CN101703024B - Method and device for cage propagation of Portunus trituberculatus Miers in coastal mudflat pond - Google Patents

Method and device for cage propagation of Portunus trituberculatus Miers in coastal mudflat pond Download PDF

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Publication number
CN101703024B
CN101703024B CN2009103039750A CN200910303975A CN101703024B CN 101703024 B CN101703024 B CN 101703024B CN 2009103039750 A CN2009103039750 A CN 2009103039750A CN 200910303975 A CN200910303975 A CN 200910303975A CN 101703024 B CN101703024 B CN 101703024B
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crab
cage
net cage
net
hatching
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CN2009103039750A
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CN101703024A (en
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储张杰
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浙江海洋学院
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/80Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
    • Y02A40/81Aquaculture, e.g. of fish

Abstract

The invention provides a method for the cage propagation of Portunus trituberculatus Miers in a coastal mudflat pond, which is characterized in that: selecting and domesticating parent crabs; selecting egg-carrying crabs and producing juveniles; and breeding juvenile crabs, wherein the whole juvenile crab breeding process is performed in natural ecological environment in the coastal mudflat pond. The invention also provides breeding cages and accessory facilities which are used in the method, which comprise temporary parent crab breeding cages, breeding cages and juvenile attaching bases. In the cage propagation in the coastal mudflat ponds of the invention, the parent crabs are gown in the temporary breeding cages, the juveniles are distributed in the breeding cages and the juveniles are bred in the cages; all facilities are arranged in one pond, so the operation is convenient; being bred in the outdoor coastal mudflat pond, the Portunus trituberculatus Mier juveniles can well adapt to the outside environment; the survival rate is high; the juveniles production is consistent; and the drawback of low adaptability to outside environment of juvenile crabs bred in greenhouses is overcome.

Description

The net cage propagation method and the device thereof in the coastal beach of a kind of Portunus trituberculatus Miers pond

Technical field

The present invention relates to the net cage propagation method and the device thereof in the coastal beach of a kind of Portunus trituberculatus Miers pond, belong to aquaculture field.

Background technology

Portunus trituberculatus Miers belongs to Arthropoda, Crustachia, Decapoda, Portumidae, Portunus, is to be distributed widely in the coastal large edible crab class of China.It is traditional famous and precious marine product, because of its fat grossness, meat multi-flavor U.S.A enjoy and like, and can fresh and alively transport, and is very fast-selling at home and abroad, holds at high price.On producing, breed seed soon, then because of its growth and can grow up to commercial specification, and aquaculture management to be relatively easy, better results for culturing economic, and development is very fast in coastal beach pond culture in recent years, becomes the main breed variety of China's economic crab.In recent ten years, along with the continuous increase of the reducing year by year of marine fishing output, domestic and international market demand, swimming crab is propagated maritime provinces such as Liaoning in China, Shandong, Jiangsu, Zhejiang, Fujian, Guangdong, Guangxi artificially and rises rapidly.Since 2000, because the swimming crab cultured area enlarges, demand increases severely, and wild seed can not be satisfied the breed demand, various places are carried out Portunus trituberculatus Miers industrial artificial seedling rearing or seedling rearing in earth ponds one after another, for alleviating in short supply the playing an important role of China swimming crab seed.

Factorial seedling growth is to carry out in indoor cement pit, controls the incubation temperature of swimming crab artificially, the reproductive output height, but the seedling that temperature control brings out adaptive capacity to environment is poor to external world, it is low that seed is cultured in the commodity crab process survival rate; And seedling rearing in earth ponds is good to the adaptability of environment, the survival rate height, but need a large amount of water surface resources, in addition, output is relatively low.Chinese invention patent CN100403885C provides a kind of propagation method of Portunus trituberculatus Miers, but this method is still in cistern and carries out.Therefore the present not outdoor culture facility of Portunus trituberculatus Miers is necessary to design a kind of at outdoor culture facility very much, has both solved the adaptability problem of the young to natural surroundings, simultaneously again can be with the indoor raising of seedling production that equally intensifies.

Summary of the invention

The present invention mainly is the technical problem at existing in prior technology etc., and the net cage propagation method in the coastal beach of a kind of Portunus trituberculatus Miers pond is provided.

Another object of the present invention provides a kind of grow seedlings net cage and affiliated facility that is applicable to that the Portunus trituberculatus Miers outdoor ponds is cultured, solved the problem of the needs that in the larval culture process natural surroundings adapted to, improved its survival rate, accomplish that simultaneously seedling-growing time is concentrated relatively, be convenient to the cultivation of the young.

Above-mentioned technical problem of the present invention is mainly solved by following technical proposals:

A kind of Portunus trituberculatus Miers grow seedlings net cage and affiliated facility is characterized in that: comprise that close crab supports cage, hatching net cage and young adherance temporarily, it is the cage shape cylindrical shell that is made of skeleton and net sheet that close crab is supported cage temporarily, and its top is provided with the bait throwing in mouth, and the bottom is provided with sinker; The hatching net cage comprises net cage support and casing, and the upper and lower opening of net cage body is equipped with the guiding principle rope, is separately fixed at the upper and lower of net cage support, and the hatching net cage is made by the net sheet; Young adherance is netted lamellar structure, and its top is provided with float, and the bottom is provided with net and weighs down; Young adherance is fixed on the inside of hatching net cage.Portunus trituberculatus Miers is positioned over close crab and supports ectogenesis in the cage temporarily, the young that hatches can be distributed in hatching net cage inside, then attached to growing on the young adherance, has realized Portunus trituberculatus Miers the breeding naturally of outdoor net cage, thereby has simplified manual operation.

As preferably, the net cage support is provided with four, is to be made by mao bamboon.Mao bamboon is easily fixing and not perishable in water.

As preferably, it is nontoxic polythene net sheet that close crab is supported cage net sheet, net cage net sheet and young adherance temporarily.The polythene net sheet helps adhering to of juvenile crab and grows.

As preferably, parallel equidistant is arranged between a plurality of young adherances.

As preferably, young adherance is the net sheet of 0.5-0.6m * 3m or 0.5-0.6m * 4m, is after the liquor potassic permanganate of 0.1-0.2g/L soaks 15min, to hang one every 0.5-1.0m in the hatching net cage with concentration.

A kind of net cage propagation method of utilizing said apparatus to carry out the coastal beach of Portunus trituberculatus Miers pond, it is characterized in that: the selection that comprises close crab with raise and train, the selection of ovigerous crab and row children, the juvenile crab hatching process, whole process is carried out in the natural ecological environment in coastal beach pond, specifically may further comprise the steps:

The selection of A, close crab with raise and train

After April, select healthy and strong active, body surface is clean, body colour is normal, limbs are complete, no wound, female crab or the ovigerous crab through post-coitum of whose body weight more than 250g, placing close crab to support in the cage temporarily cultivates, the parent crab is supported dried up the 20-30cm in cage cage top temporarily, keep water cleaning in the pool, the dissolved oxygen abundance, control seawater salinity 22-28 ‰, pH 7.8-8.8; Bait is based on clam worm or the shellfish of living, or fresh and throw something and feed through the flesh of fish of sterilization, and a day feeding volume is the 5%-10% of close crab body weight, is as the criterion to show a small surplus at every turn;

The selection of B, ovigerous crab and row children

When the water temperature of nursery pond rises to 18-20 ℃, with ovum look in the foster temporarily cage of close crab is brown, the black of ash, the microscopy heartbeat reaches the above ovigerous crab of 130 times/min and chooses, sterilize through 30mg/L-50mg/L formalin solution dipping bath, after the flushing with clean water, be reentered into row children in the hatching net cage, the density that ovigerous crab is put into the hatching net cage is every 10m 2Only put ovigerous crab 1-2;

C, juvenile crab hatching

Z 1Phase throw something and feed unit cell algae and wheel animalcule, Z 2Phase-Z 4Throw something and feed wheel animalcule and artemia nauplii of phase, megalops larva and young crab throw something and feed halogen worm adult, the broken end of shellfish shrimpfish meat or egg custard, or swimming crab young special compound feed day are thrown something and fed 3 times-4 times.

As preferably, comprise that also step D, seed go out the pond: crab goes out the pond time at C 2After phase metamorphosis is finished the 2nd day, big hatching net cage breeding evening is with 15-25W electric light photo-induction collection, copies and drags for dragging for extra large net; The breeding of little hatching net cage can be directly copied and is dragged for dragging for extra large net the seedling in the net cage is concentrated.

As preferably, in step C, the juvenile crab hatching,, use 1.0-2.0kg/1000m when water transparence during greater than 40cm 2The soya bean of Chi Shui is starched the rich water of splashing.

As preferably, the regulating and controlling water quality of whole incubation: early stage natural temperature is low, and Chi Shui highly keeps 0.8-1.0m, uses the aerator oxygenation simultaneously, during the pH value remain on 7.8-8.8, salinity 22-28 ‰, dissolved oxygen is more than 4mg/L, ammonia nitrogen is less than 0.4mg/L; When adding during greater than 40cm, water transparency throws that soya-bean milk or rich water are plain to improve fertile degree; To C 1The phase natural temperature rises to 20-25 ℃, adds the full sea water 5-10cm through thorough disinfection every day, at last to C 2Chi Shui highly adds to 1.5m during the phase.Keep the breeding water pure and fresh.

The present invention is provided with the net cage breeding with coastal beach pond, oogenesis parent crab is supported in the cage temporarily and cultivates, cloth seedling in the hatching net cage, the young is cultivated in net cage, and these facilities are all in same pond, easy to operate, simultaneously owing to be to carry out in outdoor coastal beach pond, the swimming crab seed that the brings out adaptability of environment to external world is good, the survival rate height, to emerge neat, overcome juvenile crab that the greenhouse the brings out shortcoming of environmental suitability difference to external world.In addition, the quantity of hatching net cage setting can determine that net cage seedling nursery is very convenient, and it both had been suitable for raiser's small-scale production flexibly according to what, the size of breeding scale of close crab, also being suitable for extensive intensification and producing.

The present invention is provided with the method that net cage is bred swimming crab with coastal beach pond, has both accomplished that reproductive output was higher, owing to be to cultivate in outdoor ponds, has solved the adaptability problem of seed to environment again.The invention solves the key technology in the swimming crab seed production process,, obtain favorable economic benefit and social benefit for the juvenile crab that the raiser provides neat specification, good quality.

Z described in the present invention 1, Z 2, Z 3, Z 4Phase is represented 1 phase of zoea, 2 phases, 3 phases, 4 phases of Portunus trituberculatus Miers, C respectively 1, C 2Phase is represented 1 phase of young crab, 2 phases of Portunus trituberculatus Miers respectively.

Description of drawings

Fig. 1 is a kind of structural representation that net cage is hatched in the present invention;

Fig. 2 is a kind of structural representation that the present invention parent crab is supported cage temporarily.

Label declaration: 1 close crab is supported cage temporarily, 11 bait throwing in mouths, and 12 skeletons, 13 net sheets, 14 sinkers, 15 hoist cables, 2 hatching net cages, 21 net cage supports, 22 guiding principle ropes suitable for reading, 23 end opening guiding principle ropes, 3 young adherances, 31 floats, 32 nets weigh down.

Embodiment

Below by embodiment, and in conjunction with the accompanying drawings, technical scheme of the present invention is described in further detail.

Embodiment

One. breeding environment and facility

1. the selection of site: trend is unimpeded, pollution-free, have a good transport service, electric power abundance, coastal beach pond that stormy waves is little.Seawater quality meets GB GB 11607 regulations, and salinity 22-28 about ‰.

2. nursery pond: pond shape rectangle, area 2000-3000m 2About, depth of water 1.3-1.5m.Smooth and be argillo arenaceous at the bottom of the pond, plastic film is set around the pond.Dig the rainwater curb around the pond and bury anti-harmful animal nethike embrane underground, reaching wave resistance, prevent that rainwater from flowing into and to prevent that harmful animal from entering the effect of hatchery, all working is not water filling and put seedling and finished before January in the pond.

3. grow seedlings net cage and affiliated facility of Portunus trituberculatus Miers comprises that close crab supports cage 1, hatching net cage 2 and young adherance 3 temporarily.

As shown in Figure 2, it is the cage shape cylindrical shell that is made of skeleton 12 and net sheet 13 that close crab is supported cage 1 temporarily, is fixed on by hoist cable 15 on the support in close crab pond.Hoist cable 15 is fixed on the top of supporting cage 1 temporarily by bikini, is fixing usefulness of supporting cage 1 temporarily, and material is nylon rope or No. 8 iron wires of diameter 1-2mm.Supporting cage cage body temporarily is the cylindrical skeleton 12 that is welded into reinforcing bar, high 60-80cm, and diameter 50-60cm is close to skeleton 12 and is equipped with the net sheet 13 that polyethylene is made, and mesh is 9 orders/cm 2, bait throwing in mouth 11 being set above the cage body, can conveniently open and close, the sinker 14 that lead or stone dragon are made is installed on the base of foster cage temporarily.

As shown in Figure 1, hatching net cage 2 is the rectangular box be made up of net cage support 21, guiding principle rope 22 suitable for reading and end opening guiding principle rope 23 that are fixed in the nursery pond.The net cage support 21 that is made by mao bamboon is provided with four, inserts respectively at the bottom of the nursery pond pond.The guiding principle rope 22 suitable for reading of ring-type and end opening guiding principle rope 23 are separately fixed at the upper and lower of net cage support 21, are equipped with net cage net sheet on each face of hatching net cage 2.Guiding principle rope 22 suitable for reading and end opening guiding principle rope 23 can be nylon ropes, also can be iron wires.Net cage net sheet is to make with 30-40 purpose non-toxic polyethylene net sheet, and cage size is 8m * 4m * 1.3m or 4m * 2.5m * 1.3m.Net cage support 21 is stationary structures of making of mao bamboon, and the net cage underwater penetration is 80-90cm, and 0.4-0.5cm surfaces.

The young adherance 3 that is fixed on hatching net cage 2 inside adopts 20-30 purpose non-toxic polyethylene net sheet to make, and is cut into the net sheet of 0.5-0.6m * 3m or 0.5-0.6m * 4m according to the width of hatching net cage 2.Hang one every 0.5-1.0m in net cage, its lower edge is provided with net and weighs down 32, and the upper edge is provided with float 31, with thin wire young adherance 3 is fixed in the hatching net cage 2.Soak about 15min as the 0.1-0.2g/L liquor potassic permanganate with concentration before using.Young adherance is evenly distributed the young, reduces the young permanent disability of juvenile crab, improves its survival rate.

4. culvert system: advance draining separately, the long 6.0m of water inlet mesh bag, 80 order tulles.The long 6m of draining mesh bag, 60-80 mesh sieve thin,tough silk keeps the sealing of full pond, no leak and infiltration.

5. allocation of facility: every 1000-2000m 2The water surface is joined the waterwheel aerator of 1 1.1kw, to guarantee the dissolved oxygen abundance.

Two. the selection of close crab with raise and train

1. select

After April, select healthy and strong active, body surface is clean, body colour is normal, limbs are complete, no wound, the East Sea natural waters of whose body weight more than 250g are caught, through the female crab or the ovigerous crab of post-coitum.Ovigerous crab requires pieces of an egg complete solid, and the ovum look is faint yellow or bisque individuality, does not select the close crab that embraces the black eyed eggs.

Adopt running water or oxygenation transportation.To prevent to run foul of each other and cause injury with rubber band with the bondage of close crab huge legendary turtle foot during transportation.Closely available wet straw bag or gunnysack parcel, fortune is done in watering, should put into mesh bag at a distance, band water inflation transportation.Shorten haulage time as far as possible, avoid the acute variation of dried for a long time dew and salinity, water temperature.

2. close crab is supported cage temporarily and cultivates oogenesis parent crab

Ovigerous crab adopts in the close crab pond method of raising in cages to cultivate, and close crab is supported cage diameter 50-60cm temporarily, the cage top is a dried up 20-30cm.After ovigerous crab is transported to, clean back peeling muscle and go into cage, 2 in every cage keeps water cleaning in the pool, the dissolved oxygen abundance.Seawater salinity 22-28 ‰, pH 7.8-8.8.

Bait is based on clam worm or the shellfish of living, and is necessary fresh if based on the flesh of fish, and sterilization back stripping and slicing is thrown something and fed, and a day feeding volume is the 5%-10% of close crab body weight, is as the criterion to show a small surplus at every turn.Change water once in per 35 days, and removed residual bait and dead close crab.

Three, the selection of ovigerous crab and row children

When the water temperature of nursery pond rises to 18-20 ℃, observe cage in-laws crab embryonic development situation when throw something and feed every day, the change color of ovum is in proper order: light yellow-orange-yellow-light gray-taupe-black.With ovum look in the cage of close crab pond is brown, the black of ash, and the microscopy heartbeat reaches the above ovigerous crab of 130 times/min to be chosen, and through 30mg/L-50mg/L formalin dipping bath 10min sterilization, after the flushing with clean water, is reentered into row children in the hatching net cage, grows bad ovigerous crab and rejects.The density that ovigerous crab is put into the hatching net cage is every 10m 2Only put ovigerous crab 1-2, water temperature 18-27 ℃, the fate of breeding young crab was generally 20-30 days.For making young growth synchronously, seedling culture all shifted out net cage with ovigerous crab after 3 days.

Four, juvenile crab hatching

Z 1Phase throw something and feed unit cell algae and wheel animalcule, Z 2Phase-Z 4Throw something and feed wheel animalcule and artemia nauplii of phase, megalops larva and young crab throw something and feed halogen worm adult, the broken end of shellfish shrimpfish meat or egg custard etc., the swimming crab young special compound feed of also can throwing something and feeding day is thrown something and fed 3 times-4 times.

Because of being initial feeding soon behind the young membrane, open-mouthed bait is based on unit cell algae and wheel animalcule, and close crab goes into to hatch net cage and promptly throws free wheel worm 5-10g/m 2, to Z 1After date, free wheel worm 3-5g/m throws something and feeds every day 2, Z 2Phase increases to 5-8g/m 2, Z 3, Z 4Phase increases to 10-20g/m 2Water transparence is used 1.0-2.0kg/1000m during greater than 40cm 2The soya bean of Chi Shui is starched the rich water of splashing.To C 1No longer throw something and feed wheel animalcule during the phase and add fresh halogen worm of throwing or the special-purpose bait of the swimming crab young, add every day and throw halogen worm or the special-purpose bait 20-30g/m of the swimming crab young 2, C 2Add every day phase and throw the rotten 20-30g/m of ripe fish 2Or the special-purpose bait 20-30g/m of the swimming crab young 2Simultaneously, decide the increase and decrease of daily ration, feeding quantity according to the food situation of the young every day.

Five, regulating and controlling water quality and disease control

Early stage natural temperature is low, and pond water height dimension is held in 0.8-1.0m, in order to temperature raising, rationally utilizes aerator improving water quality simultaneously, during the pH value remain on 7.8-8.8, salinity 22-28 ‰, dissolved oxygen is more than 4mg/L, ammonia nitrogen is less than 0.4mg/L., then add and throw soya-bean milk and the fertile degree of the plain raising of rich water greater than 40cm as water transparency.To C 1During the phase, natural temperature has risen 20-25 ℃, adds the full sea water 5-10cm through thorough disinfection every day, at last to C 2Chi Shui highly adds to 1.5m during the phase.

Disease is mainly prevented from the following aspects: the bait thorough disinfection; Used water body thorough disinfection; Sterilized once with quicklime, BCDMH, bleaching powder in per 10 days.

The control of harmful organisms comprises: block around the water that need not thoroughly not handle, pond and film are not broken not to be leaked, and advances the discharge outlet mesh bag and remains intact, in case harmful animal enters.

Six, seed goes out the pond

Crab goes out the pond time at C 2After phase metamorphosis is finished the 2nd day, large cage breeding evening is with 15-25W electric light photo-induction collection, copies and drags for dragging for extra large net; Small-sized net cage breeding can be directly copied and is dragged for dragging for extra large net the seedling in the net cage is concentrated.The seed that catches out can be sold, and also can directly cultivate young crab in nursery pond.

Should be understood that this embodiment only to be used to the present invention is described and be not used in and limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.

Claims (10)

1. Portunus trituberculatus Miers net cage of growing seedlings is characterized in that: comprise that close crab supports cage, hatching net cage and young adherance temporarily, it is the cage shape cylindrical shell that is made of skeleton and net sheet that close crab is supported cage temporarily, and its top is provided with the bait throwing in mouth, and the bottom is provided with sinker; The hatching net cage comprises net cage support and casing, and the upper and lower opening of net cage body is equipped with the guiding principle rope, is separately fixed at the upper and lower of net cage support, and the hatching net cage is made by the net sheet; Young adherance is netted lamellar structure, and its top is provided with float, and the bottom is provided with net and weighs down; Young adherance is fixed on the inside of hatching net cage.
2. the Portunus trituberculatus Miers according to claim 1 net cage of growing seedlings, it is characterized in that: the net cage support is provided with four, is to be made by mao bamboon.
3. the Portunus trituberculatus Miers according to claim 1 and 2 net cage of growing seedlings is characterized in that: it is the polythene net sheet that close crab is supported cage net sheet, net cage net sheet and young adherance temporarily.
4. the Portunus trituberculatus Miers according to claim 1 and 2 net cage of growing seedlings is characterized in that: parallel equidistant is arranged between the young adherance.
5. the Portunus trituberculatus Miers according to claim 1 and 2 net cage of growing seedlings, it is characterized in that: young adherance is the net sheet of 0.5-0.6 m * 3m or 0. 5-0., 6 m * 4 m, with concentration is after the liquor potassic permanganate of 0.1-0.2g/L soaks 15 min, hangs one every 0.5-1.0 m in the hatching net cage.
6. the Portunus trituberculatus Miers according to claim 3 net cage of growing seedlings, it is characterized in that: young adherance is the net sheet of 0.5-0.6 m * 3m or 0. 5-0., 6 m * 4 m, with concentration is after the liquor potassic permanganate of 0.1-0.2g/L soaks 15 min, hangs one every 0.5-1.0 m in the hatching net cage.
7. net cage propagation method of utilizing the described device of claim 1 to carry out the coastal beach of Portunus trituberculatus Miers pond, it is characterized in that: the selection that comprises close crab with raise and train, the selection of ovigerous crab and row children, the juvenile crab hatching process, whole process is carried out in the natural ecological environment in coastal beach pond, specifically may further comprise the steps:
The selection of A, close crab with raise and train
After April, select healthy and strong active, body surface is clean, body colour is normal, limbs are complete, no wound, female crab or the ovigerous crab through post-coitum of whose body weight more than 250g, placing close crab to support in the cage temporarily cultivates, the parent crab is supported dried up the 20-30cm in cage cage top temporarily, keep water cleaning in the pool, the dissolved oxygen abundance, control seawater salinity 22-28 ‰, pH 7.8-8.8; Bait is based on clam worm or the shellfish of living, or fresh and throw something and feed through the flesh of fish of sterilization, and a day feeding volume is the 5%-10 % of close crab body weight, is as the criterion to show a small surplus at every turn;
The selection of B, ovigerous crab and row children
When the water temperature of nursery pond rises to 18-20 ℃, with ovum look in the foster temporarily cage of close crab is brown, the black of ash, the microscopy heartbeat reaches the above ovigerous crab of 130 times/min and chooses, sterilize through 30mg/L-50mg/L formalin solution dipping bath, after the flushing with clean water, relay to the hatching net cage and arrange the children, grow bad ovigerous crab and reject, the density that ovigerous crab is put into the hatching net cage is that per 10 ㎡ are only put ovigerous crab 1-2, water temperature 18-27 ℃;
C, juvenile crab hatching
Z 1Phase throw something and feed unit cell algae and wheel animalcule, Z 2Phase-Z 4Throw something and feed wheel animalcule and artemia nauplii of phase, megalops larva and young crab throw something and feed halogen worm adult, the broken end of shellfish shrimpfish meat or egg custard, or swimming crab young special compound feed day are thrown something and fed 3 times-4 times.
8. propagation method according to claim 7, it is characterized in that also comprising that step D, seed go out the pond: crab goes out the pond time at C 2After phase metamorphosis is finished the 2nd day, big hatching net cage breeding evening is with 15-25 W electric light photo-induction collection, copies and drags for dragging for extra large net; The breeding of little hatching net cage can be directly copied and is dragged for dragging for extra large net the seedling in the net cage is concentrated.
9. according to claim 7 or 8 described propagation methods, it is characterized in that: in the hatching of step C, juvenile crab,, starch the rich water of splashing with the soya bean of 1.0-2.0 kg/1000 ㎡ Chi Shui when water transparence during greater than 40cm.
10. according to claim 7 or 8 described propagation methods, it is characterized in that: early stage natural temperature is low, and Chi Shui highly keeps 0.8-1.0m, use the aerator oxygenation simultaneously, during the pH value remain on 7. 8-8.8, salinity 22-28 ‰, dissolved oxygen is more than 4 mg/L, and ammonia nitrogen is less than 0.4mg/L; When adding during greater than 40 cm, water transparency throws that soya-bean milk or rich water are plain to improve fertile degree; To C 1The phase natural temperature rises to 20-25 ℃, adds the cm through the full sea water 5-10 of thorough disinfection every day, at last to C 2Chi Shui highly adds to 1.5 m during the phase.
CN2009103039750A 2009-07-03 2009-07-03 Method and device for cage propagation of Portunus trituberculatus Miers in coastal mudflat pond CN101703024B (en)

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