Sturgeon fry breeding techniques and advantages
The entrance of the Yellow River into the sea is the main origin of the eel fry, and the raising of the survival rate of natural seedlings in Haipu has made the eel a key breeding species in the Yellow River Delta. In 1998, 1999 and 2000, we used the old shrimp ponds in the shrimp farms in Dongying City, relying on the cultivation of basic biological feeds to temporarily raise the sea catch, which has been successful for three consecutive years and has accumulated some practical experience. Has achieved significant economic benefits. This achievement has been identified by experts organized by the Shandong Provincial Science and Technology Commission and has reached the domestic leading level. The relevant technology is introduced as follows:
I. Holding technology
1. Condition of the pond: Using the No. 5 shrimp pond of the No. 1 team of the shrimp farm in Dongying City, with an area of ​​50 mu, which is rectangular and has a central ditch. There are inlet gates and drainage gates. The maximum depth is 2 meters and the minimum is 1 meter. 1.8 meters. The bottom of the pool is muddy sandy bottom and has not been dredged.
2. Stocking preparation: Before the stocking, drain the pool water and disinfect with quicklime. The dosage is 75 kg/mu. The whole pool was evenly dry and limed, and the amount of sludge was more sprinkled. Water was added after 48 hours. The aquaculture water is taken from the trenches at the intersection of the Guangli River and the Yihong River. There is fresh water under the row, and there is a tide of seawater. The salinity is 5‰ to 15‰ brackish water. After the water temperature rises in the spring, the water will naturally grow in abundance. The silkworms, clams, prawns, horns, etc., are used as the basic bait for salmon. Every year on the 10th of March, the water is introduced, and the Yangshui Station draws high tide water. When the water is received, the inlet gate presses to enlarge the mesh cone-type water inlet net. The purpose is to incorporate cocoon silkworms, large-clad horns, clams, small green prawns and their eggs into the pool, and a drainage gate is placed on the 20-mesh board net. Two days after the first influent, the pool water will be drained, so that it will be washed twice in the holding pool. Close the drainage gate and gradually incorporate 80 cm of water to allow it to naturally reproduce the basic biological feed (since the pond is an old pond that has been used for many years, it is not dredged, and organic matter is abundant, so it is not necessary to use chemical fertilizers and water).
3. Seed stocking: At the end of March, the carp seedlings that naturally grow in the sea mouth are caught. The seedling size is 1.5 cm to 3.0 cm, and the seawater salinity at the sea inlet is 20 feet. Right and left, the seedlings in the pond must be treated with desalination. One way to do this is to exclude weak and injured, and second, to prevent excessive salinity. The same as the pool seedlings specifications as far as possible, into the pool interval should not exceed 7 days, so as to avoid the formation of size differentiation, mutual residual food.
4. The main technical measures during the holding period
(1) Water quality management: The general requirement is to maintain the relative stability of the water environment, because the water comes from the sea and freshwater interchanges, changes are large, the physical and chemical indicators are not stable, and the first 15 days after seedlings should only enter the high-tide water Each tide of water is 10 centimeters to ensure that the salinity of the pool water is more than 10 feet, and the pool water level is increased to 1.8 meters. In the process of entering the water, when the water level of the pool is about 50 cm from the bottom of the intake, the water inlet net should be replaced with an 8 mesh nylon net to prevent the fish from fleeing back. Every 10 cm to 20 cm of water will be changed every time to ensure that the water is fresh and promote the growth of food.
(2) Feed creatures: The seedlings of carp mainly prey on the natural prawn, large branches, etc. in the pond. Should be every few days, with a small self-made pull nets in the pool water 1 meters to 2 meters, if you can capture a large number of shrimp, horns, etc., that the pool of food within the organism is sufficient. If it is not enough, it is possible to transplant naturally harvested live prawn or feed fresh prawn.
Second, several issues that should be noted Through the three-year holding test, the author believes that in order to raise the survival rate of eel fry, we must do a good job in the following three tasks: First, do a good job of seedlings into the pool, the pool seedlings should be constitution Robust, non-injury, neat in size and concentrated in time; the second is to maintain the relative stability of the pool water environment, due to the variable characteristics of the water source physicochemical factors in the sea and river channels, so the intake and drainage should be appropriate; the third is to ensure There are enough food creatures in the holding pool.
Third, the advantages of the holding technology
1. Seedlings grown under low salt conditions are easy to sell. It is very difficult for carp to winter in the high salt waters of the north, and it can be used for winter in brackish waters. In the Yellow River estuary area, fresh water, surface water seepage, and underground brine have been used to make brackish water. Farming squid has been successful. Therefore, the prospects for the cultivation of carp seedlings in low salt water areas are promising.
2. The shrimp pond can be fully utilized to increase the utilization rate of the shrimp pond, reduce the risk of breeding and increase the breeding efficiency. The carp is raised until the end of May, and it can continue to stock shrimps such as Chinese shrimp, Penaeus vannamei, and new prawns such as shrimp, which are suitable for low-salt growth. A small amount of skippable carp can also catch diseased weak prawns and reduce the chance of shrimp disease outbreak. .
I. Holding technology
1. Condition of the pond: Using the No. 5 shrimp pond of the No. 1 team of the shrimp farm in Dongying City, with an area of ​​50 mu, which is rectangular and has a central ditch. There are inlet gates and drainage gates. The maximum depth is 2 meters and the minimum is 1 meter. 1.8 meters. The bottom of the pool is muddy sandy bottom and has not been dredged.
2. Stocking preparation: Before the stocking, drain the pool water and disinfect with quicklime. The dosage is 75 kg/mu. The whole pool was evenly dry and limed, and the amount of sludge was more sprinkled. Water was added after 48 hours. The aquaculture water is taken from the trenches at the intersection of the Guangli River and the Yihong River. There is fresh water under the row, and there is a tide of seawater. The salinity is 5‰ to 15‰ brackish water. After the water temperature rises in the spring, the water will naturally grow in abundance. The silkworms, clams, prawns, horns, etc., are used as the basic bait for salmon. Every year on the 10th of March, the water is introduced, and the Yangshui Station draws high tide water. When the water is received, the inlet gate presses to enlarge the mesh cone-type water inlet net. The purpose is to incorporate cocoon silkworms, large-clad horns, clams, small green prawns and their eggs into the pool, and a drainage gate is placed on the 20-mesh board net. Two days after the first influent, the pool water will be drained, so that it will be washed twice in the holding pool. Close the drainage gate and gradually incorporate 80 cm of water to allow it to naturally reproduce the basic biological feed (since the pond is an old pond that has been used for many years, it is not dredged, and organic matter is abundant, so it is not necessary to use chemical fertilizers and water).
3. Seed stocking: At the end of March, the carp seedlings that naturally grow in the sea mouth are caught. The seedling size is 1.5 cm to 3.0 cm, and the seawater salinity at the sea inlet is 20 feet. Right and left, the seedlings in the pond must be treated with desalination. One way to do this is to exclude weak and injured, and second, to prevent excessive salinity. The same as the pool seedlings specifications as far as possible, into the pool interval should not exceed 7 days, so as to avoid the formation of size differentiation, mutual residual food.
4. The main technical measures during the holding period
(1) Water quality management: The general requirement is to maintain the relative stability of the water environment, because the water comes from the sea and freshwater interchanges, changes are large, the physical and chemical indicators are not stable, and the first 15 days after seedlings should only enter the high-tide water Each tide of water is 10 centimeters to ensure that the salinity of the pool water is more than 10 feet, and the pool water level is increased to 1.8 meters. In the process of entering the water, when the water level of the pool is about 50 cm from the bottom of the intake, the water inlet net should be replaced with an 8 mesh nylon net to prevent the fish from fleeing back. Every 10 cm to 20 cm of water will be changed every time to ensure that the water is fresh and promote the growth of food.
(2) Feed creatures: The seedlings of carp mainly prey on the natural prawn, large branches, etc. in the pond. Should be every few days, with a small self-made pull nets in the pool water 1 meters to 2 meters, if you can capture a large number of shrimp, horns, etc., that the pool of food within the organism is sufficient. If it is not enough, it is possible to transplant naturally harvested live prawn or feed fresh prawn.
Second, several issues that should be noted Through the three-year holding test, the author believes that in order to raise the survival rate of eel fry, we must do a good job in the following three tasks: First, do a good job of seedlings into the pool, the pool seedlings should be constitution Robust, non-injury, neat in size and concentrated in time; the second is to maintain the relative stability of the pool water environment, due to the variable characteristics of the water source physicochemical factors in the sea and river channels, so the intake and drainage should be appropriate; the third is to ensure There are enough food creatures in the holding pool.
Third, the advantages of the holding technology
1. Seedlings grown under low salt conditions are easy to sell. It is very difficult for carp to winter in the high salt waters of the north, and it can be used for winter in brackish waters. In the Yellow River estuary area, fresh water, surface water seepage, and underground brine have been used to make brackish water. Farming squid has been successful. Therefore, the prospects for the cultivation of carp seedlings in low salt water areas are promising.
2. The shrimp pond can be fully utilized to increase the utilization rate of the shrimp pond, reduce the risk of breeding and increase the breeding efficiency. The carp is raised until the end of May, and it can continue to stock shrimps such as Chinese shrimp, Penaeus vannamei, and new prawns such as shrimp, which are suitable for low-salt growth. A small amount of skippable carp can also catch diseased weak prawns and reduce the chance of shrimp disease outbreak. .
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