First, intermediate cultivation
Hsu's flat fish grows from 2.6 to 3.0 millimeters in size, and can scavenge a large number of dead baits such as fish flesh, and should promptly go out of the pond to cultivate young fish. At present, the main training method is the cultivation of sea cages. There is no uniform standard for the shape and specification of the cages used. The factors such as the convenience of operation and management, and the ability to resist wind and waves are emphasized. Place the cages in the sea area where the water quality is fresh, the flow is smooth, there are few waves, there is no pollution, and the water depth is suitable for the sediment texture. The size of the net is determined by the size of the fish to be reared. With the growth of individual fish, the net size of the net increases accordingly, and the net lines are correspondingly bold. Two to three centimeters of seedlings that had just emerged from the pool were cages made from screen mesh.
Stocking density
The stocking density during the mid-cultivation period depends on different specifications of the seedlings. Generally, the seedlings of 2 cm to 3 cm in length are distributed at about 300/m3, and the fish species of 8 cm to 10 cm in length are about 100/m3.
2. Feeding
The bait is dominated by small fish, with some shrimp. The bait size should be palatable. The fish fleas should be used as the main ingredient in the early stage and the minced fish pieces should be used in the later period until the larger fish and small fish are fed. Adhere to a small number of principles when feeding, early 2 to 4 times a day, late to 2 to 3 times a day. The daily bait rate is 10% to 40%, depending on the fish's diet and adjustments are made at any time.
3. Daily management
It is one of the most important management tasks for cage fish farming to clear the attached organisms on the cage and ensure the exchange of water inside and outside the cage. At present, the most effective method, especially in the breeding season, is to change the net at a proper time. Normally after 20 days to 30 days breeding, the number of organisms attached to the cage reaches a certain amount, and the fish species also grow to larger specifications. At this time, a clean net cage replaced with a large net is necessary to maintain the exchange of water inside and outside the cage and the management of the next step. In addition, the removal of attachments to cages can also be performed with a high pressure water gun, which can also achieve better results. Security inspection is another important management task. Regular and temporary inspections should be conducted. Regular inspections are best performed after calm or feeding. Temporary inspections are mainly carried out before and after heavy winds or typhoons. Check the damage of the nets, the activities of the fish, and the invasion of enemy creatures. We must conscientiously do a good job in the "three defenses": prevention of disease, escape prevention, and prevention of enemies. In the daily management process, the major water quality factors in the sea area and cages should be measured regularly or at any time. Memorize the cage fish culture log, including weather, wind direction, wind power, water temperature, etc., and also regularly perform fish growth and other items, as a basis for adjustment of feeding amount and management at each stage, and summarize experience for future work.
Second, adult fish breeding
After the end of the winter in the sea or onshore pool, it will be transferred to adult fish management in the spring of the next year.
Stocking density
Hsu's flatfish are cultured from cages, and the stocking density depends on the conditions of the setting of the cages and the level of culture techniques. Generally, the unit yield of 10 kg/m3 to 20 kg/m3 is targeted for stocking management.
2. Feed and feeding
The bait is mainly composed of fresh and mixed fish, and with some shellfish waste and additives, formula feed is made. The food pellets should be suitable for prandial, and the daily bait rate should be 3% to 10%, and it should be fed twice daily. When feeding, it is necessary to grasp the principle of a small amount of diligence. When feeding, try to avoid loss of food and sink into the bottom of the box to reduce the waste of food.
3. Growth and survival rate
In the Shandong area, about 70 grams of fish species are stocked at the beginning of April, and after 8 months to 9 months of raising, commercial fish specifications of more than 300 grams can be achieved. Its survival rate can reach more than 85%, and the unit fish output can reach nearly 30 kg/m3. The feed coefficient is 5-7.
In addition, according to the experience of cage culture scallops, a 1.3-meter-high cage was used for the hovering test of Hsu's flatfish, and very good results were obtained. This method has certain advantages compared with cages: the depth of the cage can be controlled at any time, so it can avoid the impact of sea storms, but also according to the changes in the weather, by adjusting the water depth, to adapt to the bottom Habitat habits. From the 30th of July, 150 grams of stocked fish were reared to 486 grams on November 15 of that year. After wintering, it reached 654 grams on July 15 of the second year. The feed coefficient was 6.7, and the survival rate of overwintering reached 98%. Its economic benefits are also significant. However, this method is labor-intensive and it is difficult to form large-scale production.
Hsu's flatfish can be sold after being bred for 2 years to reach a commercial size of about 300-500 g. At this time, the net cages are picked up by dip nets, and live water tanks or other containers are placed on the live fish supply market or frozen. After processing into deep processing products such as fish fillets, it enters the market.
Hsu's flat fish grows from 2.6 to 3.0 millimeters in size, and can scavenge a large number of dead baits such as fish flesh, and should promptly go out of the pond to cultivate young fish. At present, the main training method is the cultivation of sea cages. There is no uniform standard for the shape and specification of the cages used. The factors such as the convenience of operation and management, and the ability to resist wind and waves are emphasized. Place the cages in the sea area where the water quality is fresh, the flow is smooth, there are few waves, there is no pollution, and the water depth is suitable for the sediment texture. The size of the net is determined by the size of the fish to be reared. With the growth of individual fish, the net size of the net increases accordingly, and the net lines are correspondingly bold. Two to three centimeters of seedlings that had just emerged from the pool were cages made from screen mesh.
Stocking density
The stocking density during the mid-cultivation period depends on different specifications of the seedlings. Generally, the seedlings of 2 cm to 3 cm in length are distributed at about 300/m3, and the fish species of 8 cm to 10 cm in length are about 100/m3.
2. Feeding
The bait is dominated by small fish, with some shrimp. The bait size should be palatable. The fish fleas should be used as the main ingredient in the early stage and the minced fish pieces should be used in the later period until the larger fish and small fish are fed. Adhere to a small number of principles when feeding, early 2 to 4 times a day, late to 2 to 3 times a day. The daily bait rate is 10% to 40%, depending on the fish's diet and adjustments are made at any time.
3. Daily management
It is one of the most important management tasks for cage fish farming to clear the attached organisms on the cage and ensure the exchange of water inside and outside the cage. At present, the most effective method, especially in the breeding season, is to change the net at a proper time. Normally after 20 days to 30 days breeding, the number of organisms attached to the cage reaches a certain amount, and the fish species also grow to larger specifications. At this time, a clean net cage replaced with a large net is necessary to maintain the exchange of water inside and outside the cage and the management of the next step. In addition, the removal of attachments to cages can also be performed with a high pressure water gun, which can also achieve better results. Security inspection is another important management task. Regular and temporary inspections should be conducted. Regular inspections are best performed after calm or feeding. Temporary inspections are mainly carried out before and after heavy winds or typhoons. Check the damage of the nets, the activities of the fish, and the invasion of enemy creatures. We must conscientiously do a good job in the "three defenses": prevention of disease, escape prevention, and prevention of enemies. In the daily management process, the major water quality factors in the sea area and cages should be measured regularly or at any time. Memorize the cage fish culture log, including weather, wind direction, wind power, water temperature, etc., and also regularly perform fish growth and other items, as a basis for adjustment of feeding amount and management at each stage, and summarize experience for future work.
Second, adult fish breeding
After the end of the winter in the sea or onshore pool, it will be transferred to adult fish management in the spring of the next year.
Stocking density
Hsu's flatfish are cultured from cages, and the stocking density depends on the conditions of the setting of the cages and the level of culture techniques. Generally, the unit yield of 10 kg/m3 to 20 kg/m3 is targeted for stocking management.
2. Feed and feeding
The bait is mainly composed of fresh and mixed fish, and with some shellfish waste and additives, formula feed is made. The food pellets should be suitable for prandial, and the daily bait rate should be 3% to 10%, and it should be fed twice daily. When feeding, it is necessary to grasp the principle of a small amount of diligence. When feeding, try to avoid loss of food and sink into the bottom of the box to reduce the waste of food.
3. Growth and survival rate
In the Shandong area, about 70 grams of fish species are stocked at the beginning of April, and after 8 months to 9 months of raising, commercial fish specifications of more than 300 grams can be achieved. Its survival rate can reach more than 85%, and the unit fish output can reach nearly 30 kg/m3. The feed coefficient is 5-7.
In addition, according to the experience of cage culture scallops, a 1.3-meter-high cage was used for the hovering test of Hsu's flatfish, and very good results were obtained. This method has certain advantages compared with cages: the depth of the cage can be controlled at any time, so it can avoid the impact of sea storms, but also according to the changes in the weather, by adjusting the water depth, to adapt to the bottom Habitat habits. From the 30th of July, 150 grams of stocked fish were reared to 486 grams on November 15 of that year. After wintering, it reached 654 grams on July 15 of the second year. The feed coefficient was 6.7, and the survival rate of overwintering reached 98%. Its economic benefits are also significant. However, this method is labor-intensive and it is difficult to form large-scale production.
Hsu's flatfish can be sold after being bred for 2 years to reach a commercial size of about 300-500 g. At this time, the net cages are picked up by dip nets, and live water tanks or other containers are placed on the live fish supply market or frozen. After processing into deep processing products such as fish fillets, it enters the market.
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