CN102550457B - Early propagation method for hyriopsis cumingii seeds - Google Patents
Early propagation method for hyriopsis cumingii seeds Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses an early propagation method for hyriopsis cumingii seeds in methods for breeding hyriopsis cumingii. By the early propagation method for the hyriopsis cumingii seeds, the technology for early propagation of the hyriopsis cumingii is successfully developed for the first time in China, parent hyriopsis cumingii and seeds thereof are originally artificially bred in a greenhouse, early maturity of the gonads of the parent hyriopsis cumingii and quick growth of the seeds in early spring are promoted to succeed by adopting the technology of water temperature regulation and directional breeding of biological bait, and 80 percent of hyriopsis cumingii can reach the bead plugging specification; and the early propagation method for the hyriopsis cumingii seeds is technically characterized by mainly comprising the steps of selecting the parent hyriopsis cumingii, breeding the parent hyriopsis cumingii, collecting seedlings, breeding the hyriopsis cumingii seedlings at the parasitic stage, breeding juveniles after the seedlings are removed, breeding young hyriopsis cumingii and the like.
Description
Technical field
The present invention relates to the breeding method of a kind of hydriopsis cumingii, be specifically related to breeding method morning of the seed of a kind of hydriopsis cumingii.
Background technology
Hydriopsis cumingii is commonly called as freshwater mussel, pearl freshwater mussel, triangle freshwater mussel, it is a class Non-marine Bivalves mollusk, belong to lamellibranchiata, Eulamellibranchia, Unionidae, sail freshwater mussel belong to, and are distributed widely in the provinces such as Hunan, Hubei, Anhui, Jiangsu, Zhejiang, Jiangxi, especially distribute more with Poyang Lake and other large and medium-sized lakes, and output is higher, it is the distinctive outstanding fresh water pearl culturing clam of China.The hydriopsis cumingii of natural water area or cultivating pool generally April early and middle ten days start breeding, the 5-6 month is Period of reproductive peak, most freshwater mussel agriculture is in order to nursery in advance, the female freshwater mussel of hydriopsis cumingii of tens ripe hook Jie larvas in bosom is selected in the freshwater mussel of up to ten thousand, pond, this traditional seedling-cultivating method shortcoming is a lot, as: selected close freshwater mussel is not grown cultured pearls the good hydriopsis cumingii of performance, but cherish ripe hook Jie larva hydriopsis cumingii early; Workload is large, time and effort consuming; Large to the damage of hydriopsis cumingii of growing cultured pearls; Be subject to weather influence, emergence rate is low, Seedling production poor stability etc.For all the foregoing reasons, cause that early-breeding seedlings fry quality is low, quantity is few, Seedling production still mainly concentrates at the beginning of 5 months and posts seedling, posting the hydriopsis cumingii that seedling produces May supports to November then, major part little freshwater mussel can not reach inserted sheet specification, can only wait until spring in the coming year even autumn inserted sheet, greatly delay production of growing cultured pearls, shorten and grow cultured pearls the cycle, increase aquaculture cost and risk.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the deficiency in existing hydriopsis cumingii seedling-cultivating method, and the hydriopsis cumingii seed providing a kind of stable and high yields, freshwater mussel seedling excellent is breeding method early.
In order to solve the problem, technical scheme of the present invention is such:
A kind of hydriopsis cumingii seed early breeding method, comprises the following steps:
1 > parent freshwater mussel is selected: optimize energetic, shell not damaged, body weight is the close freshwater mussel with criticizing in freshwater mussel front 10%, and then it is wide long than the close freshwater mussel being greater than average proportions 15 ~ 20% with shell therefrom to select shell, as breeding close freshwater mussel;
2 > parent freshwater mussels are cultivated: adopt green house breeding method, build up close freshwater mussel mid-November and cultivate green house, area 2-3 is advisable in mu/pond, as early as possible preferred close freshwater mussel is linked into greenhouse after the water filling of pond in booth, in case greenhouse internal-external temperature difference becomes large, close freshwater mussel is made to produce temperature difference stress reaction and damage; Every mu of greenhouse only hangs close freshwater mussel 300-400, and close freshwater mussel greenhouse cultivation, after 2 months, can cherish ripe hook Jie larva to March in the coming year, notices whether make regular check on booth has breakage, and clean accumulated snow in time in cultivating process;
3 > collect seedling: picked out by female freshwater mussel of nourishing ripe hook Jie larva, dry in the shade 3h, put into fill fresh pond water post seedling aquarium, the density domination of hook Jie larva of host symptoms attachment is at 3 ~ 40,000/kg host symptoms, and all operations of collecting seedling in process all carries out in greenhouse;
4 > parasitic stages freshwater mussel seedlings are cultivated: the breeding density of host symptoms is with 1m
2put 1 ~ 1.5kg in nursery pond in a suitable place to breed to be advisable, nursery pond greenhouse is shading green house, to reduce the stimulation of illumination to host symptoms, cistern and larval rearing water are circulated, by the water extraction height temperature of fry nursing pool of cistern in printing opacity green house, nursery pond is 1: 5 with cistern water body volume ratio, cistern is regularly annotated new water, improvement water quality, environmentally temperature regulates the new water yield of filling, ensures that water temperature reduces and is no more than 2 DEG C; Hook Jie larva in parasitic fish drops to after at the bottom of nursery pond, parasitic fish is pulled out, enters young freshwater mussel breeding phase;
5 > are young freshwater mussel cultivation after taking off seedling: the breeding density of freshwater mussel seedling is 1m
2put freshwater mussel seedling 2 ~ 30,000 in nursery pond in a suitable place to breed, young freshwater mussel breeding phase lower water temperature is cultivated with parasitic stages freshwater mussel seedling;
6 > children freshwater mussels are cultivated: May, young freshwater mussel is proceeded to Wai great pond, greenhouse and cultivate, the breeding density of young freshwater mussel is that 100 ~ 150 freshwater mussel seedlings put in a suitable place to breed by every net cage, and per hectare puts 600,000 in a suitable place to breed.
In close freshwater mussel selected by step 1 >, sex ration is 3: 1, selects the close freshwater mussel time at the beginning of 11 months.
In step 2 >, before the water filling of pond, first remaining hydriopsis cumingii and other freshwater shellfishes at the bottom of pond is removed, avoid causing kind of matter pollution, a nutrient competition etc., then adopt lime disinfection, consumption is 60-80kg/ mu, finally adopts high light-passing plastic cloth and steel structure support thereof to build green house on pond, after green house is put up, pond water filling.
In step 3 >, described host symptoms is the yellow cartfish that physique is healthy and strong, travelling vivaciously, bright in colour, nothing wound is anosis, and body weight is best at 50 ± 10g, supports temporarily before adhering to hook Jie larva at seedling raising greenhouse.
In step 4 >, controlling water flow velocity in nursery pond is 1 ~ 1.5T/h.
In step 5 >, to control in nursery pond water flow velocity in advance the slow later stage fast, flow velocity 0.5 ~ 2T/h, night is greater than daytime.
In step 5 >, every day adds nutritive mud, in order to avoid mud is too much and occur the dead angle that mud is piled up, young freshwater mussel is caused to be embedded in wherein death by suffocation, the addition of nutritive mud is high consistent with the shell of young freshwater mussel, and severe quantization adds nutritive mud, once a day.
In step 5 >, at least grasp pond every day 2 times, evacuate freshwater mussel seedling, during behaviour pond, hand can not be encountered at the bottom of pond.
Beneficial effect: hydriopsis cumingii of the present invention early breeding method takes the lead in having pulled through the key problem in technology that hydriopsis cumingii does sth. in advance breeding at home, originally in greenhouse, artificial culture is carried out to close freshwater mussel and seed thereof, take lower water temperature and biological feed directive breeding technology, impel close freshwater mussel sexual gland ripen in advance and seed to grow fast early spring and succeed.This morning breeding method, March can be posted seedling and be carried out Seedling production, extends the growth cycle 2 months of freshwater mussel then, make hydriopsis cumingii early numerous young freshwater mussel seed output reach 1-2 ten thousand/m
2, the young freshwater mussel physique of breeding out is excellent, neat specification, about 80% can be made to educate jib clam shell then and reach more than 13cm, can meet the requirement that hydriopsis cumingii inserts pearl then completely, shorten and grow cultured pearls half a year to 1 year in cycle, have great economy and social benefit.
Embodiment
The technological means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, setting forth the present invention further below in conjunction with specific embodiment.
Embodiment 1:
The step of this hydriopsis cumingii seed breeding method morning is as follows:
1. close freshwater mussel is selected:
Optimize energetic, shell not damaged, body weight be with in batch freshwater mussel front 10% close freshwater mussel, as alternative close freshwater mussel, and then therefrom select the wide close freshwater mussel being greater than average proportions 15 ~ 20% with the long ratio of shell of shell, as breeding close freshwater mussel, in close freshwater mussel, sex ration is 3: 1; Select the time of close freshwater mussel at the beginning of 11 months, namely just entered the season in winter, select close freshwater mussel on the date that temperature is 5 ~ 15 DEG C.Wherein, the proterties of female freshwater mussel and male freshwater mussel is differentiated to refer to table 1.
The proterties of the female freshwater mussel of table 1 and male freshwater mussel is differentiated
The close freshwater mussel chosen need be transported immediately, avoids violent top quite during transport.Parent freshwater mussel bamboo basket loads and transports, first at the bottom of basket, put one deck pasture and water place mat, then put into close freshwater mussel pendulum neat, allow freshwater mussel delivery port upwards, be close to one by one, and then spread one deck pasture and water up, then lay out freshwater mussel, the multiple one deck of such layer, add a cover sealing can load and transport, after arriving destination, open basket immediately, close freshwater mussel is entered pond and supports temporarily.
2. close freshwater mussel is cultivated:
Adopt green house breeding method, build up close freshwater mussel mid-November and cultivate green house, area 2-3 is advisable in mu/pond, first clear pond, remove hydriopsis cumingii and other freshwater shellfishes of remnants at the bottom of pond, avoid causing kind of matter to pollute, nutrient competition etc., then lime disinfection is adopted, consumption is 60-80kg/ mu, high light-passing plastic cloth and steel structure support thereof is finally adopted to build green house above pond, after green house is put up, pond water filling, as early as possible preferred close freshwater mussel is linked into greenhouse after water filling, otherwise greenhouse internal-external temperature difference becomes large, make close freshwater mussel produce temperature difference stress reaction to damage, every mu of greenhouse only hangs close freshwater mussel 300-400, parent freshwater mussel greenhouse cultivation is after 2 months, ripe hook Jie larva can be cherished to March in the coming year, note making regular check on booth in cultivating process whether damaged, timely cleaning accumulated snow.
3. collect seedling:
Can collect seedling at the beginning of 3 months, picked out by female freshwater mussel of nourishing ripe hook Jie larva, dry in the shade 3h, put into fill fresh pond water post seedling aquarium, the density of hook Jie larva of host symptoms attachment is 3 ~ 40,000/kg host symptoms, and above-mentioned all operations all carries out in greenhouse.
Host symptoms selects individual weight about 50g, and body surface smooth and mucus are enriched, and the anosis healthy yellow cartfish without wound, support temporarily in greenhouse before posting seedling, breeding 1,000,000 young freshwater mussels needs 75kg host symptoms.
1 > parent freshwater mussel produces seedling:
1) the female close freshwater mussel of hook Jie larval maturation is selected:
Select external gill plentiful abundant, color is isabelline, or the female close freshwater mussel that atropurpureus is alternate with lark, penetrates into position, external gill stage casing with pin, then take out hook Jie larva carefully along gill filament direction, can take out of one continuously fine rule be good to the dam freshwater mussel outside shell.
2) hook Jie larval maturity is checked:
Outward appearance: the outer gill lamella is very plentiful, and the gill filament is sturdy, presents orange-yellow or kermesinus.
Byssus: with the dissecting needle pricking method gill lamella, if can take thread hook Jie larva of a tapeworm or the cercaria of a schistosome worm out of, then illustrate that the hook Jie larva of a tapeworm or the cercaria of a schistosome worm in " child-bearing capsule " grows ripe, ripe hook Jie larva of a tapeworm or the cercaria of a schistosome worm byssus prosperity is interweaved together and defines filamentous.
Microscopy: hook Jie larva of taking-up is placed in basis of microscopic observation, if the hook Jie larva in a visual field is whole or large portion rupture of membranes, and two shells can be agitated the sixth of the twelve Earthly Branches slightly, byssus adhesion, then show that hook Jie larva is mostly ripe.
3) seedling is produced:
By the female freshwater mussel wash clean of hook Jie larval maturation chosen, empty 0.5 ~ the 1h of dew in the cool, the length of time adjusts depending on air humidity, lying in footpath, the end is about in the large basin of 50cm, high 20 ~ 25cm, and every basin is put 10 and is advisable, and adds clear water (being no more than 1 DEG C with pond water temperature difference) to the just female freshwater mussel of submergence and is as the criterion, female freshwater mussel discharges into the floccule of bulk, after about 30 ~ 45min has certain density, take out female freshwater mussel, put into another large basin and continue to allow it produce seedling.
2 > collect seedling:
In large basin, stir water body with hand lightly, the floccule containing hook Jie larva is scattered, and put into by host symptoms and produce seedling basin, often only female freshwater mussel puts into host symptoms 0.5 ~ 1kg usually, carries out hydrostatic and collects seedling; Collect seedling time controling at 10 ~ 20min, and density is advisable with 3 ~ 40,000/kg host symptoms, collects seedling period, gives produce oxygenation in seedling basin with a small-sized oxygen increasing pump; The host symptoms having adopted seedling should put into the raising of flowing water nursery pond in time.
4. parasitic stages freshwater mussel seedling is cultivated:
The emphasis that parasitic stages freshwater mussel seedling is cultivated is that host symptoms is raised, and the breeding density of host symptoms is with 1m
2nursery pond is put host symptoms 1 ~ 1.5kg in a suitable place to breed and is advisable.Cistern and larval rearing water are circulated, by the water extraction height temperature of fry nursing pool of cistern in printing opacity green house, the volume ratio of nursery pond and cistern water body is 1: 5, cistern is regularly annotated new water, improvement water quality, environmentally temperature regulates the new water yield of filling, ensures that water temperature reduces and is no more than 2 DEG C.
The flow velocity of larval rearing water is good with 1 ~ 1.5T/h, when every day the morning 8, noon 12 time and afternoon 5 time respectively survey water temperature once, and to average, when accumulative water temperature reaches 180 DEG C, will seedling be taken off, and generally need 7 ~ 16d; Disappear to the small particles on the gill filament and fin ray, accumulative water temperature reaches 200 DEG C, and freshwater mussel seedling has taken off substantially, is pulled out gently by host symptoms in time, proceeds to young freshwater mussel breeding phase.
5. after de-seedling, young freshwater mussel is cultivated:
1 > breeding density: 1m
2put freshwater mussel seedling 2 ~ 30,000 in nursery pond in a suitable place to breed to be advisable;
2 > lower water temperature: young freshwater mussel breeding phase carries out in greenhouse, lower water temperature is cultivated with parasitic stages freshwater mussel seedling;
3 > coutroi velocities: pond water flow velocity in advance the slow later stage fast, flow velocity 0.5 ~ 2T/h, night is greater than daytime;
4 > increase dissolved oxygen: the water-soluble oxygen amount in pond must not lower than 5mg/L;
5 > add nutritive mud: every day adds nutritive mud, the addition high with the shell of young freshwater mussel (0.3mm ~ 1cm) of nutritive mud is consistent, in order to avoid mud is too much and occur the dead angle that mud is piled up, severe quantization adds nutritive mud, once a day;
6 > grasp pond hardening: in order to avoid freshwater mussel seedling is too concentrated and death by suffocation, and adhere to diligent behaviour pond, every day at least 2 times, evacuate freshwater mussel seedling, during behaviour pond, hand is not encountered at the bottom of pond.
6. young freshwater mussel is cultivated:
Enter May, outdoor ponds water temperature rises, adopts raising in cage children freshwater mussel.
1 > water body and net cage sterilization: lime disinfection concentration is 350mg/L, first quicklime is added suitable quantity of water and melt rapidly during use, evenly splashes in full pond, and effective drug duration is 7 ~ 10d;
2 > stocking sizes: the freshwater mussel seedling of the long 0.8cm ~ 1cm of shell;
3 > breeding density: net cage size is 50cm × 50cm × 10cm, put 100 ~ 150 freshwater mussel seedlings in a suitable place to breed with every net cage, and per hectare is put 600,000 in a suitable place to breed and is advisable;
4 > net cage hanging cultures: every case about spacing 4m, keeps hanging on 30cm place under water and be advisable;
5 > add nutritive mud: thickness is 0.8 ~ 1cm, can uprightly for degree with young freshwater mussel;
6 > dutys wash etting: the periphtic algae on etting wants duty to scrub.
More than show and describe general principle of the present invention, principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (1)
1. a hydriopsis cumingii seed early breeding method, is characterized in that, comprise the following steps:
1> close freshwater mussel is selected: select energetic, shell not damaged, body weight is the close freshwater mussel with criticizing in freshwater mussel front 10%, and as alternative close freshwater mussel, and then it is wide long than the close freshwater mussel being greater than average proportions 15 ~ 20% with shell therefrom to select shell, as breeding close freshwater mussel; In parent freshwater mussel, sex ration is 3:1, selects the close freshwater mussel time at the beginning of 11 months, has namely just entered the season in winter, select close freshwater mussel on the date that temperature is 5 ~ 15 DEG C, and wherein, the proterties of female freshwater mussel and male freshwater mussel is differentiated as follows:
Clam shell shape: female freshwater mussel is under equivalent environment, and individuality of the same age is slightly larger than male freshwater mussel, and two shells are more swollen and wider, and trailing edge is comparatively round blunt; Male freshwater mussel is under equivalent environment, and individuality of the same age is slightly less than female, and clam shell is longer and narrower, and rear end is point slightly;
External gill shape: female freshwater mussel gill filament arrangement is tight, gill filament number 100 ~ 120; Male freshwater mussel gill filament arrangement is sparse, gill filament number 60 ~ 80;
Sexual gland color: between female freshwater mussel reproduction period, sexual gland is orange colour, flows out with there being particulate material after acupuncture; Between male freshwater mussel reproduction period, sexual gland is creamy white, and flows out with adularescent slurries after acupuncture;
The close freshwater mussel chosen need be transported immediately, avoids severe jolt during transport; Parent freshwater mussel bamboo basket loads and transports, first at the bottom of basket, put one deck pasture and water place mat, then put into close freshwater mussel pendulum neat, allow freshwater mussel delivery port upwards, be close to one by one, and then spread one deck pasture and water up, then lay out freshwater mussel, the multiple one deck of such layer, add a cover sealing can load and transport, after arriving destination, open basket immediately, close freshwater mussel is entered pond and supports temporarily;
2> parent freshwater mussel is cultivated: adopt green house breeding method, build up close freshwater mussel mid-November and cultivate green house, area 2 ?3 mu/pond, first clear pond, remove hydriopsis cumingii and other freshwater shellfishes of remnants at the bottom of pond, avoid causing kind of matter to pollute, nutrient competition, then lime disinfection is adopted, consumption be 60 ?80kg/ mu, high light-passing plastic cloth and steel structure support thereof is finally adopted to build green house above pond, after green house is put up, pond water filling, as early as possible the close freshwater mussel selected is linked into greenhouse after water filling, otherwise greenhouse internal-external temperature difference becomes large, make close freshwater mussel produce temperature difference stress reaction to damage, every mu of greenhouse hang close freshwater mussel 300 ?400, parent freshwater mussel greenhouse cultivation is after 2 months, ripe hook Jie larva can be cherished to March in the coming year, note making regular check on booth in cultivating process whether damaged, timely cleaning accumulated snow,
3> collects seedling: can collect seedling at the beginning of 3 months, female freshwater mussel of nourishing ripe hook Jie larva is picked out, dry in the shade 3h, put into fill fresh pond water post seedling aquarium, the density domination of hook Jie larva of host symptoms attachment is at 3 ~ 40,000/kg host symptoms, and all operations of collecting seedling in process all carries out in greenhouse;
Host symptoms selects individual weight about 50g, and body surface smooth and mucus are enriched, the anosis healthy yellow cartfish without wound, and support temporarily in greenhouse before posting seedling, breeding 1,000,000 young freshwater mussels needs 75kg host symptoms;
3.1> parent freshwater mussel produces seedling:
3.1.1) the female close freshwater mussel of hook Jie larval maturation is selected:
Select external gill plentiful abundant, color is isabelline, or the female close freshwater mussel that atropurpureus is alternate with lark, penetrates into position, external gill stage casing, then take out hook Jie larva carefully along gill filament direction with pin, can take out of one continuously fine rule to the dam freshwater mussel outside shell;
3.1.2) hook Jie larval maturity is checked:
Outward appearance: the outer gill lamella is very plentiful, and the gill filament is sturdy, presents orange-yellow or kermesinus;
Byssus: with the dissecting needle pricking method gill lamella, if can take thread hook Jie larva of a tapeworm or the cercaria of a schistosome worm out of, then illustrate that the hook Jie larva of a tapeworm or the cercaria of a schistosome worm in " child-bearing capsule " grows ripe, ripe hook Jie larva of a tapeworm or the cercaria of a schistosome worm byssus prosperity is interweaved together and defines filamentous;
Microscopy: hook Jie larva of taking-up is placed in basis of microscopic observation, if the hook Jie larva in a visual field is whole or large portion rupture of membranes, and two shells can be agitated slightly, byssus adhesion, then show that hook Jie larva is mostly ripe;
3.2) seedling is produced:
By the female freshwater mussel wash clean of hook Jie larval maturation chosen, empty 0.5 ~ the 1h of dew in the cool, the length of time adjusts depending on air humidity, lie in footpath, the end to be about in the large basin of 50cm, high 20 ~ 25cm, every basin puts 10, adds the clear water that is no more than 1 DEG C with pond water temperature difference to the just female freshwater mussel of submergence and is as the criterion, female freshwater mussel discharges into the floccule of bulk, after 30 ~ 45min has certain density, take out female freshwater mussel, put into another large basin and continue to allow it produce seedling;
3.3> collects seedling:
In large basin, stir water body with hand lightly, the floccule containing hook Jie larva is scattered, and put into by host symptoms and produce seedling basin, often only female freshwater mussel puts into host symptoms 0.5 ~ 1kg usually, carries out hydrostatic and collects seedling; Collect seedling time controling at 10 ~ 20min, and density, with 3 ~ 40,000/kg host symptoms, is collected seedling period, gives produce oxygenation in seedling basin with a small-sized oxygen increasing pump; The host symptoms having adopted seedling should put into the raising of flowing water nursery pond in time;
4> parasitic stages freshwater mussel seedling is cultivated: the breeding density of host symptoms is with 1m
21 ~ 1.5kg is put in a suitable place to breed in nursery pond, cistern and larval rearing water are circulated, by the water extraction height temperature of fry nursing pool of cistern in printing opacity green house, nursery pond and cistern water body volume are than being 1:5, cistern is regularly annotated new water, improvement water quality, environmentally temperature regulates the new water yield of filling, ensures that water temperature reduces and is no more than 2 DEG C;
The flow velocity of larval rearing water with 1 ~ 1.5T/h, when every day the morning 8, noon 12 time and afternoon 5 time respectively survey water temperature once, and to average, when accumulative water temperature reaches 180 DEG C, will seedling be taken off, and generally need 7 ~ 16d; Disappear to the small particles on the gill filament and fin ray, accumulative water temperature reaches 200 DEG C, and freshwater mussel seedling has taken off substantially, is pulled out gently by host symptoms in time, proceeds to young freshwater mussel breeding phase;
5> is young freshwater mussel cultivation after taking off seedling:
5.1> breeding density: 1m
2freshwater mussel seedling 2 ~ 30,000 is put in a suitable place to breed in nursery pond;
5.2> lower water temperature: young freshwater mussel breeding phase carries out in greenhouse, lower water temperature is cultivated with parasitic stages freshwater mussel seedling;
5.3> coutroi velocity: pond water flow velocity in advance the slow later stage fast, flow velocity 0.5 ~ 2T/h, night is greater than daytime;
5.4> increases dissolved oxygen: the water-soluble oxygen amount in pond must not lower than 5mg/L;
5.5> interpolation nutritive mud: every day adds nutritive mud, the addition of nutritive mud is consistent with the shell height 0.3mm ~ 1cm of young freshwater mussel, and in order to avoid mud is too much and occur the dead angle that mud is piled up, severe quantization adds nutritive mud, once a day;
5.6> behaviour pond hardening: in order to avoid freshwater mussel seedling is too concentrated and death by suffocation, adhere to diligent behaviour pond, every day at least 2 times, evacuate freshwater mussel seedling, during behaviour pond, hand is not encountered at the bottom of pond;
6> children freshwater mussel is cultivated:
Enter May, outdoor ponds water temperature rises, adopts raising in cage children freshwater mussel;
6.1> water body and net cage sterilization: lime disinfection concentration is 350mg/L, first quicklime is added suitable quantity of water and melt rapidly during use, evenly splashes in full pond, and effective drug duration is 7 ~ 10d;
6.2> stocking size: the freshwater mussel seedling of the long 0.8cm ~ 1cm of shell;
6.3> breeding density: net cage size is 50cm × 50cm × 10cm, put 100 ~ 150 freshwater mussel seedlings in a suitable place to breed with every net cage, per hectare puts 600,000 in a suitable place to breed;
6.4> net cage hanging culture: every case about spacing 4m, keeps hanging on 30cm place under water;
6.5> adds nutritive mud: thickness is 0.8 ~ 1cm, can uprightly for degree with young freshwater mussel;
6.6> duty washes etting: the periphtic algae on etting wants duty to scrub.
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