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There are many kinds of scallops, and there are about 30 species in our country. In China's Yellow Sea and Bohai Sea areas, there are local species of borehole scallops and foreign introduced pike scallops and bay scallops. In the South China Sea area, major species of scallops are cultivated. Breeding characteristics The Chinese oyster scallops are warm-water shellfish and naturally distributed in the four countries of Japan, Jiuzhou, South China Sea and Indonesia. In the coastal areas of Guangdong Province, Haimen, Zhalang, Daya Bay, Dapeng Bay, Zhapo and other places are distributed.
It inhabits the rocky reefs, gravel, and gravel with deep waters below the low tide and shallow waters. The temperature range is 8-32°C, and the optimum temperature is 20-25°C. The optimum range for salinity is 23‰-34‰.
The Huagan scallops are dioecious, and they reach sexual maturity within a year or so. Its breeding period is from May to October in the coastal area of ​​Guangdong, and the breeding season is from May to June. Wah Sik scallops can spawn 300-15 million eggs.
Warp Kwong Scallop scallops can grow on the anniversary of the coast of Guangdong and grow fastest from May to November. Generally breeding 1-1.5 years the shell height up to 7.4-8.8 cm, weighing 68-115 grams.
In the sea area, various attachment organisms are often attached to or fixed on the scallop shells, affecting growth, and some of them compete for bait. Starfish and red snails, which can be eaten directly on the seabed, are the enemy of scallops. Seedlings produced by the seedling production of S. scallops are currently mainly relied on artificial seedlings.
1. Occurrence of Swarovski scallops Swarmer scallop eggs are approximately 65 microns in diameter. At a water temperature of 26-29.5°C, the fertilized eggs develop into the D-type larvae after about 22 hours; after about 10 days, they develop and become shell larvae; about 12 days, they reach the eye-point larvae; on the 14th day, they attach. The shell size is 230190 microns.
2. Nursery facilities
(1) Pumping equipment includes power, water pumps, water pipes, etc. The production of suction pipe and water pipe should use rubber pipe or polyethylene pipe, avoid using metal pipe.
(2) The storage tower is used for storing and precipitating seawater. The volume of the storage tower is different. It is usually 0.5 or 1 equivalent to the total amount of water used in the nursery and bait ponds; the location of the storage tower should be higher than the nursery pool and the bait pond, and the structure Mostly round, need to set up rainproof and sun-proof top cover.
(3) The filter tank is generally built in the lower part of the water storage tower, rectangular or square, and can determine the size or quantity of the filter tank according to the filtration rate of one ton flow per square meter per hour and the daily water for nursery.
(4) The nursery ponds are built in special nursery rooms and are semi-buried, single-row or double-row arrangements.
(5) The bait cultivation facilities include an indoor seed preservation culture device and an outdoor expansion culture bait sink. The seed preservation culture device generally utilizes different sized glass culture vessels. The bait pond has a higher topography than the nursery pond in order to realize the self-flowing bait, and the surface of the pond should have a simple and rain-proof roof.
3, nursery method
(1) The maturation of pro-shellfish is used as a pro-ripening pro-scallop to develop good and full-grown selective glands. The stocking density should be controlled within 20-30 cubic meters of water. Every day need to change the water 1 to 2 times, and fed in batches Platycladus or other micro-artificial artificial bait, often need to remove pro-parent feces during the cultivation.
Generally, under the condition of raising the water temperature of 21-28°C, after 7-15 days of breeding, the eligible pro-shellfish can be bred.
(2) Induced production was induced by direct sunlight plus semen, chemical induction by potassium chloride, calcium chloride, and potassium iodide, induction by sperm extract, stimulation by variable temperature and induced by flowing water stimulation, and spawning and sperm delivery were performed. Among them, direct sunlight plus semen has the best induction effect.
(3) When fertilized and inseminated, it is necessary to fully stir the egg to be fertilized evenly, and the water temperature is controlled at about 26°C. Generally, there are 2-3 sperm around each egg.
(4) The larva culture larvae cultivation density of 1-2 per ml of water is appropriate. The bait was launched the next day after the larvae were put into the pool. Bacillus Platanus or Dinoflagellates, Chrysoga, and other microalgae are used for feeding, and the amount of bait is determined according to different stages of larval development. Generally, 300-3000 Platymonas per milliliter of water is maintained, and the number of water bodies per milliliter of water increases to more than 5,000 at the later stage of attachment. The number of feedings is once every morning and afternoon, and the water temperature during the larval rearing period is generally 26-29.5°C.
After larvae have been cultivated for 10-12 days, they must be placed in time for the larvae to attach when eye spots appear. The commonly used seedlingers have different specifications of polyethylene sheets, meshes, etc.
After the metamorphosis, the larvae can still be fed with Platyphus genus, and the feeding amount is 2000-10000 pieces per milliliter of water bodies, which are fed once in the afternoon and in the afternoon. Change the water once a day, change the amount of water for the original breeding water body 1/2 - 2/3.
During the nursery period, it is necessary to grasp the changes in water quality conditions, and the regular monitoring items include water temperature, specific gravity, dissolved oxygen, and PH value.
When Pui seedlings are raised to more than 2 mm, the seedlings can be collected and discharged into the cage and moved to the sea area for culture. The structure of the cage can be determined according to the shape of the attachment base. The size of the mesh is such that the juvenile cannot escape, until the juvenile grows slightly larger, and then uses a larger mesh cage. Develop
1. Selection of scallops in the sea area should be based on sea areas with small waves, smooth tides, abundant bait, and little change in annual salinity, away from estuaries, and free of industrial sewage. Consider setting up offshore facilities and management. Easy to operate.
2. Breeding facilities currently use various types of quail culture.
3, shellfish breeding shellfish breeding refers to the cultivation of shellfish from the sea to shell height of 3 cm. Breeding period is about 4 months, often using cage culture. The shellfish attachment jackets are cultured in various types of tapered cages after being used in long cages or harvested. The bottom of the general cone cage is 33 cm wide. The stocking density of shellfish is 200-1000 per cage. When the shell height of shellfish is as long as 1 cm, 100 to 200 cages per cage are placed; when the shell height is 2 cm, 50 to 100 cages are stocked. During the raising of the seedlings, the management must be diligent in checking, diligent in seedlings, diligent in dividing the cage, changing cages, and injuring. The common enemy pests in the shellfish culture include planarians, crabs, and periwinkles. Washing seedlings, dividing cages, and changing cages should be handled with caution, lightness, and avoid sun exposure or exposure to air for too long. The cultured water layer of Bei Miao should be as deep as possible and should not be exposed.
4, Chengbei culture into shellfish culture refers to the cultivation of shellfish from about 3 cm to 7 cm or more into the shellfish, breeding period is generally about 1.5 years, commonly used cylindrical multi-layer cage.
The breeding density of Chengbei is 25-50 per cage. The daily management during the breeding period is mainly to regulate the aquaculture water layer, clean the cages, remove the shell attachments and change cages. Common types of attached organisms include litchi, sponges, barnacles, oysters, sea squirts, corals, lime worms, and polychaetes. Prevention of enemy damage should be based on diligent inspections, timely detection and timely removal.
Cheng Beiyi should try to breed in a deeper water layer, but it should prevent the cage from sinking to avoid abrasion and enemy invasion. Harvest the artificially-cultivated Thunbergia scallops for 1 year to 1 year and a half. The shells can be harvested when their shell height reaches 7 cm or more. The harvest season should be selected in the month when the "scallop" rate is high and the impact on scallop reproduction is small. Generally, it is harvested in the spring and the harvesting period should be prohibited.
Scallop nursery and breeding
The scallop shell muscles are hypertrophic, delicious and rich in nutrients. Their dried products, commonly known as "scallops," are considered marine products.
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