CN102986570A - Method for increasing fry collecting rate and young fry survival rate of ricefield eels in artificial propagation - Google Patents

Method for increasing fry collecting rate and young fry survival rate of ricefield eels in artificial propagation Download PDF

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Publication number
CN102986570A
CN102986570A CN201210553107XA CN201210553107A CN102986570A CN 102986570 A CN102986570 A CN 102986570A CN 201210553107X A CN201210553107X A CN 201210553107XA CN 201210553107 A CN201210553107 A CN 201210553107A CN 102986570 A CN102986570 A CN 102986570A
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seedling
ovum
net cage
bubble
time
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CN102986570B (en
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柳凌
朱祥云
张洁明
郭峰
张涛
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Yangtze River Fisheries Research Institute CAFS
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Yangtze River Fisheries Research Institute CAFS
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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 a method for increasing the fry collecting rate and the young fry survival rate of ricefield eels in artificial propagation, comprising the following steps of: (1) erecting a propagation net cage; (2) selecting and pairing parent fishes; (3) regularly checking the net cage; (4) determining the fry collecting time; and (5) artificially collecting fries and opening young fries. Through solving the problem that the spawning time of the ricefield eels is not easy to accurately judge in the artificial ricefield eel breeding process, the fry collecting time of the ricefield eels is more accurate, so that the fry collecting rate and the young fry survival rate of the ricefield eels in artificial propagation are effectively increased. The method provided by the invention is simple and feasible, accurate in time projection and can be used for popularizing and applying an artificial ricefield eel propagation technology. By using the method, the fry collecting rate of the ricefield eels is increased from about 60% to over 90%, and the young fry survival rate is increased from about 70% to over 95%.

Description

A kind of collection seedling rate in the swamp eel artificial propagation and method of survival rate of seedling of improving
Technical field
The invention belongs to technical field of aquaculture, be specifically related to a kind of collection seedling rate in the swamp eel artificial propagation and method of survival rate of seedling of improving, method is simple, and is easy and simple to handle.
Background technology
Swamp eel (Monopterus albus) is the subtropics fish, has another name called yellow eel, sieve fish, field eel, Changyu, yellow ginseng, without squama son, Tian Can etc., is under the jurisdiction of Symbranchir, closes gill section; The whole world only has a kind, i.e. swamp eel in the Symbranchir.Be distributed widely in Japan, Thailand, Indonesia, Philippine, Malaysia, India, Japan, Korea and the China etc. in Southeast Asia, all there is distribution in China except the Qinghai-Tibet Platean, especially with In Middle And Lower Reaches of Changjiang River, distribution density is large, output is high, is a kind of important economic fish.
At present, natural spawning is mainly still adopted in the artificial propagation of swamp eel, natural insemination and the method for naturally hatching.Swamp eel has very strong manor concept when breeding, milter can be driven other swamp eel out of manor before laying eggs, and then the water plants root is nested in the manor.Ovum produces in nest, and milter will be protected nest therebetween at incubating oosperm.When protecting nest, the continuous Tu Pao of milter meeting is rolled in egg follicle in the foam.The method of swamp eel artificial propagation is manually matched to swamp eel exactly, they is placed in the specific zone, as: 1.5M 2Net cage.Plant upper water plants in the net cage, then observe whether Tu Pao of swamp eel, in case found the swamp eel Tu Pao of pairing, just think that they may have been laid eggs, according at that time water temperature, determine the opportunity that collect seedling again.
The collection seedling of swamp eel is very important link in the swamp eel artificial propagation process, hold collection seedling opportunity accurately whether, will directly affect the collection seedling rate of swamp eel seedling and the survival rate of seedling.The collection seedling time is too early, seedling after entering training seedling case, timely initial feeding, survival rate of seedling can be very low.The collection seedling time is excessively late, and seedling can cause can not receive seedling from migration in the hatching nest, and collection seedling rate is very low.Correct receipts seedling is that front 1 day of seedling opening is the best opportunity opportunity.
In general, under certain water temperature, the time of swamp eel from development of fertilized ova to the opening seedling is certain, as: this development time is 9 days under 28 ℃ of water temperatures.Therefore, as long as know in theory the egg-laying time of swamp eel, just can calculate the collection seedling time of swamp eel seedling.But in actual production, the egg-laying time of swamp eel is owing to following reason is difficult to accurately judge.At first, the swamp eel disguise of laying eggs is very strong.Swamp eel can be selected the very luxuriant place of aquatic plants growth when nesting, the inspection personnel is difficult to the foam that the discovery swamp eel tells.When finding foam, might just lay eggs before 1,2 day, also may in time have been found, cause egg-laying time to be difficult to judge.Secondly, the swamp eel rear milter that lays eggs is certain to Tu Pao, but milter Tu Pao, and raun might not just lay eggs at once, have therebetween 48 hours treat term that this also causes egg-laying time to be difficult to judge.At last, raun is in the process of laying eggs, because some not clear disturbing factors, can lay eggs by cut after making raun produce several ovum, waits for after 2 ~ 3 days more large quantities of laying eggs, and judges whether large quantities of having laid eggs also is a difficult problem to swamp eel.
The present invention makes the collection seedling time of swamp eel more accurate, thereby effectively improves collection seedling rate and survival rate of seedling in the swamp eel artificial propagation by solving the difficult problem in this swamp eel artificial propagation of swamp eel egg-laying time.
Summary of the invention
The objective of the invention is to be to provide a kind of collection seedling rate in the swamp eel artificial propagation and method of survival rate of seedling of improving, easy to implement the method, easy and simple to handle, by solving the difficult problem in difficult this swamp eel artificial propagation accurately judged of swamp eel egg-laying time, make the collection seedling time of swamp eel more accurate, thereby effectively improve collection seedling rate and survival rate of seedling in the swamp eel artificial propagation.
In order to achieve the above object, the present invention adopts following technical measures:
A kind of collection seedling rate in the swamp eel artificial propagation and method of survival rate of seedling of improving the steps include:
1. the breeding net cage sets up: swamp eel breeding net cage size is 1.0 * 1.5M 2, mesh is 0.4mm, and net cage bottom 20cm is buried in the earth, and the depth of water is 15 ~ 20cm in the net cage, and net cage exceeds the water surface 35 ~ 40cm.Each net cage is thrown in the weter hyacinth that accounts for net cage area about 2/3.Net cage is longitudinal arrangement in the pond, and the net cage spacing is 0.5M in every delegation, and two in the ranks spacings are 1M.After having set up, each net cage is numbered.Method for numbering serial is that Roman number represents line number, and Arabic numerals represent the case number (CN) of this row.As: II-56 represents No. 56 case of the 2nd row.
2. the selection of parent population and pairing: the swamp eel parent population that cultivates is pulled out from the parent fish rearing case, selected physique healthy and strong, disease-free, atraumatic swamp eel is used parent population as breeding.The milter selective body focuses on 200 ~ 300g, and belly is without obviously expanding the little red parent population of gonopore.The raun selective body focuses on 75 ~ 150g, and belly obviously expands, the parent population that gonopore expands and caves in.Each breeding net cage is by 4 tail rauns, and 2 tail milters match input.
3. make regular check on net cage: the beginning in the 5th day after the pairing of swamp eel parent population is finished checks each net cage every day, observes and records swamp eel and tell the bubble situation.Swamp eel tells the bubble situation and is divided into 3 kinds: the 1st, and bubble is arranged, but cannot see ovum in the bubble; The 2nd, seen ovum in the bubble, but not variable color of ovum; The 3rd, seen ovum in the bubble, and variable color of ovum.Steeped when net cage has, done the record of telling the bubble situation and the double labelling of net cage position and Tu Pao position, the present invention is at the net cage look plate mark net cage of hanging up red festoons, and marking on the leaves of hyacinth of foam position, in order to can find rapidly during check.
4. determine the collection seedling time:
According to review result, follow these steps to determine the collection seedling time of nest ovum.
The first step: when finding that swamp eel tells bubble the 1st time, if bubble is upper without ovum, then treat the second step observation; If on the bubble ovum is arranged, but there is not variable color, then count from this sky to pusher 8 days, namely be the collection seedling time of this nest ovum.If the ovum variable color is then counted to pusher 5 days from this sky, namely is the collection seedling time of this nest ovum.
Second step: find that the 3rd day of foam check this nest foam.Equally, if on the bubble still without ovum, treat that then the 3rd step observed; If on the bubble ovum is arranged, but there is not variable color, then count to pusher 8 days from checking this sky, namely be the receipts seedling time of this nest ovum.If the ovum variable color is then counted to pusher 5 days from checking this sky, namely is the receipts seedling time of this nest ovum.
The 3rd step: find that the 5th day of foam check this nest foam.If still without ovum, from finding that foam counts to pusher 9 days that day for the 1st time, namely be the receipts seedling time of this nest ovum then on the bubble.If on the bubble ovum is arranged, but there is not variable color, then count to pusher 8 days from checking this sky, namely be the receipts seedling time of this nest ovum.If the ovum variable color is then counted to pusher 5 days from checking this sky, namely is the receipts seedling time of this nest ovum.
Should note when calculating: if the first step just finds that ovum has been arranged, can directly extrapolate the collection seedling time, not need to carry out second step and the 3rd step; Equally, carry out second step and find that ovum has been arranged, also carried out for the 3rd step again with regard to not needing.
5. manually collect seedling and seedling opening:
When arriving the collection seedling day after date of calculating, should in time seedling be packed up.When receiving seedling, frothy weter hyacinth is proposed from net cage, weter hyacinth is directly put into the seedling opening box together with seedling.The opening box size is 40 * 30cm, depth of water 10cm.One end of box has pipeline to drip in box, and speed of dropping water is 1 ~ 2 drops/sec.Every box is put 1 ~ 2 nest seedling, will hatch in advance simultaneously good fairy shrimp and put into box, and every box is put 1 ~ 2g every day.After 3 days, weter hyacinth is taken out from opening box, record the number of dead seedling, change seedling over to training seedling case and cultivate.
If the reckoning time is correct, fry will all be attached to the weter hyacinth root this moment; If the reckoning time is wrong, the weter hyacinth root is without fry.Collection seedling rate is to receive the net cage number of seedling and the ratio (the part net cage can not receive seedling) between total net cage number.Adopt this method that the collection seedling rate of swamp eel is brought up to more than 90% by about 60%, survival rate of seedling is brought up to more than 95% by about 70%.
Compared with prior art, the present invention has following characteristics:
Compare with other fish collection seedling-growing method:
At present, the artificial propagation of fish mainly is divided into 2 large classes, the one, artificial induced spawning; Artificial insemination; Artificial incubation.As: four large Chinese carps, carp; Crucian; The fish such as megalobrama amblycephala.This modes of reproduction all is by incubation equipment automatic collecting seedling, the collection seedling time judgement on without any difficulty.The 2nd, artificial induced spawning; Natural spawning; Naturally hatching.As: the fish such as southern catfish, loach, Cha Wei Channel-catfish.Although this modes of reproduction is the nature hatching, parent population is not protected nest, and the developmental state of seedling can be pulled out to observe at any time.Therefore, in the judgement of collection seedling time, also have no problem.
The artificial propagation mode of swamp eel is unique in the present artificial propagation of fish, and therefore, the collection seedling-growing method of other fish and it does not have comparativity.Before not invention this method, the collection seedling time of swamp eel artificial propagation is the form according to the swamp eel foam, judges in conjunction with breeding personnel's experience.Adopt method of the present invention, there were significant differences for its collection seedling effect.This method is simple, easily go, and time reckoning is accurate, is convenient to applying of swamp eel artificial propagation techniques.Adopt this method that the collection seedling rate of swamp eel is brought up to more than 90% by about 60%, survival rate of seedling is brought up to more than 95% by about 70%.
Embodiment
Embodiment 1:
A kind of collection seedling rate in the swamp eel artificial propagation and method of survival rate of seedling of improving the steps include:
1. parent population pairing: the swamp eel parent population that cultivates is pulled out from the parent fish rearing case, selected physique healthy and strong, disease-free, atraumatic swamp eel is used parent population as breeding.The milter selective body focuses on 200 ~ 300g, and belly is without obviously expanding the little red parent population of gonopore.The raun selective body focuses on 75 ~ 150g, and belly obviously expands, the parent population that gonopore expands and caves in.Each breeding net cage is by 4 tail rauns, and 2 tail milters match input.
2. make regular check on net cage: July 10 found that this net cage had a brood of foam when II-No. 56 net cage is checked, but in the foam without ovum.This net cage is carried out double labelling, the look plate mark net cage of namely hanging up red festoons on the net cage, and marking on the leaves of hyacinth of foam position.July 12 was checked this net cage, in the foam still without ovum.July 14 checked again, as a result in the foam still without ovum.
3. determine the collection seedling time:
Record and reckoning result are as follows:
Annotate: √ represents to find foam, but in the foam without ovum; In the √ zero expression foam ovum is arranged, but not variable color of ovum; √ ● in the expression foam ovum is arranged, and variable color of ovum.(following examples together)
Should count that day from first discovery foam by this situation of predication method, to pusher 9 days, namely July 19 was the collection seedling date of this nest ovum.
4. manually collect seedling and seedling opening: July 19 in time packed up seedling.When receiving seedling, frothy weter hyacinth is proposed from net cage, the seedling number that is attached to the weter hyacinth root is about about 400 tails.Weter hyacinth is directly put into the seedling opening box together with seedling.Open water dropping openings, regulating speed of dropping water is 1 ~ 2 drops/sec, will hatch in advance simultaneously good fairy shrimp 1 ~ 2g and put into box, and all place by this amount every day.After 3 days, weter hyacinth is taken out from opening box, observing dead seedling number is 8 tails, and calculating survival rate of seedling is 98%.Changing seedling over to training seedling case cultivates.
Embodiment 2:
A kind of collection seedling rate in the swamp eel artificial propagation and method of survival rate of seedling of improving the steps include:
1. parent population pairing: identical with case 1.
2. make regular check on net cage: July 10 found that this net cage had a brood of foam when III-No. 09 net cage is checked, but in the foam without ovum.This net cage is carried out double labelling, the look plate mark net cage of namely hanging up red festoons on the net cage, and marking on the leaves of hyacinth of foam position.July 12 was checked this net cage, in the foam still without ovum.July 14 checked again, and finding has ovum in the foam, but not variable color of ovum.
3. determine the collection seedling time:
Record and reckoning result are as follows:
Should count from finding ovum this day by this situation of predication method, i.e. July 14, to pusher 8 days, namely July 22 was the collection seedling date of this nest ovum.
4. manually collect seedling and seedling opening: July 22 in time packed up seedling.When receiving seedling, frothy weter hyacinth is proposed from net cage, the seedling number that is attached to the weter hyacinth root is about about 400 tails.Weter hyacinth is directly put into the seedling opening box together with seedling.Open water dropping openings, regulating speed of dropping water is 1 ~ 2 drops/sec, will hatch in advance simultaneously good fairy shrimp 1 ~ 2g and put into box, and all place by this amount every day.After 3 days, weter hyacinth is taken out from opening box, observing dead seedling number is 11 tails, and calculating survival rate of seedling is 97.2%.Changing seedling over to training seedling case cultivates.
Embodiment 3:
A kind of collection seedling rate in the swamp eel artificial propagation and method of survival rate of seedling of improving the steps include:
1. parent population pairing: identical with case 1.
2. make regular check on net cage: July 10 found that this net cage had a brood of foam when IV-No. 11 net cage is checked, but in the foam without ovum.This net cage is carried out double labelling, the look plate mark net cage of namely hanging up red festoons on the net cage, and marking on the leaves of hyacinth of foam position.July 12 was checked this net cage, in the foam still without ovum.July 14 checked again, and finding has ovum in the foam, and variable color of ovum.
3. determine the collection seedling time:
Record and reckoning result are as follows:
Should count from finding ovum this day by this situation of predication method, i.e. July 14, to pusher 5 days, namely July 19 was the collection seedling date of this nest ovum.
4. manually collect seedling and seedling opening: July 19 in time packed up seedling.When receiving seedling, frothy weter hyacinth is proposed from net cage, the seedling number that estimation is attached to the weter hyacinth root is about about 300 tails.Weter hyacinth is directly put into the seedling opening box together with seedling.Open water dropping openings, regulating speed of dropping water is 1 ~ 2 drops/sec, will hatch in advance simultaneously good fairy shrimp 1 ~ 2g and put into box, and all place by this amount every day.After 3 days, weter hyacinth is taken out from opening box, observing dead seedling number is 9 tails, and calculating survival rate of seedling is 97%.Changing seedling over to training seedling case cultivates.
Embodiment 4:
A kind of collection seedling rate in the swamp eel artificial propagation and method of survival rate of seedling of improving the steps include:
1. parent population pairing: identical with case 1.
2. make regular check on net cage: July 10 found that this net cage had a brood of foam when V-No. 72 net cage is checked, but in the foam without ovum.This net cage is carried out double labelling, the look plate mark net cage of namely hanging up red festoons on the net cage, and marking on the leaves of hyacinth of foam position.Checked this net cage on July 12, finding has ovum in the foam, but not variable color of ovum.
3. determine the collection seedling time:
Record and reckoning result are as follows:
Should count from finding ovum this day by this situation of predication method, i.e. July 12, to pusher 8 days, namely July 20 was the collection seedling date of this nest ovum.
4. manually collect seedling and seedling opening: July 20 in time packed up seedling.When receiving seedling, frothy weter hyacinth is proposed from net cage, the seedling number that estimation is attached to the weter hyacinth root is about about 500 tails.Weter hyacinth is directly put into the seedling opening box together with seedling.Open water dropping openings, regulating speed of dropping water is 1 ~ 2 drops/sec, will hatch in advance simultaneously good fairy shrimp 1 ~ 2g and put into box, and all place by this amount every day.After 3 days, weter hyacinth is taken out from opening box, observing dead seedling number is 12 tails, and calculating survival rate of seedling is 97.6%.Changing seedling over to training seedling case cultivates.
Embodiment 5:
A kind of collection seedling rate in the swamp eel artificial propagation and method of survival rate of seedling of improving the steps include:
1. parent population pairing: identical with case 1.
2. make regular check on net cage: July 10 found that this net cage had a brood of foam when VI-No. 38 net cage is checked, but in the foam without ovum.This net cage is carried out double labelling, the look plate mark net cage of namely hanging up red festoons on the net cage, and marking on the leaves of hyacinth of foam position.Checked this net cage on July 12, finding has ovum in the foam, and variable color of ovum.
3. determine the collection seedling time:
Record and reckoning result are as follows:
Should count from finding ovum this day by this situation of predication method, i.e. July 12, to pusher 5 days, namely July 17 was the collection seedling date of this nest ovum.
4. manually collect seedling and seedling opening: July 17 in time packed up seedling.When receiving seedling, frothy weter hyacinth is proposed from net cage, the seedling number that estimation is attached to the weter hyacinth root is about about 400 tails.Weter hyacinth is directly put into the seedling opening box together with seedling.Open water dropping openings, regulating speed of dropping water is 1 ~ 2 drops/sec, will hatch in advance simultaneously good fairy shrimp 1 ~ 2g and put into box, and all place by this amount every day.After 3 days, weter hyacinth is taken out from opening box, observing dead seedling number is 10 tails, and calculating survival rate of seedling is 97.5%.Changing seedling over to training seedling case cultivates.
Embodiment 6:
A kind of collection seedling rate in the swamp eel artificial propagation and method of survival rate of seedling of improving the steps include:
1. parent population pairing: identical with case 1.
2. make regular check on net cage: July 10 found that this net cage had a brood of foam when VII-No. 33 net cage is checked, but ovum is arranged in the foam.This net cage is carried out double labelling, the look plate mark net cage of namely hanging up red festoons on the net cage, and marking on the leaves of hyacinth of foam position.
3. determine the collection seedling time:
Record and reckoning result are as follows:
Should count from finding ovum this day by this situation of predication method, i.e. July 10, to pusher 8 days, namely July 18 was the collection seedling date of this nest ovum.
4. manually collect seedling and seedling opening: July 18 in time packed up seedling.When receiving seedling, frothy weter hyacinth is proposed from net cage, the seedling number that estimation is attached to the weter hyacinth root is about about 400 tails.Weter hyacinth is directly put into the seedling opening box together with seedling.Open water dropping openings, regulating speed of dropping water is 1 ~ 2 drops/sec, will hatch in advance simultaneously good fairy shrimp 1 ~ 2g and put into box, and all place by this amount every day.After 3 days, weter hyacinth is taken out from opening box, observing dead seedling number is 6 tails, and calculating survival rate of seedling is 98.5%.Changing seedling over to training seedling case cultivates.
Embodiment 7:
A kind of collection seedling rate in the swamp eel artificial propagation and method of survival rate of seedling of improving the steps include:
1. parent population pairing: identical with case 1.
2. make regular check on net cage: July 10 found that this net cage had a brood of foam when VIII-No. 61 net cage is checked, but ovum is arranged in the foam, and variable color.This net cage is carried out double labelling, the look plate mark net cage of namely hanging up red festoons on the net cage, and marking on the leaves of hyacinth of foam position.
2. determine the collection seedling time:
Record and reckoning result are as follows:
Should count from finding ovum this day by this situation of predication method, i.e. July 10, to pusher 5 days, namely July 15 was the collection seedling date of this nest ovum.
3. manually collect seedling and seedling opening: July 15 in time packed up seedling.When receiving seedling, frothy weter hyacinth is proposed from net cage, the seedling number that estimation is attached to the weter hyacinth root is about about 500 tails.Weter hyacinth is directly put into the seedling opening box together with seedling.Open water dropping openings, regulating speed of dropping water is 1 ~ 2 drops/sec, will hatch in advance simultaneously good fairy shrimp 1 ~ 2g and put into box, and all place by this amount every day.After 3 days, weter hyacinth is taken out from opening box, observing dead seedling number is 13 tails, and calculating survival rate of seedling is 97.4%.Changing seedling over to training seedling case cultivates.

Claims (1)

1. one kind is improved collection seedling rate in the swamp eel artificial propagation and the method for survival rate of seedling, the steps include:
1) the breeding net cage sets up: swamp eel breeding net cage size is 1.0 * 1.5M 2, mesh is 0.4mm, and net cage bottom 20cm is buried in the earth, and the depth of water is 15 ~ 20cm in the net cage, and net cage exceeds the water surface 35 ~ 40cm; Each net cage is thrown in the weter hyacinth that accounts for net cage area 2/3; Net cage is longitudinal arrangement in the pond, and the net cage spacing is 0.5M in every delegation, and two in the ranks spacings are 1M; After having set up, each net cage is numbered, method for numbering serial is that Roman number represents line number, and Arabic numerals represent the case number (CN) of this row;
2) selection of parent population and pairing: the swamp eel parent population that cultivates is pulled out from the parent fish rearing case, selected physique healthy and strong, disease-free, atraumatic swamp eel is used parent population as breeding; The milter selective body focuses on 200 ~ 300g, and belly is without obviously expanding the little red parent population of gonopore; The raun selective body focuses on 75 ~ 150g, and belly obviously expands, the parent population that gonopore expands and caves in, and each breeding net cage is by 4 tail rauns, and 2 tail milters match input;
3) make regular check on net cage: the beginning in the 5th day after the pairing of swamp eel parent population is finished checks each net cage every day, observes and records swamp eel and tell the bubble situation, and swamp eel tells the bubble situation and is divided into 3 kinds: the 1st, bubble is arranged, and cannot see ovum in the bubble; The 2nd, seen ovum in the bubble, ovum is variable color not; The 3rd, seen ovum in the bubble, ovum is variable color; Steeped when net cage has, done the record of telling the bubble situation, and the double labelling of net cage position and Tu Pao position;
4) determine the collection seedling time:
The first step: when finding that swamp eel tells bubble the 1st time, without ovum, second step is observed on the bubble; Ovum is arranged on the bubble, do not have variable color, this sky is counted to pusher 8 days, the collection seedling time of this nest ovum; The ovum variable color, this sky is counted to pusher 5 days, the collection seedling time of this nest ovum;
Second step: find that the 3rd day of foam check this nest foam; Still without ovum, the 3rd step observed on the bubble; Ovum is arranged on the bubble, do not have variable color, check this sky and count to pusher 8 days the receipts seedling time of this nest ovum; The ovum variable color is checked this sky and is counted to pusher 5 days the receipts seedling time of this nest ovum;
The 3rd step: find that the 5th day of foam check this nest foam; Still without ovum, find that foam counts to pusher 9 days the receipts seedling time of this nest ovum that day for the 1st time on the bubble; Ovum is arranged on the bubble, do not have variable color, check this sky and count to pusher 8 days the receipts seedling time of this nest ovum; The ovum variable color is checked this sky and is counted to pusher 5 days the receipts seedling time of this nest ovum;
Artificial collection seedling and seedling opening:
Arrive the collection seedling day after date of calculating, when receiving seedling, frothy weter hyacinth is proposed from net cage, weter hyacinth is directly put into the seedling opening box together with seedling; The opening box size is 40 * 30cm, depth of water 10cm; One end of box has pipeline to drip in box, and speed of dropping water is 1 ~ 2 drops/sec; Every box is put 1 ~ 2 nest seedling, will hatch in advance simultaneously good fairy shrimp and put into box, and every box is put 1 ~ 2g every day; After 3 days, weter hyacinth is taken out from opening box, record the number of dead seedling, change seedling over to training seedling case and cultivate.
CN201210553107.XA 2012-12-19 2012-12-19 Method for increasing fry collecting rate and young fry survival rate of ricefield eels in artificial propagation Expired - Fee Related CN102986570B (en)

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Cited By (6)

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CN103299941A (en) * 2013-07-01 2013-09-18 蒋石容 Method for cultivating and domesticating monopterus fries
CN103404470A (en) * 2013-08-27 2013-11-27 望江志宇特种水产品开发有限公司 Finless eel net cage ecological breeding method
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CN103960186B (en) * 2014-05-14 2016-04-20 中国水产科学研究院长江水产研究所 A kind of method of swamp eel artificial incubation case and hatching
CN104472399A (en) * 2014-10-31 2015-04-01 安徽华亿农牧科技发展有限公司 Intraspecific hybridization breeding method for finless eels
CN104756906A (en) * 2015-03-23 2015-07-08 重庆市涪陵区水洞口养鱼股份合作社 Method for breeding rice field eel fry
CN109197697A (en) * 2018-10-29 2019-01-15 王欣 A kind of half-manual breeding method of monopterus albus fry

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