harvesting, the clams must be spit-dried. The clams that are about to be caught are kept in containers or ponds filled with clean seawater. The sand can be spit-out after a few nights.