First, an overview of variegated pupa is a genus of genus, genus, genus, and ocellae, commonly known as oysters, flower pods, sand wolfberry fruit, wolfberry fruit. The meat is delicious and nutritious. Each 100 grams of fresh meat contains 8.1 grams of protein, 0.4 grams of fat, 2.0 grams of carbohydrates, and 0.6 grams of inorganic salts. In addition to fresh food, cooked food, stir-fries, salads, soups, etc., are inexpensive and delicious seafood products. They can also be used as medicines, and have the functions of clearing away heat, warming, phlegm-removing, and dispelling knots. In 2001, the city started artificial breeding, mainly by using empty shrimp breeding ponds or dike aquifuges, mainly for integrated cultivation with white prawn and barracuda. In recent years, large quantities of Japanese live oysters and frozen oyster meat have been exported to Japan at high prices.
Second, the morphological characteristics and biological characteristics (a) of the morphological characteristics of the shell near the oval, slightly protruding shell top, micro-curved front, located in the back of the shell on the front. The small moon face is narrow and lanceolate or not obvious. The ligaments are slender, yellow-brown, protruding from the surface. The surface of the shell is centered on the top of the shell and there is a remarkable concentric growth pattern. Radiating ribs are dense, and the front and rear ends are slightly thick and intertwined with the growth rings. The inside of the shell is light gray or slightly purple. The hinge is slender, and the shell has three main teeth, one main tooth in the center of the left shell, and two furcations in the rear of the right shell. The coat is marked with a deep sinus and a rounded front end.
(II) Inhabiting habits Noise moths inhabit the flat sandy beach near inner bay and estuary where fresh water is injected, and they live in subsistence. Persimmon sediment contains 50-90% sediment, fine and silty sand is appropriate. The suitable water temperature for growth is 15-25°C.
The variegated bedding migration habit gradually migrates to the low tide area or the shallow water area as the individual grows, and different sizes of variegated otters are distributed in different tide areas. Usually the seedlings are distributed at the junction of the high tide area and the middle tide area, and they are distributed in the middle tide area and the low tide area. The migration season of variegated cocoons generally occurs in spring and autumn (April-May and September each year) and is most active in May.
(c) Food habits and growth variability The storks mainly inhabit the mudflats in the intertidal zone along the mouth of the estuary or in Neiwan. They eat diatoms, benthic diatoms, and organic detritus. There is no special regularity in food intake. Generally, the water temperature is below 25°C. When the temperature is above 10°C, the food intake is strong and the food intensity during the breeding season is weakened. Under normal circumstances, after 7-8 months of growth, up to 3-3.5 cm commercial specifications.
(IV) Breeding habits The variegated pheasants are dioecious, in vitro fertilized, and are sexually mature for about 18 months. The breeding season is from mid-September to November each year. A breeding season can be spawned from 3 to 4 batches. The progenitors of gonad maturation are generally exposed to cold air, and the water temperature drops abruptly, emitting sperm and eggs. During the breeding season, pro-sperm fertilizes sperm and eggs in seawater and fertilizes in seawater.
Third, the seed production and cultivation Variety cultured seedlings have two sources of breeding: artificial seedlings and the collection of wild seedlings. At present, artificial breeding of variegated ticks has been successful in Zhejiang and Fujian. Starting from mid-September each year, high-quality pro-shellfish are selected from different cultured sea areas, and artificial induction of oxytocin production is achieved through pro-promoting cultivation of pro-scallops, and a large number of mature eggs are obtained for artificial breeding. This year, the variegated seedlings provided by Qiang Town, Ninghai County, Zhejiang Province have a seed size of 5,000 grains/kg and a price of about 13 yuan per catty. Variegated alfalfa artificial seedlings:
1. Pro-shellfish selection and hatching Pro-shell fish selection of complete shape, full gonadal development, maturity of Jiaozhou Bay 2 Bay shell production. Dissecting microscopy: The shape of the egg is regular, round or oval, with a diameter of 70-80um. Immediately after the water becomes round; sperm is very active. Before hatching, the pro-scallops are cleaned, dry for 10 hours, and packed in rectangular plastic trays, placed in a glass jar, stimulated by running water, and spawned after 9 hours. Eggs are laid in each cell for half an hour, and egg density is 40 to 50. /ml. During the incubation, increase the oxygenation amount and apply EDTA3 to 5xl0-6.
2. Cultivation management (1) Water quality conditions in the culture pool Water temperature 22°C, pH 8.1, dissolved oxygen 7.0mg/L, salinity 32, 22 hours after transfer of D-shaped larvae, hatching rate 85%. At this time, quickly collect the seedlings with a 300-mesh sieve (must use the standard sieve, otherwise, it is easy to miss the larvae) and pour into the prepared pool so as to remove excess sperm and impurities. The density of D-shaped larvae is controlled at 20 to 25 cells/ml.
(2) D-shaped larvae of bait were mainly dinoflagellates and dinoflagellates. The amount of feeding was 25,000-30,000 cells/ml, fed 4 times a day. Shell larvae were fed with forked algae, chaetoceros, and Platymonas subtilis. The single-feeding bait had a density of 30,000-40,000 cells/ml, and mixed feeding was conducted at 40,000-50,000 cells/ml. should. When the water temperature was 24°C and other conditions were constant, the growth and development occurred after 14 days, the body length was 190 to 230 μm, and metamorphosis and campsite life began.
(3) The attachment of the attachment base shall be selected from local fine sand, put into the bottom of the pool after being disinfected with water, and laid with a thickness of 0.5cm. The bait is mainly composed of Chaetoceros, Platymonas and benthic diatoms transplanted indoors, and the amount of feeding increases with the individual's growth. Feeding 6 times a day.
(4) daily routine microscopy every day, check larvae gastrointestinal fullness, according to the specific circumstances of the timely adjustment of feeding amount; check whether the disease occurred, the appropriate use of antibiotics 3 regularly measured body length every day, make records, for comparison, from body length growth The situation judges whether the growth is normal. Pour the pool once a week and change the water twice a day.
3. Outdoor cultivating seedlings Since the beginning of burial and cultivating into commodity seedlings, the outdoor cultivation time is up to 4 to 5 months. Therefore, outdoor cultivation is very important and the following work should be done.
(1) Laying sand layers When the sand content of the bottom soil of the outdoor culture pool reaches 60% to 80%, it is conducive to the buried life of the seedlings.
(2) Keep adequate bait to adopt measures such as replacing filtered seawater, applying compound fertilizer, lowering water level, increasing light, etc., and breeding basic bait to meet the growth of seedlings.
(3) Strictly preventing enemy enemies Apart from rigorous prevention of devastating natural disasters such as typhoons and floods, biological predators such as copepods, canola, silkworms, shrimps and crabs should also receive sufficient attention. Clear the pond thoroughly before releasing the seedlings. After the stocking, prevent the water filter net from being damaged, drain the pool water regularly, and chase to catch predators.
IV. Breeding techniques The breeding of mottled moths is divided into tidal aquiculture and high-pump aquiculture. Our region mainly focuses on aquiculture and aquaculture. The aquaculture technologies in this section mainly introduce aquaculture.
Most of the high-water aquaculture of variegated cockroaches is mainly polyculture. It can be mixed with oriental shrimp, white-tailed prawns, barracuda, squid, and sand-swimming fish. Among them, polyculture with prawns and white-tailed shrimp is best. The following describes the polyculture techniques of variegated clams and prawns and ridge tail whites.
1. The pond preparation requires that no sewage is injected near the shrimp ponds, and the main water source is to use natural tides. The terrain is flat and the slope is small, so it is easy to submerge in water and drain. The bottoms are preferably hard clay or sand mud. Tongkou area of ​​about 100 acres, shrimp pond water depth should be about 150-250 cm, the water level of 100-150 cm, the minimum requirement of 60-70 cm. The inner tidal flat is selected for dicing. Generally 3-5 meters wide, 50-80 centimeters high, frog spacing 60-70 centimeters for sowing and daytime management. About 10 days before transplanting, raise the earthworms and soak them in water for 2-3 days. After the drains, wipe off the water in the pool to prevent the growth of Enteromorpha infestation and facilitate the attachment and growth of seedlings. Generally speaking, the quail and midges in the quail are bred and the quail (low gravy) is a bait station, and the area of ​​the pupa is 20%-25% of the shrimp pond. Before restocking, the shrimp ponds shall be cleaned of silt, residual baits and dried cracked surface of the mudflats, and plowing the cultivated alfalfa surfaces to a depth of 15--20 cm. The drug was disinfected in centimeters, using tea seed cake 20ppm or quicklime 350ppm or bleaching powder 60ppm. After the shrimp ponds are dredged, decontaminated and poisoned, they are filtered by 60-80 mesh sieves and then washed into the washing pool to prevent entry of various pests.
2. Seedling sowing seedlings sowing time generally begins in mid-March, until the end of April, usually after the first shrimp, to prevent shrimp injury. The seedling density depends on the soft and hard ground sediment, the height of the tide zone, and the seed size. The average acre is 30-50 kilograms of seedlings of 800-1200 grains/kg. Seeding method to take water to broadcast, seedlings, seedlings gathered in the barrel first, wash the soil with seawater, remove impurities. Seeding method is divided into two kinds of cast and broadcast. The throwing method is applicable to a wide surface. When sowing seedlings, the left hand-carrying seedlings basket, the right hand lightly pick up the seedlings, hard to cast to the surface. When there is no wind, the two people will sow the seeds on both sides of the plant. When there is wind, they will sow the wind. The sowing method is suitable for narrow pods. When sowing seedlings, the seedling baskets are placed on the mud, and the left and right hands are gently grasped by the seedlings. The palms are pushed upwards to the surface. When planting seedlings, leave 10-20 cm of open space on both sides of the plantation for the seedlings to move in caves so as not to enter the ditch. Water storage for seedlings, water level of 15-20 centimeters, seedlings strive for uniformity; not suitable for the sun, rainstorms Seedlings in the weather should be carried out during the tidal period. Generally, small tides do not propagate seedlings. It is advisable to put prawn 1 million to 15,000 per acre. The ridge-tailed white shrimp seedlings are naturally brought in by seawater and do not need to be stocked. It is also possible to put 10-20 kg of ridge-tailed white shrimp, seedlings and broodstock per mu, and naturally produce shrimp seedlings.
3. Feeding of bait (1) Fertilizing bait After seeding of seedlings or before stocking of shrimps, apply basic fertilizer to bait plankton to produce organic fertilizer, and apply 50-60 kg of manure (chicken manure) per mu. Around the pond, let it gradually release fertilizer effect, so that the water in the pool becomes yellowish green or light brown. After the shrimps are put in, depending on the color of the water, the fertilizer is usually applied once every 15 days to 20 days, and the inorganic fertilizer is mainly applied. The application of urea and superphosphate mixed fertilizer per acre is 1-1.5ppm (ratio 2-3:1). , First dissolve and spray on the surface of the water. As the water temperature rises in July and August, the fertilization in the pond is stopped and fertilization is stopped.
(2) shrimp pond feeding shrimp is suitable for fresh feed or artificial bait, the main plankton in the filter-feeding water, shrimp ponds adhere to regular fixed-point feeding, to prevent insufficient feeding of shrimp to the oysters to find food seedlings, affect the seedlings Growing and survival.
4. Daily management (1) Water quality management After 15 to 20 days after stocking, the shrimps gradually add water, and new water is added in time after the rainstorm. During the middle and later stages of breeding, the amount of water should be increased. After the shrimp is harvested, the water level is reduced to 30-40 cm. In the spring and autumn seasons, keep the water level 20-40 cm above the surface of the quail culture, deepen the water level in July-September hot season, and keep the water depth 50-60 cm. Also deepen the water level before the cold air. Usually, according to comprehensive factors such as weather, water temperature, water color, and the growth and development stage of alfalfa, the fertilizing and feeding materials can be flexibly controlled. The color of the rearing pond is tea-brown, clear green, and the transparency should be 20-25 cm. It should be no less than 15 cm. The water color should not be too strong to prevent the occurrence of red tide.
(2) Tillering Management After the seedlings have been sowed, the survival rate should be checked regularly. If the survival rate is low, the seedling replacement work should be done in time. At the turn of spring and summer, heavy storms frequently occur. Floods entrain large amounts of mud to accumulate scum, and in severe cases can cause suffocation of mottled suffocations. At this time, bulldozers will be used to push the silt away. For lands where the flow rate is slow and where the sludge deposits are faster, after each large tide, a bulldozing and cleaning of the ditch should be carried out.
(3) The elimination of highly predatory breeding ponds and the breeding of moss and predator organisms will not only consume nutrients in the water, but also cover the surface of the culture and affect its growth. Therefore, if it is found, you must choose between the tidal current, the morning or the evening to dry up the beach, usually within 2-3 hours of the dry dew, use 10-15 ppm tea seed cake poison fish (enemy), after 1-2 hours Replace the fresh seawater with high tide as soon as possible, and replace the broken sieve.
(4) Removal of Brassica camphora In early June and late October, the Brassica camphora can be easily propagated in Brassica camphora, affecting the growth of loquat seedlings. In the morning or evening during the tidal wave, dry louse can be selected and cleaned up. (5) Disease prevention and control In addition to the normal work of eliminating predators, shrimp disease should adhere to the principle of disease-free prevention and early disease prevention. In the disease-prone season, one dose of oxytetracycline or furazolidone should be given every 2 months. - 3 days, and once every half month, 0.3-0.5ppm Chlorochlor Hydrate is sprayed once to disinfect the water body.
V. Harvesting, transportation and processing (I) Harvesting of seedlings will be carried out for 7-8 months. After the shrimps are harvested, fertilization will be used for half a month to about January. Before and after spring, the shells will be 3 cm to 3.5 cm long. , you can catch harvest. The harvesting method is to drain water and pick it up with dredging. Generally, 50 kg of shrimp can be produced per mu, including 30 kg/mu of prawn, 20 kg/mu of white-tailed shrimp, and 1,000 kg/mu of mottled pupa. (2) Transport noises are strong enough to adapt to the environment and can survive for hours or even 12 days without death. However, factors such as sorting time and transportation of variegated cockroaches still affect quality. The correct method is to drain the seawater in the shrimp pond, drain it out of the pond, put it in a large nylon net, wash it up and down in another shrimp pond with sea water, and wash away the sediment impurities on the surface of the shell. The clean canvas laid on the dam is immediately sorted and sorted according to four specifications of 3cm-4cm-5cm-6cm; less than 3cm, dead cockroaches, rift clams and crushed clams are separately stored. After sorting, use a woven bag or sack to pack 21 kg of pounds and load them with twine. The means of transportation must be covered, sun-resistant, and rain-proof.
(c) The processing of variegated maggots has several methods: First, the original juice pods vacuum packaging; Second, roasted dry goods; Third, frozen products, can be divided into whole-shell frozen products, raw frozen products, bleaching Hot monomer quick-frozen products, blocks of frozen boiled mutton stew, monomer frozen boiled variegated meat; four is the processing of variegated eucalyptus oil; five is the processing of shell powder and so on.
Second, the morphological characteristics and biological characteristics (a) of the morphological characteristics of the shell near the oval, slightly protruding shell top, micro-curved front, located in the back of the shell on the front. The small moon face is narrow and lanceolate or not obvious. The ligaments are slender, yellow-brown, protruding from the surface. The surface of the shell is centered on the top of the shell and there is a remarkable concentric growth pattern. Radiating ribs are dense, and the front and rear ends are slightly thick and intertwined with the growth rings. The inside of the shell is light gray or slightly purple. The hinge is slender, and the shell has three main teeth, one main tooth in the center of the left shell, and two furcations in the rear of the right shell. The coat is marked with a deep sinus and a rounded front end.
(II) Inhabiting habits Noise moths inhabit the flat sandy beach near inner bay and estuary where fresh water is injected, and they live in subsistence. Persimmon sediment contains 50-90% sediment, fine and silty sand is appropriate. The suitable water temperature for growth is 15-25°C.
The variegated bedding migration habit gradually migrates to the low tide area or the shallow water area as the individual grows, and different sizes of variegated otters are distributed in different tide areas. Usually the seedlings are distributed at the junction of the high tide area and the middle tide area, and they are distributed in the middle tide area and the low tide area. The migration season of variegated cocoons generally occurs in spring and autumn (April-May and September each year) and is most active in May.
(c) Food habits and growth variability The storks mainly inhabit the mudflats in the intertidal zone along the mouth of the estuary or in Neiwan. They eat diatoms, benthic diatoms, and organic detritus. There is no special regularity in food intake. Generally, the water temperature is below 25°C. When the temperature is above 10°C, the food intake is strong and the food intensity during the breeding season is weakened. Under normal circumstances, after 7-8 months of growth, up to 3-3.5 cm commercial specifications.
(IV) Breeding habits The variegated pheasants are dioecious, in vitro fertilized, and are sexually mature for about 18 months. The breeding season is from mid-September to November each year. A breeding season can be spawned from 3 to 4 batches. The progenitors of gonad maturation are generally exposed to cold air, and the water temperature drops abruptly, emitting sperm and eggs. During the breeding season, pro-sperm fertilizes sperm and eggs in seawater and fertilizes in seawater.
Third, the seed production and cultivation Variety cultured seedlings have two sources of breeding: artificial seedlings and the collection of wild seedlings. At present, artificial breeding of variegated ticks has been successful in Zhejiang and Fujian. Starting from mid-September each year, high-quality pro-shellfish are selected from different cultured sea areas, and artificial induction of oxytocin production is achieved through pro-promoting cultivation of pro-scallops, and a large number of mature eggs are obtained for artificial breeding. This year, the variegated seedlings provided by Qiang Town, Ninghai County, Zhejiang Province have a seed size of 5,000 grains/kg and a price of about 13 yuan per catty. Variegated alfalfa artificial seedlings:
1. Pro-shellfish selection and hatching Pro-shell fish selection of complete shape, full gonadal development, maturity of Jiaozhou Bay 2 Bay shell production. Dissecting microscopy: The shape of the egg is regular, round or oval, with a diameter of 70-80um. Immediately after the water becomes round; sperm is very active. Before hatching, the pro-scallops are cleaned, dry for 10 hours, and packed in rectangular plastic trays, placed in a glass jar, stimulated by running water, and spawned after 9 hours. Eggs are laid in each cell for half an hour, and egg density is 40 to 50. /ml. During the incubation, increase the oxygenation amount and apply EDTA3 to 5xl0-6.
2. Cultivation management (1) Water quality conditions in the culture pool Water temperature 22°C, pH 8.1, dissolved oxygen 7.0mg/L, salinity 32, 22 hours after transfer of D-shaped larvae, hatching rate 85%. At this time, quickly collect the seedlings with a 300-mesh sieve (must use the standard sieve, otherwise, it is easy to miss the larvae) and pour into the prepared pool so as to remove excess sperm and impurities. The density of D-shaped larvae is controlled at 20 to 25 cells/ml.
(2) D-shaped larvae of bait were mainly dinoflagellates and dinoflagellates. The amount of feeding was 25,000-30,000 cells/ml, fed 4 times a day. Shell larvae were fed with forked algae, chaetoceros, and Platymonas subtilis. The single-feeding bait had a density of 30,000-40,000 cells/ml, and mixed feeding was conducted at 40,000-50,000 cells/ml. should. When the water temperature was 24°C and other conditions were constant, the growth and development occurred after 14 days, the body length was 190 to 230 μm, and metamorphosis and campsite life began.
(3) The attachment of the attachment base shall be selected from local fine sand, put into the bottom of the pool after being disinfected with water, and laid with a thickness of 0.5cm. The bait is mainly composed of Chaetoceros, Platymonas and benthic diatoms transplanted indoors, and the amount of feeding increases with the individual's growth. Feeding 6 times a day.
(4) daily routine microscopy every day, check larvae gastrointestinal fullness, according to the specific circumstances of the timely adjustment of feeding amount; check whether the disease occurred, the appropriate use of antibiotics 3 regularly measured body length every day, make records, for comparison, from body length growth The situation judges whether the growth is normal. Pour the pool once a week and change the water twice a day.
3. Outdoor cultivating seedlings Since the beginning of burial and cultivating into commodity seedlings, the outdoor cultivation time is up to 4 to 5 months. Therefore, outdoor cultivation is very important and the following work should be done.
(1) Laying sand layers When the sand content of the bottom soil of the outdoor culture pool reaches 60% to 80%, it is conducive to the buried life of the seedlings.
(2) Keep adequate bait to adopt measures such as replacing filtered seawater, applying compound fertilizer, lowering water level, increasing light, etc., and breeding basic bait to meet the growth of seedlings.
(3) Strictly preventing enemy enemies Apart from rigorous prevention of devastating natural disasters such as typhoons and floods, biological predators such as copepods, canola, silkworms, shrimps and crabs should also receive sufficient attention. Clear the pond thoroughly before releasing the seedlings. After the stocking, prevent the water filter net from being damaged, drain the pool water regularly, and chase to catch predators.
IV. Breeding techniques The breeding of mottled moths is divided into tidal aquiculture and high-pump aquiculture. Our region mainly focuses on aquiculture and aquaculture. The aquaculture technologies in this section mainly introduce aquaculture.
Most of the high-water aquaculture of variegated cockroaches is mainly polyculture. It can be mixed with oriental shrimp, white-tailed prawns, barracuda, squid, and sand-swimming fish. Among them, polyculture with prawns and white-tailed shrimp is best. The following describes the polyculture techniques of variegated clams and prawns and ridge tail whites.
1. The pond preparation requires that no sewage is injected near the shrimp ponds, and the main water source is to use natural tides. The terrain is flat and the slope is small, so it is easy to submerge in water and drain. The bottoms are preferably hard clay or sand mud. Tongkou area of ​​about 100 acres, shrimp pond water depth should be about 150-250 cm, the water level of 100-150 cm, the minimum requirement of 60-70 cm. The inner tidal flat is selected for dicing. Generally 3-5 meters wide, 50-80 centimeters high, frog spacing 60-70 centimeters for sowing and daytime management. About 10 days before transplanting, raise the earthworms and soak them in water for 2-3 days. After the drains, wipe off the water in the pool to prevent the growth of Enteromorpha infestation and facilitate the attachment and growth of seedlings. Generally speaking, the quail and midges in the quail are bred and the quail (low gravy) is a bait station, and the area of ​​the pupa is 20%-25% of the shrimp pond. Before restocking, the shrimp ponds shall be cleaned of silt, residual baits and dried cracked surface of the mudflats, and plowing the cultivated alfalfa surfaces to a depth of 15--20 cm. The drug was disinfected in centimeters, using tea seed cake 20ppm or quicklime 350ppm or bleaching powder 60ppm. After the shrimp ponds are dredged, decontaminated and poisoned, they are filtered by 60-80 mesh sieves and then washed into the washing pool to prevent entry of various pests.
2. Seedling sowing seedlings sowing time generally begins in mid-March, until the end of April, usually after the first shrimp, to prevent shrimp injury. The seedling density depends on the soft and hard ground sediment, the height of the tide zone, and the seed size. The average acre is 30-50 kilograms of seedlings of 800-1200 grains/kg. Seeding method to take water to broadcast, seedlings, seedlings gathered in the barrel first, wash the soil with seawater, remove impurities. Seeding method is divided into two kinds of cast and broadcast. The throwing method is applicable to a wide surface. When sowing seedlings, the left hand-carrying seedlings basket, the right hand lightly pick up the seedlings, hard to cast to the surface. When there is no wind, the two people will sow the seeds on both sides of the plant. When there is wind, they will sow the wind. The sowing method is suitable for narrow pods. When sowing seedlings, the seedling baskets are placed on the mud, and the left and right hands are gently grasped by the seedlings. The palms are pushed upwards to the surface. When planting seedlings, leave 10-20 cm of open space on both sides of the plantation for the seedlings to move in caves so as not to enter the ditch. Water storage for seedlings, water level of 15-20 centimeters, seedlings strive for uniformity; not suitable for the sun, rainstorms Seedlings in the weather should be carried out during the tidal period. Generally, small tides do not propagate seedlings. It is advisable to put prawn 1 million to 15,000 per acre. The ridge-tailed white shrimp seedlings are naturally brought in by seawater and do not need to be stocked. It is also possible to put 10-20 kg of ridge-tailed white shrimp, seedlings and broodstock per mu, and naturally produce shrimp seedlings.
3. Feeding of bait (1) Fertilizing bait After seeding of seedlings or before stocking of shrimps, apply basic fertilizer to bait plankton to produce organic fertilizer, and apply 50-60 kg of manure (chicken manure) per mu. Around the pond, let it gradually release fertilizer effect, so that the water in the pool becomes yellowish green or light brown. After the shrimps are put in, depending on the color of the water, the fertilizer is usually applied once every 15 days to 20 days, and the inorganic fertilizer is mainly applied. The application of urea and superphosphate mixed fertilizer per acre is 1-1.5ppm (ratio 2-3:1). , First dissolve and spray on the surface of the water. As the water temperature rises in July and August, the fertilization in the pond is stopped and fertilization is stopped.
(2) shrimp pond feeding shrimp is suitable for fresh feed or artificial bait, the main plankton in the filter-feeding water, shrimp ponds adhere to regular fixed-point feeding, to prevent insufficient feeding of shrimp to the oysters to find food seedlings, affect the seedlings Growing and survival.
4. Daily management (1) Water quality management After 15 to 20 days after stocking, the shrimps gradually add water, and new water is added in time after the rainstorm. During the middle and later stages of breeding, the amount of water should be increased. After the shrimp is harvested, the water level is reduced to 30-40 cm. In the spring and autumn seasons, keep the water level 20-40 cm above the surface of the quail culture, deepen the water level in July-September hot season, and keep the water depth 50-60 cm. Also deepen the water level before the cold air. Usually, according to comprehensive factors such as weather, water temperature, water color, and the growth and development stage of alfalfa, the fertilizing and feeding materials can be flexibly controlled. The color of the rearing pond is tea-brown, clear green, and the transparency should be 20-25 cm. It should be no less than 15 cm. The water color should not be too strong to prevent the occurrence of red tide.
(2) Tillering Management After the seedlings have been sowed, the survival rate should be checked regularly. If the survival rate is low, the seedling replacement work should be done in time. At the turn of spring and summer, heavy storms frequently occur. Floods entrain large amounts of mud to accumulate scum, and in severe cases can cause suffocation of mottled suffocations. At this time, bulldozers will be used to push the silt away. For lands where the flow rate is slow and where the sludge deposits are faster, after each large tide, a bulldozing and cleaning of the ditch should be carried out.
(3) The elimination of highly predatory breeding ponds and the breeding of moss and predator organisms will not only consume nutrients in the water, but also cover the surface of the culture and affect its growth. Therefore, if it is found, you must choose between the tidal current, the morning or the evening to dry up the beach, usually within 2-3 hours of the dry dew, use 10-15 ppm tea seed cake poison fish (enemy), after 1-2 hours Replace the fresh seawater with high tide as soon as possible, and replace the broken sieve.
(4) Removal of Brassica camphora In early June and late October, the Brassica camphora can be easily propagated in Brassica camphora, affecting the growth of loquat seedlings. In the morning or evening during the tidal wave, dry louse can be selected and cleaned up. (5) Disease prevention and control In addition to the normal work of eliminating predators, shrimp disease should adhere to the principle of disease-free prevention and early disease prevention. In the disease-prone season, one dose of oxytetracycline or furazolidone should be given every 2 months. - 3 days, and once every half month, 0.3-0.5ppm Chlorochlor Hydrate is sprayed once to disinfect the water body.
V. Harvesting, transportation and processing (I) Harvesting of seedlings will be carried out for 7-8 months. After the shrimps are harvested, fertilization will be used for half a month to about January. Before and after spring, the shells will be 3 cm to 3.5 cm long. , you can catch harvest. The harvesting method is to drain water and pick it up with dredging. Generally, 50 kg of shrimp can be produced per mu, including 30 kg/mu of prawn, 20 kg/mu of white-tailed shrimp, and 1,000 kg/mu of mottled pupa. (2) Transport noises are strong enough to adapt to the environment and can survive for hours or even 12 days without death. However, factors such as sorting time and transportation of variegated cockroaches still affect quality. The correct method is to drain the seawater in the shrimp pond, drain it out of the pond, put it in a large nylon net, wash it up and down in another shrimp pond with sea water, and wash away the sediment impurities on the surface of the shell. The clean canvas laid on the dam is immediately sorted and sorted according to four specifications of 3cm-4cm-5cm-6cm; less than 3cm, dead cockroaches, rift clams and crushed clams are separately stored. After sorting, use a woven bag or sack to pack 21 kg of pounds and load them with twine. The means of transportation must be covered, sun-resistant, and rain-proof.
(c) The processing of variegated maggots has several methods: First, the original juice pods vacuum packaging; Second, roasted dry goods; Third, frozen products, can be divided into whole-shell frozen products, raw frozen products, bleaching Hot monomer quick-frozen products, blocks of frozen boiled mutton stew, monomer frozen boiled variegated meat; four is the processing of variegated eucalyptus oil; five is the processing of shell powder and so on.
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