In recent years, the sea cucumber aquaculture area in the north has been expanding year by year, and farmers’ demand for large-sized seedlings of sea cucumber has been increasing. For this reason, the sea cucumber seedlings in the plastic greenhouse have emerged. The technical points are now described as follows:
First, the choice of site Plastic greenhouses should be built in convenient transportation, fresh sea water, small waves, pollution-free coast. The greenhouse is east-west and the roof is covered with straw, which is conducive to shading and heat preservation. General greenhouse construction area of ​​about 1000m2. In the greenhouse, the concrete pool is rectangular, with an aspect ratio of 3:2, a pool depth of about 1.5m, and an effective water body of about 20m3 per pool, facilitating operation and management. Facilities supporting the shed include sand canisters and intake and drainage systems, including seawater wells.
Second, the requirements of water quality
1. Salinity: The maximum salinity of sea cucumber is 15‰ to 33‰. The 4mm-long juvenile ginseng has a suitable salt lower limit of 20 ‰ to 25 ‰, and juvenile juvenile ginseng has a suitable development range of 26 ‰ ‰ to 32 ‰. The sea cucumber seedlings are in a rainy season in summer and can easily cause a sharp drop in salinity in the short term, especially in some sheds near the estuary and in the seawater wells affected by the upper reaches of freshwater. The salinity of seawater is often measured during the rainy season to avoid pumping. Into the low salinity of seawater caused by seedling loss.
2. Water temperature: Stichopus japonicus enters the state of hibernation at temperatures above 20°C in the natural sea area. The highest growth temperature of juveniles is 24°C to 26°C, and if they are above 27°C for a long time, they will stop growing or even die. The main method for controlling water temperature is to use underground sea water, and the temperature of underground seawater in the Longkou area is generally around 18°C ​​in the summer and about 14°C in the winter.
3. Water quality: The juveniles and juveniles are cultivated during the high temperature season. The amount of dissolved oxygen in the seawater is reduced, protozoa, microorganisms, copepods and other species multiply, and the water quality conditions are unstable. Therefore, jujube and juveniles should be filtered with sand during the initial stages of cultivation.
III. Purchase and holding of juvenile seedlings
1. The purchase of juvenile cucumber seedlings (1) should be selected with uniform seedling volume, neat specifications, microscopic examination without malformation, no lesions of juvenile parameters, the size of the best 2mm ~ 4mm or so.
(2) The dry transport method is generally used, along with the attachment base and framework of the nursery. Light should be avoided during transportation to prevent air drying to improve the survival rate of seedlings. Due to the small number of individuals and poor resistance to air-drying, in order to ensure the survival rate, seedlings are generally purchased on-site to avoid long-distance transportation.
2. Temporary rearing of juvenile cucumber seedlings (1) The juvenile cucumber seedlings should pay attention to disinfection and sterilization of the pool before entering the pond, and new ponds should also pay attention to changes in the pH value;
(2) The temperature difference between juvenile and inbred seedlings entering the pond should be controlled below 2°C (the nursery pond and the seedling nursery pond), and the salinity difference should be controlled within 3 inches.
Fourth, juvenile Senate - young ginseng seedling period management
1. Controlling seedling density: Maintaining a reasonable density is one of the key measures to increase seedling maintenance. In general, 2 mm to 4 mm of juvenile ginseng maintains a seedling density of 200,000 heads per cubic meter of water. With the increase of individuals, the density should be continuously sparse. Otherwise, the density is too large. As a result, the activity space of the ginseng on the attachment base is reduced, and sufficient bait is not eaten, resulting in malnutrition, slow growth, and increased mortality. There are two methods for sparse seedlings. One is to attach the attachment base with excessive seedling density, flush some of the juveniles to the empty attachment base in the water, and the other is to separate the corrugated board or plastic film one by one and then in the neutral position. Insert empty corrugated board or plastic film, and after a few days, the seedlings can be attached evenly.
2. Feeding delicious bait: In the early stage of seedling preservation, fresh sea mud is mainly used for feeding. In the later period, fresh sea mud and ratophyllal liquid can be mixed and fed. Daily feeding is 4-6 times, and the daily feeding amount is generally 10g/day. M3 ~ 20g/m3 or so, if necessary, according to the situation of seedlings feeding at any time increase or decrease; to the winter can be single-pull dry powder of rat algae, 2 times a day, the amount of daily feeding in 5g/m3 or so. The water temperature is higher than 25°C, and no feeding is required when the temperature is lower than 5°C.
3. Water Quality Management (1) In the summer high temperature season, 2 to 3 full-quantity waters are exchanged daily, and the best conditional flow is the best;
(2) inverted pool: summer high temperature season 4 days to 6 days down the pool 1 times, about 10 days in winter down the pool 1 times, after the pool to be strictly disinfected before use.
V. Disease prevention and treatment Common diseases include cockroach (mainly fierce blister) injury, ulceration disease and enteritis. First of all, it is necessary to take precautions. Attachment bases should be strictly washed and disinfected before use, and the amount of water exchanged during the cultivation period should be increased to keep the water quality fresh. The pool should be poured on time and the residual baits and feces should be thoroughly removed. During the hot season, try to lift water at night, pay attention to window ventilation. When feeding fresh sea mud and fresh squid mill graze, 5ppm crystal trichlorfon must be applied 2 hours in advance to kill the copepods and the fierce otters. Once the disease is found, it should be treated promptly. The method of killing copepods is to apply 2 ppm to 3 ppm of crystal trichlorfon, changing the water after 5 to 6 hours, and 2 ppm to 3 ppm of oxytetracycline can be used for the treatment of ulcerative disease and enteritis, each course of treatment for 3 days.
6. Summary The practice has proved that the use of plastic greenhouses to protect thorn seedlings has three advantages: First, a long growth time. Due to the use of underground sea water to regulate water temperature, it can ensure that the seedlings grow at a suitable temperature and avoid the sea cucumbers sleeping in the winter and can extend the growth period for more than 5 months. Therefore, the seedlings grow quickly, and the individuals are large. 4cm to 6cm, large individuals up to 8cm. The second is high survival rate and good economic benefits. Due to the artificial regulation of the living conditions of the ginseng, the seedling maintenance rate is high, generally about 30%. A shed has an annual income of about 2 million yuan and a profit of more than 1 million yuan. The third is to make room for nursery to engage in other nursery and improve the utilization rate of nursery.
First, the choice of site Plastic greenhouses should be built in convenient transportation, fresh sea water, small waves, pollution-free coast. The greenhouse is east-west and the roof is covered with straw, which is conducive to shading and heat preservation. General greenhouse construction area of ​​about 1000m2. In the greenhouse, the concrete pool is rectangular, with an aspect ratio of 3:2, a pool depth of about 1.5m, and an effective water body of about 20m3 per pool, facilitating operation and management. Facilities supporting the shed include sand canisters and intake and drainage systems, including seawater wells.
Second, the requirements of water quality
1. Salinity: The maximum salinity of sea cucumber is 15‰ to 33‰. The 4mm-long juvenile ginseng has a suitable salt lower limit of 20 ‰ to 25 ‰, and juvenile juvenile ginseng has a suitable development range of 26 ‰ ‰ to 32 ‰. The sea cucumber seedlings are in a rainy season in summer and can easily cause a sharp drop in salinity in the short term, especially in some sheds near the estuary and in the seawater wells affected by the upper reaches of freshwater. The salinity of seawater is often measured during the rainy season to avoid pumping. Into the low salinity of seawater caused by seedling loss.
2. Water temperature: Stichopus japonicus enters the state of hibernation at temperatures above 20°C in the natural sea area. The highest growth temperature of juveniles is 24°C to 26°C, and if they are above 27°C for a long time, they will stop growing or even die. The main method for controlling water temperature is to use underground sea water, and the temperature of underground seawater in the Longkou area is generally around 18°C ​​in the summer and about 14°C in the winter.
3. Water quality: The juveniles and juveniles are cultivated during the high temperature season. The amount of dissolved oxygen in the seawater is reduced, protozoa, microorganisms, copepods and other species multiply, and the water quality conditions are unstable. Therefore, jujube and juveniles should be filtered with sand during the initial stages of cultivation.
III. Purchase and holding of juvenile seedlings
1. The purchase of juvenile cucumber seedlings (1) should be selected with uniform seedling volume, neat specifications, microscopic examination without malformation, no lesions of juvenile parameters, the size of the best 2mm ~ 4mm or so.
(2) The dry transport method is generally used, along with the attachment base and framework of the nursery. Light should be avoided during transportation to prevent air drying to improve the survival rate of seedlings. Due to the small number of individuals and poor resistance to air-drying, in order to ensure the survival rate, seedlings are generally purchased on-site to avoid long-distance transportation.
2. Temporary rearing of juvenile cucumber seedlings (1) The juvenile cucumber seedlings should pay attention to disinfection and sterilization of the pool before entering the pond, and new ponds should also pay attention to changes in the pH value;
(2) The temperature difference between juvenile and inbred seedlings entering the pond should be controlled below 2°C (the nursery pond and the seedling nursery pond), and the salinity difference should be controlled within 3 inches.
Fourth, juvenile Senate - young ginseng seedling period management
1. Controlling seedling density: Maintaining a reasonable density is one of the key measures to increase seedling maintenance. In general, 2 mm to 4 mm of juvenile ginseng maintains a seedling density of 200,000 heads per cubic meter of water. With the increase of individuals, the density should be continuously sparse. Otherwise, the density is too large. As a result, the activity space of the ginseng on the attachment base is reduced, and sufficient bait is not eaten, resulting in malnutrition, slow growth, and increased mortality. There are two methods for sparse seedlings. One is to attach the attachment base with excessive seedling density, flush some of the juveniles to the empty attachment base in the water, and the other is to separate the corrugated board or plastic film one by one and then in the neutral position. Insert empty corrugated board or plastic film, and after a few days, the seedlings can be attached evenly.
2. Feeding delicious bait: In the early stage of seedling preservation, fresh sea mud is mainly used for feeding. In the later period, fresh sea mud and ratophyllal liquid can be mixed and fed. Daily feeding is 4-6 times, and the daily feeding amount is generally 10g/day. M3 ~ 20g/m3 or so, if necessary, according to the situation of seedlings feeding at any time increase or decrease; to the winter can be single-pull dry powder of rat algae, 2 times a day, the amount of daily feeding in 5g/m3 or so. The water temperature is higher than 25°C, and no feeding is required when the temperature is lower than 5°C.
3. Water Quality Management (1) In the summer high temperature season, 2 to 3 full-quantity waters are exchanged daily, and the best conditional flow is the best;
(2) inverted pool: summer high temperature season 4 days to 6 days down the pool 1 times, about 10 days in winter down the pool 1 times, after the pool to be strictly disinfected before use.
V. Disease prevention and treatment Common diseases include cockroach (mainly fierce blister) injury, ulceration disease and enteritis. First of all, it is necessary to take precautions. Attachment bases should be strictly washed and disinfected before use, and the amount of water exchanged during the cultivation period should be increased to keep the water quality fresh. The pool should be poured on time and the residual baits and feces should be thoroughly removed. During the hot season, try to lift water at night, pay attention to window ventilation. When feeding fresh sea mud and fresh squid mill graze, 5ppm crystal trichlorfon must be applied 2 hours in advance to kill the copepods and the fierce otters. Once the disease is found, it should be treated promptly. The method of killing copepods is to apply 2 ppm to 3 ppm of crystal trichlorfon, changing the water after 5 to 6 hours, and 2 ppm to 3 ppm of oxytetracycline can be used for the treatment of ulcerative disease and enteritis, each course of treatment for 3 days.
6. Summary The practice has proved that the use of plastic greenhouses to protect thorn seedlings has three advantages: First, a long growth time. Due to the use of underground sea water to regulate water temperature, it can ensure that the seedlings grow at a suitable temperature and avoid the sea cucumbers sleeping in the winter and can extend the growth period for more than 5 months. Therefore, the seedlings grow quickly, and the individuals are large. 4cm to 6cm, large individuals up to 8cm. The second is high survival rate and good economic benefits. Due to the artificial regulation of the living conditions of the ginseng, the seedling maintenance rate is high, generally about 30%. A shed has an annual income of about 2 million yuan and a profit of more than 1 million yuan. The third is to make room for nursery to engage in other nursery and improve the utilization rate of nursery.
We introduce ourselves as the leading manufacturer of Cylinder
Liners, cylinder head ,Piston Crown ,piston skirt ,valve stem,Valve Seat ,valve
housing etc. since last 25years in China.
if you are having any inquiry regarding the products, please send us at your earliest.
Should you need further information please write to us, We are at your service.
if you are having any inquiry regarding the products, please send us at your earliest.
Should you need further information please write to us, We are at your service.
Diesel Engine Spare Parts,Engine Cylinder Liner,Engine Piston,Marine Engine Spare Parts,Diesel Generator Spare Parts
ZhouShan HeCheng Machinery Co., LTD. , https://www.hcmarineparts.com