CN103283652B - Efficient ecological breeding method of giant freshwater prawns - Google Patents

Efficient ecological breeding method of giant freshwater prawns Download PDF

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Publication number
CN103283652B
CN103283652B CN201310209198.XA CN201310209198A CN103283652B CN 103283652 B CN103283652 B CN 103283652B CN 201310209198 A CN201310209198 A CN 201310209198A CN 103283652 B CN103283652 B CN 103283652B
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pond
water
shrimp
place
seedling
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CN103283652A (en
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柯明坤
张凤堂
瞿学云
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DONGTAI WANGTONG AGRICULTURE DEVELOPMENT Co Ltd
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DONGTAI WANGTONG AGRICULTURE DEVELOPMENT Co Ltd
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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 discloses an efficient ecological breeding method of giant freshwater prawns. The efficient ecological breeding method includes steps of juvenile prawn breeding, preparation before breeding outside, control of various factors in a pond, outside breeding of shrimps, feeding, nourishing, water quality adjustment and fishing and the like. The shrimps are bred in a greenhouse and put into the pond when growing to juvenile prawns 4-6 in length, so that survival rate is high, breeding period is prolonged, giant prawns are large, yield is high, and breeding efficiency is high.

Description

Macrobrachium rosenbergii high-efficient ecological cultivation method
Technical field
The present invention relates to a kind of Macrobrachium rosenbergii cultural method.
Background technology
Traditional Macrobrachium rosenbergii cultural method directly puts seedling to enter the cultivation of the large pool when water temperature reaches more than 20 DEG C, and survival rate is low, and the culture-cycle is short, becomes shrimp specification less than normal, yields poorly, deficiency in economic performance.
Summary of the invention
The object of the present invention is to provide a kind of survival rate high, easy to operate Macrobrachium rosenbergii high-efficient ecological cultivation method.
Technical solution of the present invention is:
A kind of Macrobrachium rosenbergii high-efficient ecological cultivation method, is characterized in that: comprise the following steps:
(1) juvenile shrimp cultivation
First prawn seedling carries out juvenile prawn intermediate rearing:
1. cultivate pond: in culturing pool, dig a rectangle Tu Chi, area is the 5%-8% of the culturing pool gross area, and width is no more than 8 meters, the degree of depth at 1.2-1.3 rice, above covered with plastic film;
2. cultivate the cleaning sterilization in pond: put Gan Chishui, remove wild mixing, make thorough Loss-on-drying at the bottom of pond shine 1-2 week, to reach the object eliminating harmful animal and sterilization; Disinfecting drug: 10 grams, every square metre, bleaching powder or quicklime every square metre 50 grams, be watered full pool spilling head; 3-4 days plantation pasture and water at the bottom of cultivation pond, pond after sterilization, after one week, seedling is put in water inlet, makees rectangularity mesh bag filter during water inlet with 80 mesh sieve thin,tough silk;
3. breeding density: after sterilizing and remove wild mixing in cultivation pond, after examination water confirms avirulence, put in a suitable place to breed; 5000-10000 tail is put according to warm canopy condition every square metre;
4. feeding and management:
Young shrimp is put into front 4-5 days and uses bio-fertilizer 1-1.5kg/ mu, cultivates water quality; Juvenile prawn puts into rear 2-3 days, the artificial hard pellet diet of the particle diameter 0.12-0.18mm that starts to throw something and feed, and companion feeds the small fish and yolk that boil, to put after seedling yolk and small fish 40 object bolting silks in 10 days, uses 20 order silk cover filterings after 10 days; Change the water body of 1/5th every day, irregularly use biologic product and purification of water quality preparation regulating water quality, uninterrupted oxygenation, improve water body dissolved oxygen amount, reduce the ammonia-nitrogen content in water body; Within every 5-10 days, change once with at the bottom of zeolite powder physics; Control water temperature stability at 27-29 DEG C; Shrimp is proceeded to into pool cultivated during the long 4-6 centimetre of juvenile prawn body;
(2) pond becomes shrimp aquaculture
(1) front preparation is put in a suitable place to breed
Finishing pond: put Gan Chishui, finishing pond, repeatedly enter draining and embathe for several times; Remove harmful animal by one of following method: 1. bleaching powder is cleaned up the pond, band water 10-20 centimetre, with the pond water concentration full pool spilling head of 30-50mg/kg; 2. quicklime is cleaned up the pond, usage: band 20 centimetres, water, and every mu with quicklime 75-150 kilogram; 3. derris extract is cleaned up the pond: usage: band water every mu of consumption of cleaning up the pond is 1.5 kilograms, and dry method every mu consumption is 200 grams, is watered full pond and sprays;
Water filling:
The shutoff of discharge outlet, makes shelf gear before emptying gate with screen cloth, screen cloth 30 object bolting silks, and tests its fastness with hand, confirms that its nothing can after leaking shrimp and drainage;
The filtration of water inlet: the microscler wing making 5-8 rice with 60 object bolting silks is enclosed within water inlet, stops floating grass, foreign material, small fish shrimp and various ovum;
Fertilising: use bio-fertilizer, consumption is 1-2kg/ mu; Also spraying fertilizer, topdress and adopt amino acid rich water element, consumption is at 0.5-1kg/ mu;
(2) control of each factor in pond:
Water temperature: water temperature controls at 25-32 DEG C; Dissolved oxygen: the dissolved oxygen in culturing pool is not less than 4 mg/litre; Acid-base value: the pH value of culturing pool is advisable with 7.5-8.5; Use calcium dihydrogen phosphate, the consumption of calcium dihydrogen phosphate: 1-1.5kg/ mu; Transparency: in the shrimp pool, transparency maintenance 25-40 centimetre is advisable;
(3) shrimp seedling is put in a suitable place to breed
The density that shrimp seedling is put in a suitable place to breed
Cultivation main body: based on monoculture Macrobrachium rosenbergii, collocation flower, silver carp fingerling, wherein variegated carp 50-80 tail/mu, silver carp 200-300 tail/mu;
Stocking size and stocking rate: put the young shrimp of large gauge through excess temperature canopy intermediate rearing, the long 4-6 of body centimetre in a suitable place to breed, mu puts 70,000 tails;
Juvenile prawn examination is put: net cage examination is put; A small amount of shrimp seedling to be placed in net cage one day, and zero accident situation more full pond is put in a suitable place to breed; As put in juvenile prawn process in examination or after shrimp seedling puts in a suitable place to breed, to find in shrimp pond wild fishes and fry more time adopt derris extract to be killed, consumption is 0.5mg/kg;
(4) throwing is raised and applies fertilizer
Seedling stage dietary protein level 40-42%, fat content 6-8%; Dietary protein level 38-40%, fat content 7-10% after the long 6cm of body;
Throw feeding method
Place is raised in throwing: the cultivation initial stage raises in the 0.3 meter of throwing of the surrounding depth of water, along with constantly growing up of shrimp body, progressively throw to deep water place and raise, but the depth of water can not more than 0.7 meter; Feed can not be thrown in ditch Ju, in order to avoid pollute the habitat of shrimp; Throw to raise simultaneously and want evenly, to ingest in order to shrimp;
The time is raised in throwing: just put in a suitable place to breed in one week, as in water body, plankton is many, can not throw something and feed; After putting seven days in a suitable place to breed, throw something and feed every day 3 ~ 4 times;
Carrying out observation work: to ingest situation to grasp Macrobrachium rosenbergii, in pond, establishing a few place to expect platform, throw in feed, observe the surplus and deficiency situation of Macrobrachium rosenbergii to the hobby of feed and feed, be beneficial to the adjustment throwing amount of raising and forage protein content;
Raise feed in latter 2 hours as thrown to be eaten up by shrimp very soon, next time just should increase daily ration, feeding quantity; Otherwise material platform being raised as having a surplus, illustrating that throwing is raised too much, next time just should reduce or suspend throwing and raise; The throwing amount of raising that usual what is called is suitable is that after requirement throwing is raised, feed was eaten up at 2-3 hour;
Fertilising:
As long as the pond of usual cultivation Macrobrachium rosenbergii basal dressing before shrimp seedling is put in a suitable place to breed, in breeding process, normal throwing is raised, and water transparence just can keep 30 centimetres, so also does not just need to impose base manure again; But in cultivation practice, also there are some ponds due to Aquatic Higher Plants amount reproduction, cause pond water quality to reduce, also answer spraying fertilizer; Topdress and adopt inorganic fertilizer amino acid rich water element, the quantity of fertilising and number of times with on a small quantity, repeatedly for principle; Concrete grasp decides according to water colour, and after fertilising, transparency is advisable to reach 30 centimetres, and Chi Shui is good with yellow green or breen;
(5) regulating water quality method
1. the decomposition of bed mud organic matter: is utilize idle periods, cuts out too much pond sludge, by dig out pond sludge in order to reinforce trimming pond bank; Two is drain Chi Shui thorough Loss-on-drying at the bottom of the pool to be shone and freezing, and by the permeability of Exposure to Sunlight and freezing increase pond sludge, the reduction material oxidation Decomposition in promotion pond sludge becomes simple mineral salt;
2. spraying fertilizer is answered when water quality transparency is more than 50 centimetres;
3. improve aerator availability: every 4-5 mu configures an aerator, fine day is opened noon, evening rainy day opened, sultry sky is opened in advance the cloudy day, occur raising the nose above water to breathe to open continuously;
(6) fish for
When high-density breeding requires that part shrimp specification reaches every kilogram of 120 tail, catch and stay greatly little, fished for once every 13-16 days, small dimension shrimp continues to put the pool and raises.
During juvenile prawn intermediate rearing, shrimp seedling body length is during 0.7-2cm: its feedstuff feeding amount by shrimp seedling body weight 200% progressively reduce to 10% of shrimp seedling body weight; During long more than the 2cm of shrimp seedling body: feedstuff feeding amount progressively reduces to 5% of shrimp seedling body weight by 10% of shrimp seedling body weight.
Shrimp seedling children's phase of the present invention, when juvenile prawn body reaches 4-6cm, proceed to the cultivation of the large pool, survival rate was high, extends the culture-cycle at rearing technology, and become shrimp specification large, output is high, and culture benefit is high.
The culture-effect comparison of this patent cultural method and conventional cultivation method
Below in conjunction with embodiment, the invention will be further described.
Embodiment
A kind of Macrobrachium rosenbergii high-efficient ecological cultivation method, is characterized in that: comprise the following steps:
(1) juvenile shrimp cultivation
First prawn seedling carries out juvenile prawn intermediate rearing:
1. cultivate pond: in culturing pool, dig a rectangle Tu Chi, area is the 5%-8% of the culturing pool gross area, and width is no more than 8 meters, the degree of depth at 1.2-1.3 rice, above covered with plastic film;
2. cultivate the cleaning sterilization in pond: put Gan Chishui, remove wild mixing, make thorough Loss-on-drying at the bottom of pond shine 1-2 week, to reach the object eliminating harmful animal and sterilization; Disinfecting drug: 10 grams, every square metre, bleaching powder or quicklime every square metre 50 grams, be watered full pool spilling head; 3-4 days plantation pasture and water at the bottom of cultivation pond, pond after sterilization, after one week, seedling is put in water inlet, makees rectangularity mesh bag filter during water inlet with 80 mesh sieve thin,tough silk;
3. breeding density: after sterilizing and remove wild mixing in cultivation pond, after examination water confirms avirulence, put in a suitable place to breed; 5000-10000 tail is put according to warm canopy condition every square metre;
4. feeding and management:
Young shrimp is put into front 4-5 days and uses bio-fertilizer 1-1.5kg/ mu, cultivates water quality; Juvenile prawn puts into rear 2-3 days, the artificial hard pellet diet of the particle diameter 0.12-0.18mm that starts to throw something and feed, and companion feeds the small fish and yolk that boil, to put after seedling yolk and small fish 40 object bolting silks in 10 days, uses 20 order silk cover filterings after 10 days; Change the water body of 1/5th every day, irregularly use biologic product and purification of water quality preparation regulating water quality, uninterrupted oxygenation, improve water body dissolved oxygen amount, reduce the ammonia-nitrogen content in water body; Within every 5-10 days, change once with at the bottom of zeolite powder physics; Control water temperature stability at 27-29 DEG C; Shrimp is proceeded to into pool cultivated during the long 4-6 centimetre of juvenile prawn body;
(2) pond becomes shrimp aquaculture
(1) front preparation is put in a suitable place to breed
Finishing pond: put Gan Chishui, finishing pond, repeatedly enter draining and embathe for several times; Remove harmful animal by one of following method: 1. bleaching powder is cleaned up the pond, band water 10-20 centimetre, with the pond water concentration full pool spilling head of 30-50mg/kg; 2. quicklime is cleaned up the pond, usage: band 20 centimetres, water, and every mu with quicklime 75-150 kilogram; 3. derris extract is cleaned up the pond: usage: band water every mu of consumption of cleaning up the pond is 1.5 kilograms, and dry method every mu consumption is 200 grams, is watered full pond and sprays;
Water filling:
The shutoff of discharge outlet, makes shelf gear before emptying gate with screen cloth, screen cloth 30 object bolting silks, and tests its fastness with hand, confirms that its nothing can after leaking shrimp and drainage;
The filtration of water inlet: the microscler wing making 5-8 rice with 60 object bolting silks is enclosed within water inlet, stops floating grass, foreign material, small fish shrimp and various ovum;
Fertilising: use bio-fertilizer, consumption is 1-2kg/ mu; Also spraying fertilizer, topdress and adopt amino acid rich water element, consumption is at 0.5-1kg/ mu;
(2) control of each factor in pond:
Water temperature: water temperature controls at 25-32 DEG C; Dissolved oxygen: the dissolved oxygen in culturing pool is not less than 4 mg/litre; Acid-base value: the pH value of culturing pool is advisable with 7.5-8.5; Use calcium dihydrogen phosphate, the consumption of calcium dihydrogen phosphate: 1-1.5kg/ mu; Transparency: in the shrimp pool, transparency maintenance 25-40 centimetre is advisable;
(3) shrimp seedling is put in a suitable place to breed
The density that shrimp seedling is put in a suitable place to breed
Cultivation main body: based on monoculture Macrobrachium rosenbergii, collocation flower, silver carp fingerling, wherein variegated carp 50-80 tail/mu, silver carp 200-300 tail/mu;
Stocking size and stocking rate: put the young shrimp of large gauge through excess temperature canopy intermediate rearing, the long 4-6 of body centimetre in a suitable place to breed, mu puts 70,000 tails;
Juvenile prawn examination is put: net cage examination is put; A small amount of shrimp seedling to be placed in net cage one day, and zero accident situation more full pond is put in a suitable place to breed; As put in juvenile prawn process in examination or after shrimp seedling puts in a suitable place to breed, to find in shrimp pond wild fishes and fry more time adopt derris extract to be killed, consumption is 0.5mg/kg;
(4) throwing is raised and applies fertilizer
Seedling stage dietary protein level 40-42%, fat content 6-8%; Dietary protein level 38-40%, fat content 7-10% after the long 6cm of body;
Throw feeding method
Place is raised in throwing: the cultivation initial stage raises in the 0.3 meter of throwing of the surrounding depth of water, along with constantly growing up of shrimp body, progressively throw to deep water place and raise, but the depth of water can not more than 0.7 meter; Feed can not be thrown in ditch Ju, in order to avoid pollute the habitat of shrimp; Throw to raise simultaneously and want evenly, to ingest in order to shrimp;
The time is raised in throwing: just put in a suitable place to breed in one week, as in water body, plankton is many, can not throw something and feed; After putting seven days in a suitable place to breed, throw something and feed every day 3 ~ 4 times;
Carrying out observation work: to ingest situation to grasp Macrobrachium rosenbergii, in pond, establishing a few place to expect platform, throw in feed, observe the surplus and deficiency situation of Macrobrachium rosenbergii to the hobby of feed and feed, be beneficial to the adjustment throwing amount of raising and forage protein content;
Raise feed in latter 2 hours as thrown to be eaten up by shrimp very soon, next time just should increase daily ration, feeding quantity; Otherwise material platform being raised as having a surplus, illustrating that throwing is raised too much, next time just should reduce or suspend throwing and raise; The throwing amount of raising that usual what is called is suitable is that after requirement throwing is raised, feed was eaten up at 2-3 hour;
Fertilising:
As long as the pond of usual cultivation Macrobrachium rosenbergii basal dressing before shrimp seedling is put in a suitable place to breed, in breeding process, normal throwing is raised, and water transparence just can keep 30 centimetres, so also does not just need to impose base manure again; But in cultivation practice, also there are some ponds due to Aquatic Higher Plants amount reproduction, cause pond water quality to reduce, also answer spraying fertilizer; Topdress and adopt inorganic fertilizer amino acid rich water element, the quantity of fertilising and number of times with on a small quantity, repeatedly for principle; Concrete grasp decides according to water colour, and after fertilising, transparency is advisable to reach 30 centimetres, and Chi Shui is good with yellow green or breen;
(5) regulating water quality method
1. the decomposition of bed mud organic matter: is utilize idle periods, cuts out too much pond sludge, by dig out pond sludge in order to reinforce trimming pond bank; Two is drain Chi Shui thorough Loss-on-drying at the bottom of the pool to be shone and freezing, and by the permeability of Exposure to Sunlight and freezing increase pond sludge, the reduction material oxidation Decomposition in promotion pond sludge becomes simple mineral salt;
2. spraying fertilizer is answered when water quality transparency is more than 50 centimetres;
3. improve aerator availability: every 4-5 mu configures an aerator, fine day is opened noon, evening rainy day opened, sultry sky is opened in advance the cloudy day, occur raising the nose above water to breathe to open continuously;
(6) fish for
When high-density breeding requires that part shrimp specification reaches every kilogram of 120 tail, catch and stay greatly little, fished for once every 13-16 days, small dimension shrimp continues to put the pool and raises.
During juvenile prawn intermediate rearing, shrimp seedling body length is during 0.7-2cm: its feedstuff feeding amount by shrimp seedling body weight 200% progressively reduce to the 10%(body of shrimp seedling body weight long 0.7-1cm time, feeding volume is the 200%-100% of shrimp seedling body weight; During the long 1-1.5cm of body, feeding volume is the 100%-50% of shrimp seedling body weight; During the long 1.5-2cm of body, feeding volume is the 50%-10% of shrimp seedling body weight; ); During long more than the 2cm of shrimp seedling body: when feedstuff feeding amount progressively reduces to the long 2cm-4cm of the 5%(shrimp seedling body of shrimp seedling body weight by 10% of shrimp seedling body weight, feedstuff feeding amount is by the 10%-7% of shrimp seedling body weight; During long more than the 4cm of shrimp seedling body, feedstuff feeding amount is the 7%-5% of shrimp seedling body weight).

Claims (1)

1. a Macrobrachium rosenbergii high-efficient ecological cultivation method, is characterized in that: comprise the following steps:
(1) juvenile shrimp cultivation
First prawn seedling carries out juvenile prawn intermediate rearing:
1. cultivate pond: in culturing pool, dig a rectangle Tu Chi, area is the 5%-8% of the culturing pool gross area, and width is no more than 8 meters, the degree of depth at 1.2-1.3 rice, above covered with plastic film;
2. cultivate the cleaning sterilization in pond: put Gan Chishui, remove wild mixing, make thorough Loss-on-drying at the bottom of pond shine 1-2 week, to reach the object eliminating harmful animal and sterilization; Disinfecting drug: 10 grams, every square metre, bleaching powder or quicklime every square metre 50 grams, be watered full pool spilling head; 3-4 days plantation pasture and water at the bottom of cultivation pond, pond after sterilization, after one week, seedling is put in water inlet, makees rectangularity mesh bag filter during water inlet with 80 mesh sieve thin,tough silk;
3. breeding density: after sterilizing and remove wild mixing in cultivation pond, after examination water confirms avirulence, put in a suitable place to breed; 5000-10000 tail is put according to warm canopy condition every square metre;
4. feeding and management:
Young shrimp is put into front 4-5 days and uses bio-fertilizer 1-1.5kg/ mu, cultivates water quality; Juvenile prawn puts into rear 2-3 days, the artificial hard pellet diet of the particle diameter 0.12-0.18mm that starts to throw something and feed, and companion feeds the small fish and yolk that boil, to put after seedling yolk and small fish 40 object bolting silks in 10 days, uses 20 order silk cover filterings after 10 days; Change the water body of 1/5th every day, irregularly use biologic product and purification of water quality preparation regulating water quality, uninterrupted oxygenation, improve water body dissolved oxygen amount, reduce the ammonia-nitrogen content in water body; Within every 5-10 days, change once with at the bottom of zeolite powder physics; Control water temperature stability at 27-29 DEG C; Shrimp is proceeded to into pool cultivated during the long 4-6 centimetre of juvenile prawn body;
(2) pond becomes shrimp aquaculture
(1) front preparation is put in a suitable place to breed
Finishing pond: put Gan Chishui, finishing pond, repeatedly enter draining and embathe for several times; Remove harmful animal by one of following method: 1. bleaching powder is cleaned up the pond, band water 10-20 centimetre, with the pond water concentration full pool spilling head of 30-50mg/kg; 2. quicklime is cleaned up the pond, usage: band 20 centimetres, water, and every mu with quicklime 75-150 kilogram; 3. derris extract is cleaned up the pond: usage: band water every mu of consumption of cleaning up the pond is 1.5 kilograms, and dry method every mu consumption is 200 grams, is watered full pond and sprays;
Water filling:
The shutoff of discharge outlet, makes shelf gear before emptying gate with screen cloth, screen cloth 30 object bolting silks, and tests its fastness with hand, confirms that its nothing can after leaking shrimp and drainage;
The filtration of water inlet: the microscler wing making 5-8 rice with 60 object bolting silks is enclosed within water inlet, stops floating grass, foreign material, small fish shrimp and various ovum;
Fertilising: use bio-fertilizer, consumption is 1-2kg/ mu; Also spraying fertilizer, topdress and adopt amino acid rich water element, consumption is at 0.5-1kg/ mu;
(2) control of each factor in pond:
Water temperature: water temperature controls at 25-32 DEG C; Dissolved oxygen: the dissolved oxygen in culturing pool is not less than 4 mg/litre; Acid-base value: the pH value of culturing pool is advisable with 7.5-8.5; Use calcium dihydrogen phosphate, the consumption of calcium dihydrogen phosphate: 1-1.5kg/ mu; Transparency: in the shrimp pool, transparency maintenance 25-40 centimetre is advisable;
(3) shrimp seedling is put in a suitable place to breed
The density that shrimp seedling is put in a suitable place to breed
Cultivation main body: based on monoculture Macrobrachium rosenbergii, collocation flower, silver carp fingerling, wherein variegated carp 50-80 tail/mu, silver carp 200-300 tail/mu;
Stocking size and stocking rate: put the young shrimp of large gauge through excess temperature canopy intermediate rearing, the long 4-6 of body centimetre in a suitable place to breed, mu puts 70,000 tails;
Juvenile prawn examination is put: net cage examination is put; A small amount of shrimp seedling to be placed in net cage one day, and zero accident situation more full pond is put in a suitable place to breed; As put in juvenile prawn process in examination or after shrimp seedling puts in a suitable place to breed, to find in shrimp pond wild fishes and fry more time adopt derris extract to be killed, consumption is 0.5mg/kg;
(4) throwing is raised and applies fertilizer
Seedling stage dietary protein level 40-42%, fat content 6-8%; Dietary protein level 38-40%, fat content 7-10% after the long 6cm of body;
Throw feeding method
Place is raised in throwing: the cultivation initial stage raises in the 0.3 meter of throwing of the surrounding depth of water, along with constantly growing up of shrimp body, progressively throw to deep water place and raise, but the depth of water can not more than 0.7 meter; Feed can not be thrown in the trench, in order to avoid pollute the habitat of shrimp; Throw to raise simultaneously and want evenly, to ingest in order to shrimp;
The time is raised in throwing: just put in a suitable place to breed in one week, as in water body, plankton is many, can not throw something and feed; After putting seven days in a suitable place to breed, throw something and feed every day 3 ~ 4 times;
Carrying out observation work: to ingest situation to grasp Macrobrachium rosenbergii, in pond, establishing a few place to expect platform, throw in feed, observe the surplus and deficiency situation of Macrobrachium rosenbergii to the hobby of feed and feed, be beneficial to the adjustment throwing amount of raising and forage protein content;
Raise feed in latter 2 hours as thrown to be eaten up by shrimp very soon, next time just should increase daily ration, feeding quantity; Otherwise material platform being raised as having a surplus, illustrating that throwing is raised too much, next time just should reduce or suspend throwing and raise; The throwing amount of raising that usual what is called is suitable is that after requirement throwing is raised, feed was eaten up at 2-3 hour;
Fertilising:
As long as the pond of usual cultivation Macrobrachium rosenbergii basal dressing before shrimp seedling is put in a suitable place to breed, in breeding process, normal throwing is raised, and water transparence just can keep 30 centimetres, so also does not just need to impose base manure again; But in cultivation practice, also there are some ponds due to Aquatic Higher Plants amount reproduction, cause pond water quality to reduce, also answer spraying fertilizer; Topdress and adopt inorganic fertilizer amino acid rich water element, the quantity of fertilising and number of times with on a small quantity, repeatedly for principle; Concrete grasp decides according to water colour, and after fertilising, transparency is advisable to reach 30 centimetres, and Chi Shui is good with yellow green or breen;
(5) regulating water quality method
1. the decomposition of bed mud organic matter: is utilize idle periods, cuts out too much pond sludge, by dig out pond sludge in order to reinforce trimming pond bank; Two is drain Chi Shui thorough Loss-on-drying at the bottom of the pool to be shone and freezing, and by the permeability of Exposure to Sunlight and freezing increase pond sludge, the reduction material oxidation Decomposition in promotion pond sludge becomes simple mineral salt;
2. spraying fertilizer is answered when water quality transparency is more than 50 centimetres;
3. improve aerator availability: every 4-5 mu configures an aerator, fine day is opened noon, evening rainy day opened, sultry sky is opened in advance the cloudy day, occur raising the nose above water to breathe to open continuously;
(6) fish for
When high-density breeding requires that part shrimp specification reaches every kilogram of 120 tail, catch and stay greatly little, fished for once every 13-16 days, small dimension shrimp continues to put the pool and raises;
During juvenile prawn intermediate rearing, shrimp seedling body length is during 0.7-2cm: its feedstuff feeding amount by shrimp seedling body weight 200% progressively reduce to 10% of shrimp seedling body weight; During long more than the 2cm of shrimp seedling body: feedstuff feeding amount progressively reduces to 5% of shrimp seedling body weight by 10% of shrimp seedling body weight.
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