I. Introduction
1. Biological characteristics 1 Morphological characteristics and distribution. Black crickets are elongated and flat. Body length is generally 20-30cm, weight 100-300g. The kiss is more pointed, the mandible is longer than the maxilla, and the two jaws, the vomer and the cheekbone are finely toothed. There is a black line on the outside of the maxilla, the back of the head is low, and the back is pointed. Big eyes high. The interval between the eyes is approximately equal to the eye's eye, and there is a pure spine at the lower edge of the orbital bone. There are nicks in the middle of the dorsal fin, with 13 fin spines and 12 soft bars. Caudal fins rounded. Wearing a fine round scales. Gray and brown on the back and sides, with irregular black markings. Chest and belly gray. The dorsal fins are dark yellow and the rest of the fins are grayish black.
Black cloth in the western North Pacific. In the Yellow Sea and Bohai Sea in China and the East China Sea, the northern coast has been seen all year round. North Korea, Japan and southern Okhotsk are also distributed.
Black storks belong to the bottom-water fish of the warm waters. They like to inhabit shallow sea rocks or seaweed groves. They don't like light. Before the age of 2 inhabitants, they inhabited the rocky sea area with a water depth of less than 20m. Older fishes move along with their growth to the deep sea, and they swim back to the shore near the water depth of 20-30m near the farrowing period. This type does not travel long distances. However, in spring and autumn, with the change of water temperature, water groups can be formed and short distances can be traveled.
2 living habits. Black cockroaches are more resistant to low temperatures. Their optimum temperature range is 8-25°C, and they grow faster at 14-22°C. When the water temperature 5-6 °C then stop feeding. The lethal temperature is 1 °C.
Black cockroaches are carnivorous fish, miscellaneous fish, miscellaneous shrimp, shellfish, cephalopods, etc. can eat. The black sea bream in the Yellow Sea and Bohai Sea mainly eats small fish such as squid, yellow peony, fangshiyun, yujin fish, sardine, spot-fish, etc., as well as ridge-tailed brown shrimp, eagle claw shrimp, and cephalopods. Black crickets are very bulimia, stomach abundance is very high, the food intake is quite large, the daily food intake of younger fish can reach 7.5% of body weight, and the amount of satiety is about 11%.
3 grow. Black locust grows faster. According to the cage culture experiment in Changdao County, Shandong Province, the species of 7-18cm in length and 40-150g in body weight were placed on July 30 and measured on November 15th. The average body length was 25.5. Cm, the average weight is 485g. Continue wintering in the local sea area and continue growing in the following year. Before the 5th instar, the black storks grew fast, declined after the 5th instar, and decreased significantly after the 8th instar. From the perspective of cage culture in Yantai City, the 1~2cm seedlings culture can reach 250g in the second year and 600-800g in the third year, while the breeding sea catcher can reach 400g in the second year and 900-1000g in the third year. .
4 breeding habits. Black quail eggs raw fish. The male fish were 2-3 years old, and the female fish were sexually mature at 3 to 4 years of age. The breeding population consisted of 3 to 14 years of age. Among them, 3-4 male fish and 5-7 female fish were dominant. Male and female broodstock were copulated before and after November, after which the eggs developed into larvae in fertilized female fish, and they were produced again. The early litter water temperature is about 11°C, and the water temperature during the prosperous period is 13-16°C. The calving period of Shandong coastal indica is in April-May, and the peak period is in mid-May.
The litters usually have a smooth flow of water and fresh water in the reef sea area near the shore and inner bay. Larvae swim freely from the mother's output. The larvae have a total length of 6.2-7.2mm. The larvae that have been produced have been actively feeding. Juveniles all 10.25-15.00mm, all disappeared fins, began to appear hard fins, the external appearance is completely similar to adult fish. Juveniles are very active, prey on the initiative and have mutual food. Juveniles with a body length of 30-50mm can be caught along the coast in July-August.
2, the economic characteristics of black pods, its fresh meat, white, less fat, soft and hard palatability, especially steamed and soup, for everyone's pro-Lai. Because of fast growth. Adaptable, for the cage culture and industrial farming species.
3. Status of aquaculture Main breeding of black sea bream is the use of caisson cultivation in Shandong Changdao and cage farming in Shandong Rongcheng, as it can naturally overwinter in the North Sea area, thus reducing the wintering session, saving the cost of being welcomed by the majority of farmers, in recent years farming scale From the trial development to several hundred thousand, the price is 40-50 yuan/kg in Tianjin and Beijing market. There are also some breeding units in Lianyungang sea area that are actively making preparations, and plan to carry out bulk cage culture in this area next year.
4. Economic Benefit Analysis According to the current situation of breeding in Shandong Rongcheng and other places, the cage investment is 1000 yuan/only, the seed is 2 yuan/tail, the breeding cycle is 3 years, and the bait coefficient is 8, then:
1 Net cage input: 1,000 yuan/only 10 = 10,000 yuan (10 in each group, one person cares)
2 seed input: 2 yuan / tail 500 / cage 10 = 10000 yuan 3 bait cost: 500 / net 10 net 70% 1kg80.5 = 14000 yuan 4 staff salary: 10,000 yuan / year 3 years = 30000 yuan 5 Output value: 50070% 1kg 1040 yuan/kg = 140000 yuan 6 Benefits: 140,000 yuan, 1 million yuan, 1 million yuan, 14,000 yuan, 3 million yuan, 76,000 yuan. It can be seen that the economic benefits are considerable. The main problem is that the production cycle is long and it takes only 3 years to see the benefits. I am afraid that it is difficult for the average farmer to accept.
Second, nursery technology
1, broodstock. Artificially cultivated seedlings and naturally-occurring seeds can be used as nursery broodstock. It is also possible to collect wild fish that are to be littered directly into a litter pond, and do not use baits for a short period of time. However, in these cases, the survival rate is sometimes low.
Black scorpion young broodstock have a small calving size, early calving time, low temperature during the farrowing period, in the range of 12.4-14.8°C, and the output of larvae has a small deformity. The survival rate is over 46% in 7 days and 13.5 at the end. Above 5%, older broodstock have a large amount of litters, spawning time lags behind, and the water temperature is higher at the time of farrowing. Above 15°C, the abnormal rate of larvae produced lives up to 40% or more. The survival rate was below 22% within 7 days and gradually died with the nursery process. Therefore, in the selection of broodstock, 4-7 age, body length 38-45cm, body weight 1-1.5kg is appropriate. General broodstock with a total length of 40cm can produce 100,000 pigs, 150,000 pigs at 45cm, and 350,000 pigs at 50cm. However, different stocking densities of broodstock also have a greater impact on litter size.
The stocking of broodstock can be carried out in sea cages and land pools. Near the farrowing, the broodstock is moved into the indoor sink. The stocking density of broodstock is 3-5 fish/m3. The bait can be used to feed fish such as jadefish, sardines, and horse mackerel. It is fed once every other day. Light can be controlled at 1000-2000 gram. When the light is too strong, shading should be used. Change the water volume 2-10 cycles/day. Where the broodstock is lying on its side, disturbing its roaming, and when the lid is covered by more than one centimetre when breathing, the frequency is as high as 41-45 beats/minute, which is a sign of miscarriage.
2, larvae collection. The larvae produced were fed into a 0.5 cubic metre larval collection tank by the overflow outlet of the litter tank. Then put it into a bucket and let it stand for 10-15 minutes. The larvae with strong upper layers are counted by volumetric method and put into a larval rearing pond.
3, larval rearing
a, nurture the pool can refer to the truth.
b. Breeding density and water quality management.
After the temperature of the cultivation pond is adjusted to be the same as that of the farrowing pond (especially attention should be paid to raising the broodstock to promote its early calving), the larvae are fed into the pond at a density of 8000 to 15000 tail/m3. After the larvae enter the pond, they are stable when they increase the water temperature from 1°C to 18°C ​​every day, but they can also be incubated with natural water temperature, but they grow slowly. The water for bait breeding is sand-filtered seawater which is usually water-stopped within 10 days, and fresh seawater is properly added. To regulate the water quality and provide the rotifers with bait, the larvae are added and maintained at 300-800,000 cells/ml of chlorella within the larval rearing pool until 20-30 days of age. There are also some production units that use water to incubate during the addition of chlorella, but change the water after the fourth day, 1-2 times per day, 1/2-2/3 each time. The time for the start of water culture, as early as the 11th day and the late start from the 26th day, the temperature difference before and after the change of water should not exceed 1.5°C. In the early stages of cultivation, micro-inflation was appropriately strengthened with the growth of larvae. Water and air were inflated so that the pool water formed a circulation, and residual baits and feces were concentrated at the drainage holes. Besmear once every day or every other day from day 4.
c, bait.
The larvae of the newly hatched black sea bream have large splits and live feeding on the third day of output. The pre-cultivation foods used mainly include: rotifers, Artemia nauplii, developed Artemia, frozen adult Artemia, fresh or frozen fish eggs and larvae (ginger, black cockroach, cockroach, etc.), copepods, frozen Cladocera, fish, shrimp, meat, and foods. The opening bait is mainly rotifer, feeding at a density of 3-5/ml, and is adjusted depending on the amount of bait remaining in the morning. 6-7 days larvae more than 6.6mm total length, increase Artemia larvae hatching 0.5-1 / ml, the first 10-12 days, a total length of about 7.5mm, mainly Artemia larvae, keep 1.5-2 /ml, On the 25th to 26th days, the total length of more than 17mm began to be dominated by chopped clams, shrimps, and fish.
During the feeding process, a certain amount of live bait in the pool water must be maintained, and excessive surplus of bait should be controlled at the bottom of the pool by suction. In the early period of cultivation, the production of 500,000 tails of 24mm seedlings required approximately 50 billion rotifers, 5.1 billion Artemia nauplii, and 1.7 billion breeding insects.
Rotifers, Artemia nauplii, and cultivated Artemia need to be fortified prior to feeding (refer to true larvae).
When Japan was reared in the early stage of black seabream, the survival rate per unit of water (cubic meters) reached 5700-10420 and the survival rate was 53%. Practice has proved that the main factor influencing the survival rate of black cockroach nursery is the quality of the first-born larvae. With the use of young broodstock, the larvae produced are very active and have a high survival rate.
2 post-cultivation. When the juveniles are 75-30mm in length, the early breeding is completed. If high-density breeding is continued, the resulting mutual disability will result in massive deaths. Out-of-pool method: Use a compound feed to trap the juvenile fish to one place and suck it out with a siphon tube. The remaining can lower the water level, and the fish can be fished out with a net. The juveniles were transferred to a secondary culture pool or transferred to a sea cage for 2 cultures. Develop 5-12 cm large size fish species.
Breeding ponds and sea boxes can refer to real breeding.
The rearing stocking densities are: total length 30mm, 5000 tails/m3, total length 40mm, 2,500 tails/m3, total length 50mm, 1000 tails/m3 or more. Exceeding the following densities results in significant growth differences due to unbalanced ingestion among individuals, resulting in mutual disability and susceptibility to disease. The bait is mainly fish and shrimp meat with complex vitamins and bait. There are two kinds of bait and they are used alone. The compound feed should gradually increase the particle size of the feed according to the size of the fish in different stages of growth, and use palatability as a principle. The amount of feeding depends on the food intake, which is about 2.5-3.0% of the body weight of the fish. Land basin feeding can be fed 4 times a day, and sea cage feeding can be fed 2-3 times a day. In the rearing period, sorting should be repeated to avoid individual size differences. Adjusting the amount of stocking to maintain the appropriate density and changing water, the survival rate can be as high as more than 90%.
3 earthen pond nursery. Utilizing the numerous advantageous conditions of coastal ponds in China and combining with the biological characteristics of black sea bream, carrying out seedling cultivation in earthen ponds is a low cost and quick shortcut. Muping District, Yantai City, Shandong Province has accumulated rich experience in breeding seedlings of black earthworms. Specific operations can refer to soil pond nursery.
Third, to develop black locust fast growth, a wide range of temperature resistance, strong adaptability, less fish disease, bait conversion rate, aquaculture technology is simple, and the high price of commercial fish, is the sea cage and earth pond breeding of fine varieties. According to the actual situation in China, the development of earth pond culture should be the mainstay. The small earthen ponds can be used as a rear breeding pond or an intermediate cultivation pond. The large-sized fish species bred can be stocked in large and medium-sized earth ponds after indoor wintering, and can be used to produce commercial fish weighing 400-500 g in that year. Due to its low resistance to low temperatures (lowest tolerable 0.5°C) and low growth temperature, it is particularly suitable for coastal farming in northern China.
Japanese sea bream mainly uses sea cages (similar to other sea fish breeding net cages) and stocks about 10 cm in length. The growth of farmed fish is much faster than that of natural fish, and it is generally available in June the following year. 20cm, weight 160g, autumn fish up to 400-500g of commercial fish specifications.
Management during the cultivation mainly includes the following aspects:
1. The stocking density is generally 150-300 tails/m3 for 25g, 45-50 tails/m3 for 100g, 23-25 ​​tails/m3 for 200g, and 14-16 tails for 400g. /m3, 6-7 tail/m3 at 1000g.
2. Baits Feed the baits mainly on low-value fishes, shrimps and leftovers such as small scads, shrimps and scallops. Since the optimum temperature range of black cockroaches is 8-25°C, the optimum growth temperature is 14-22°C, so a small amount of feeding is started from 6-7°C, and when it is 14-22°C, it is fed twice a day and daily feeding is performed. The amount is controlled at 4-8% of body weight. During the wintering period, it gradually reduces and stops feeding.
3, water quality adjustment and sorting When changing the nets and earthen ponds, the management can refer to the black earthworms and try their best to maintain good water quality.
When cages are cultured, new nets are replaced in time for contamination and fish growth, and the necessary size sorting is performed in conjunction with network changes. This is the key to improving the survival rate.
IV. Disease Prevention and Control Black quail breeding is in its infancy. The diseases found are the same as those of true crickets and black locusts. There is nothing special about it. The prevention and treatment methods are the same as those of true maggots and black lice. The key is to strictly control the stocking density according to the regulations. Try to feed live bait.
1. Biological characteristics 1 Morphological characteristics and distribution. Black crickets are elongated and flat. Body length is generally 20-30cm, weight 100-300g. The kiss is more pointed, the mandible is longer than the maxilla, and the two jaws, the vomer and the cheekbone are finely toothed. There is a black line on the outside of the maxilla, the back of the head is low, and the back is pointed. Big eyes high. The interval between the eyes is approximately equal to the eye's eye, and there is a pure spine at the lower edge of the orbital bone. There are nicks in the middle of the dorsal fin, with 13 fin spines and 12 soft bars. Caudal fins rounded. Wearing a fine round scales. Gray and brown on the back and sides, with irregular black markings. Chest and belly gray. The dorsal fins are dark yellow and the rest of the fins are grayish black.
Black cloth in the western North Pacific. In the Yellow Sea and Bohai Sea in China and the East China Sea, the northern coast has been seen all year round. North Korea, Japan and southern Okhotsk are also distributed.
Black storks belong to the bottom-water fish of the warm waters. They like to inhabit shallow sea rocks or seaweed groves. They don't like light. Before the age of 2 inhabitants, they inhabited the rocky sea area with a water depth of less than 20m. Older fishes move along with their growth to the deep sea, and they swim back to the shore near the water depth of 20-30m near the farrowing period. This type does not travel long distances. However, in spring and autumn, with the change of water temperature, water groups can be formed and short distances can be traveled.
2 living habits. Black cockroaches are more resistant to low temperatures. Their optimum temperature range is 8-25°C, and they grow faster at 14-22°C. When the water temperature 5-6 °C then stop feeding. The lethal temperature is 1 °C.
Black cockroaches are carnivorous fish, miscellaneous fish, miscellaneous shrimp, shellfish, cephalopods, etc. can eat. The black sea bream in the Yellow Sea and Bohai Sea mainly eats small fish such as squid, yellow peony, fangshiyun, yujin fish, sardine, spot-fish, etc., as well as ridge-tailed brown shrimp, eagle claw shrimp, and cephalopods. Black crickets are very bulimia, stomach abundance is very high, the food intake is quite large, the daily food intake of younger fish can reach 7.5% of body weight, and the amount of satiety is about 11%.
3 grow. Black locust grows faster. According to the cage culture experiment in Changdao County, Shandong Province, the species of 7-18cm in length and 40-150g in body weight were placed on July 30 and measured on November 15th. The average body length was 25.5. Cm, the average weight is 485g. Continue wintering in the local sea area and continue growing in the following year. Before the 5th instar, the black storks grew fast, declined after the 5th instar, and decreased significantly after the 8th instar. From the perspective of cage culture in Yantai City, the 1~2cm seedlings culture can reach 250g in the second year and 600-800g in the third year, while the breeding sea catcher can reach 400g in the second year and 900-1000g in the third year. .
4 breeding habits. Black quail eggs raw fish. The male fish were 2-3 years old, and the female fish were sexually mature at 3 to 4 years of age. The breeding population consisted of 3 to 14 years of age. Among them, 3-4 male fish and 5-7 female fish were dominant. Male and female broodstock were copulated before and after November, after which the eggs developed into larvae in fertilized female fish, and they were produced again. The early litter water temperature is about 11°C, and the water temperature during the prosperous period is 13-16°C. The calving period of Shandong coastal indica is in April-May, and the peak period is in mid-May.
The litters usually have a smooth flow of water and fresh water in the reef sea area near the shore and inner bay. Larvae swim freely from the mother's output. The larvae have a total length of 6.2-7.2mm. The larvae that have been produced have been actively feeding. Juveniles all 10.25-15.00mm, all disappeared fins, began to appear hard fins, the external appearance is completely similar to adult fish. Juveniles are very active, prey on the initiative and have mutual food. Juveniles with a body length of 30-50mm can be caught along the coast in July-August.
2, the economic characteristics of black pods, its fresh meat, white, less fat, soft and hard palatability, especially steamed and soup, for everyone's pro-Lai. Because of fast growth. Adaptable, for the cage culture and industrial farming species.
3. Status of aquaculture Main breeding of black sea bream is the use of caisson cultivation in Shandong Changdao and cage farming in Shandong Rongcheng, as it can naturally overwinter in the North Sea area, thus reducing the wintering session, saving the cost of being welcomed by the majority of farmers, in recent years farming scale From the trial development to several hundred thousand, the price is 40-50 yuan/kg in Tianjin and Beijing market. There are also some breeding units in Lianyungang sea area that are actively making preparations, and plan to carry out bulk cage culture in this area next year.
4. Economic Benefit Analysis According to the current situation of breeding in Shandong Rongcheng and other places, the cage investment is 1000 yuan/only, the seed is 2 yuan/tail, the breeding cycle is 3 years, and the bait coefficient is 8, then:
1 Net cage input: 1,000 yuan/only 10 = 10,000 yuan (10 in each group, one person cares)
2 seed input: 2 yuan / tail 500 / cage 10 = 10000 yuan 3 bait cost: 500 / net 10 net 70% 1kg80.5 = 14000 yuan 4 staff salary: 10,000 yuan / year 3 years = 30000 yuan 5 Output value: 50070% 1kg 1040 yuan/kg = 140000 yuan 6 Benefits: 140,000 yuan, 1 million yuan, 1 million yuan, 14,000 yuan, 3 million yuan, 76,000 yuan. It can be seen that the economic benefits are considerable. The main problem is that the production cycle is long and it takes only 3 years to see the benefits. I am afraid that it is difficult for the average farmer to accept.
Second, nursery technology
1, broodstock. Artificially cultivated seedlings and naturally-occurring seeds can be used as nursery broodstock. It is also possible to collect wild fish that are to be littered directly into a litter pond, and do not use baits for a short period of time. However, in these cases, the survival rate is sometimes low.
Black scorpion young broodstock have a small calving size, early calving time, low temperature during the farrowing period, in the range of 12.4-14.8°C, and the output of larvae has a small deformity. The survival rate is over 46% in 7 days and 13.5 at the end. Above 5%, older broodstock have a large amount of litters, spawning time lags behind, and the water temperature is higher at the time of farrowing. Above 15°C, the abnormal rate of larvae produced lives up to 40% or more. The survival rate was below 22% within 7 days and gradually died with the nursery process. Therefore, in the selection of broodstock, 4-7 age, body length 38-45cm, body weight 1-1.5kg is appropriate. General broodstock with a total length of 40cm can produce 100,000 pigs, 150,000 pigs at 45cm, and 350,000 pigs at 50cm. However, different stocking densities of broodstock also have a greater impact on litter size.
The stocking of broodstock can be carried out in sea cages and land pools. Near the farrowing, the broodstock is moved into the indoor sink. The stocking density of broodstock is 3-5 fish/m3. The bait can be used to feed fish such as jadefish, sardines, and horse mackerel. It is fed once every other day. Light can be controlled at 1000-2000 gram. When the light is too strong, shading should be used. Change the water volume 2-10 cycles/day. Where the broodstock is lying on its side, disturbing its roaming, and when the lid is covered by more than one centimetre when breathing, the frequency is as high as 41-45 beats/minute, which is a sign of miscarriage.
2, larvae collection. The larvae produced were fed into a 0.5 cubic metre larval collection tank by the overflow outlet of the litter tank. Then put it into a bucket and let it stand for 10-15 minutes. The larvae with strong upper layers are counted by volumetric method and put into a larval rearing pond.
3, larval rearing
a, nurture the pool can refer to the truth.
b. Breeding density and water quality management.
After the temperature of the cultivation pond is adjusted to be the same as that of the farrowing pond (especially attention should be paid to raising the broodstock to promote its early calving), the larvae are fed into the pond at a density of 8000 to 15000 tail/m3. After the larvae enter the pond, they are stable when they increase the water temperature from 1°C to 18°C ​​every day, but they can also be incubated with natural water temperature, but they grow slowly. The water for bait breeding is sand-filtered seawater which is usually water-stopped within 10 days, and fresh seawater is properly added. To regulate the water quality and provide the rotifers with bait, the larvae are added and maintained at 300-800,000 cells/ml of chlorella within the larval rearing pool until 20-30 days of age. There are also some production units that use water to incubate during the addition of chlorella, but change the water after the fourth day, 1-2 times per day, 1/2-2/3 each time. The time for the start of water culture, as early as the 11th day and the late start from the 26th day, the temperature difference before and after the change of water should not exceed 1.5°C. In the early stages of cultivation, micro-inflation was appropriately strengthened with the growth of larvae. Water and air were inflated so that the pool water formed a circulation, and residual baits and feces were concentrated at the drainage holes. Besmear once every day or every other day from day 4.
c, bait.
The larvae of the newly hatched black sea bream have large splits and live feeding on the third day of output. The pre-cultivation foods used mainly include: rotifers, Artemia nauplii, developed Artemia, frozen adult Artemia, fresh or frozen fish eggs and larvae (ginger, black cockroach, cockroach, etc.), copepods, frozen Cladocera, fish, shrimp, meat, and foods. The opening bait is mainly rotifer, feeding at a density of 3-5/ml, and is adjusted depending on the amount of bait remaining in the morning. 6-7 days larvae more than 6.6mm total length, increase Artemia larvae hatching 0.5-1 / ml, the first 10-12 days, a total length of about 7.5mm, mainly Artemia larvae, keep 1.5-2 /ml, On the 25th to 26th days, the total length of more than 17mm began to be dominated by chopped clams, shrimps, and fish.
During the feeding process, a certain amount of live bait in the pool water must be maintained, and excessive surplus of bait should be controlled at the bottom of the pool by suction. In the early period of cultivation, the production of 500,000 tails of 24mm seedlings required approximately 50 billion rotifers, 5.1 billion Artemia nauplii, and 1.7 billion breeding insects.
Rotifers, Artemia nauplii, and cultivated Artemia need to be fortified prior to feeding (refer to true larvae).
When Japan was reared in the early stage of black seabream, the survival rate per unit of water (cubic meters) reached 5700-10420 and the survival rate was 53%. Practice has proved that the main factor influencing the survival rate of black cockroach nursery is the quality of the first-born larvae. With the use of young broodstock, the larvae produced are very active and have a high survival rate.
2 post-cultivation. When the juveniles are 75-30mm in length, the early breeding is completed. If high-density breeding is continued, the resulting mutual disability will result in massive deaths. Out-of-pool method: Use a compound feed to trap the juvenile fish to one place and suck it out with a siphon tube. The remaining can lower the water level, and the fish can be fished out with a net. The juveniles were transferred to a secondary culture pool or transferred to a sea cage for 2 cultures. Develop 5-12 cm large size fish species.
Breeding ponds and sea boxes can refer to real breeding.
The rearing stocking densities are: total length 30mm, 5000 tails/m3, total length 40mm, 2,500 tails/m3, total length 50mm, 1000 tails/m3 or more. Exceeding the following densities results in significant growth differences due to unbalanced ingestion among individuals, resulting in mutual disability and susceptibility to disease. The bait is mainly fish and shrimp meat with complex vitamins and bait. There are two kinds of bait and they are used alone. The compound feed should gradually increase the particle size of the feed according to the size of the fish in different stages of growth, and use palatability as a principle. The amount of feeding depends on the food intake, which is about 2.5-3.0% of the body weight of the fish. Land basin feeding can be fed 4 times a day, and sea cage feeding can be fed 2-3 times a day. In the rearing period, sorting should be repeated to avoid individual size differences. Adjusting the amount of stocking to maintain the appropriate density and changing water, the survival rate can be as high as more than 90%.
3 earthen pond nursery. Utilizing the numerous advantageous conditions of coastal ponds in China and combining with the biological characteristics of black sea bream, carrying out seedling cultivation in earthen ponds is a low cost and quick shortcut. Muping District, Yantai City, Shandong Province has accumulated rich experience in breeding seedlings of black earthworms. Specific operations can refer to soil pond nursery.
Third, to develop black locust fast growth, a wide range of temperature resistance, strong adaptability, less fish disease, bait conversion rate, aquaculture technology is simple, and the high price of commercial fish, is the sea cage and earth pond breeding of fine varieties. According to the actual situation in China, the development of earth pond culture should be the mainstay. The small earthen ponds can be used as a rear breeding pond or an intermediate cultivation pond. The large-sized fish species bred can be stocked in large and medium-sized earth ponds after indoor wintering, and can be used to produce commercial fish weighing 400-500 g in that year. Due to its low resistance to low temperatures (lowest tolerable 0.5°C) and low growth temperature, it is particularly suitable for coastal farming in northern China.
Japanese sea bream mainly uses sea cages (similar to other sea fish breeding net cages) and stocks about 10 cm in length. The growth of farmed fish is much faster than that of natural fish, and it is generally available in June the following year. 20cm, weight 160g, autumn fish up to 400-500g of commercial fish specifications.
Management during the cultivation mainly includes the following aspects:
1. The stocking density is generally 150-300 tails/m3 for 25g, 45-50 tails/m3 for 100g, 23-25 ​​tails/m3 for 200g, and 14-16 tails for 400g. /m3, 6-7 tail/m3 at 1000g.
2. Baits Feed the baits mainly on low-value fishes, shrimps and leftovers such as small scads, shrimps and scallops. Since the optimum temperature range of black cockroaches is 8-25°C, the optimum growth temperature is 14-22°C, so a small amount of feeding is started from 6-7°C, and when it is 14-22°C, it is fed twice a day and daily feeding is performed. The amount is controlled at 4-8% of body weight. During the wintering period, it gradually reduces and stops feeding.
3, water quality adjustment and sorting When changing the nets and earthen ponds, the management can refer to the black earthworms and try their best to maintain good water quality.
When cages are cultured, new nets are replaced in time for contamination and fish growth, and the necessary size sorting is performed in conjunction with network changes. This is the key to improving the survival rate.
IV. Disease Prevention and Control Black quail breeding is in its infancy. The diseases found are the same as those of true crickets and black locusts. There is nothing special about it. The prevention and treatment methods are the same as those of true maggots and black lice. The key is to strictly control the stocking density according to the regulations. Try to feed live bait.
Black Goij berry
Black Goji Berry is the herb originated in China. It is the richest in nutrient call oligomeric roanthocyanidins, which helps to eliminate toxins. This nutrient have great antioxidant properties and can be used for cancer prevention. Black goji berry is know to have powerful antioxidant and anti-aging properties to delays the aging process and helps you to look young
Black Goji berry Grade Three Description
Product Name: Black Goji berry
Place of Origin : China(Mainland)
Cultivation Type: Natural, Open Air
Grade: Grade Three
Shape: Oval
Color: Black
Taste: Sweet
Drying Process: AD
Max. Moisture(%): 13%
Use Method : Medicinal, edible and healthy value
Packaging: bulk packing 4 kg/aluminum foil bag, 16kg/carton
Net Weight : 16kg
Gross Weight : 17.5kg
Carton size : 51x37x29cm
Storage: Dried and cool place, Ventilation, Moisture proof
Shelf Life : 18 months
Certificate: Eurofins Certificate, SGS Certificate
MOQ: 100kg
Payment: T/T, Western Union, L/C, D/P
Delivery: 15 working days after down payment (deposit)
Departure Port: Tianjin/Qingdao
Loading: 11.5 Tons/1*20GP container
CIQ Certificate: QUALITY&QUANTITY&WEIGHT CERTIFICAT, PHYTOSANTARY CERTIFICATE ,SANITARY CERTIFICATE,HEALTH CERTIFICATE
FAQ:
Q: How about payment terms?
A: 30% TT deposit+70% TT before shipment, 30% TT deposit+70% TT balance against scanned Copy B/L, Flexible payment can be negotiated.
Q: Production and deliver
A: After deposit, goji berry order enter into 1st stage( production, packaging, factory inspect, etc), then 2nd stage is CIQ inspection and written CIQ Certificate lead time one week(7 days), 3rd stage we arrenge cargo shipment to departure port. Vessel lead time as per destination port in different countries( Such as North America line, South America Line, EMP, Asia, Australia, etc )
Black Goji Berries Grade Three
Black Goji Berries Grade Three,Organic Black Berries,Pure Black Goji Berries,Natural Black Goji Berries
Ningxia Baishi Hengxing Food Technology Co., Ltd. , https://www.chinagojihome.com