CN101933471A - Method for delaying sex reversal of finless eels - Google Patents
Method for delaying sex reversal of finless eels Download PDFInfo
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- CN101933471A CN101933471A CN2009100911193A CN200910091119A CN101933471A CN 101933471 A CN101933471 A CN 101933471A CN 2009100911193 A CN2009100911193 A CN 2009100911193A CN 200910091119 A CN200910091119 A CN 200910091119A CN 101933471 A CN101933471 A CN 101933471A
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- swamp eel
- eels
- eel
- finless
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
- Y02A40/81—Aquaculture, e.g. of fish
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Abstract
The invention relates to a method for delaying the sex reversal of finless eels, which is characterized by comprising the following steps of: under artificial breeding condition, obtaining a great number of 2-age physically-healthy finless eels of the same specification by adopting soilless aquatic breeding in a cement pit; selecting the 2-age finless eels of the same specification for breeding in the soilless cement pit in the June to November of every year, and adding a small amount of nilestriol into compound feeds for feeding the finless eels; keeping breeding the finless eels in the cement pit and stopping the feeding in the November of the same year to the March of the next year; keeping breeding the finless eels in the cement pit and feeding the finless eels again in the April to the May of the next year; and from 2 weeks before the induced spawning of the finless eels on, stopping adding the nilestriol into the feeds for feeding the finless eels. The method has the advantages of delaying the sex reversal of finless eel parents by more than 6 months, achieving the female rate of 95 to 100 percent, improving the fecundity of female finless eel parents by 18 to 25 percent, increasing the number of fries by 15 to 20 percent and meeting the requirements of large-scale eel breeding on the fries.
Description
Technical field:
The present invention relates to a kind of postponement swamp eel sex reversal time method, belong to the fishery science applied technical field.
Background technology:
Swamp eel is one of main famous-brand and high-quality fish of China, and breed development in recent years is very rapid, and it is mainly cultured the producing region and is dispersed throughout provinces such as Hubei, Hunan, Anhui, Jiangxi, Zhejiang.Culture of swamp eel has become the leading industry of some regional culture fisheries.
But at present; the required seed of culture of swamp eel is mainly based on wild resource; wild swamp eel seed all can not be satisfied the scale and the industrialization needs of culture of swamp eel at aspects such as the time of putting in a suitable place to breed, quality and quantity and sources; therefore, the artificial batch process of swamp eel seed is to carry out the inevitable demand that eel is supported in scale.Yet, swamp eel existence in its history of life reverses phenomenon, the first half of one's life that is swamp eel is female for individual less function, be that individual bigger function is male the latter half of one's life, finally cause problems such as the individual size of the little and female male parent of the individuality of female eel parent in the artificial propagation process and fish brood amount is inharmonious, seed breeding quantity and scale are restricted.Therefore, obtaining individual female eel parent big, that quantity is many is the key that the swamp eel seedling is produced in batches.
Summary of the invention:
The purpose of this invention is to provide a kind of postponement above female swamp eel sex reversal time method in 2 ages, can obtain the female parent of big individuality of a large amount of specification unanimities, effectively improve colony's fertility of the female parent of swamp eel, satisfy the seedling requirement that eel is supported in scale.
The present invention realizes above-mentioned purpose by following technical solution.
(1), propagating artificially of 2 full age swamp eels:
Propagating artificially under the condition, taking cement pit not have the mode that native pasture and water are cultured, culturing the 2 full age swamp eels that obtain a large amount of specification unanimities, physical health, 2 full age swamp eels were formed in annual 6～August;
(2), keeping of phase I swamp eel ovarian function:
Annual 6～November, select 2 full age swamp eels of specification unanimity in no soil-cement pond, to culture, throw in manufactured feed every day, [3-(cyclopentyloxy)-19-removes first-17-pregnant steroid-1 to add a spot of Nilestriol in manufactured feed, 3,5 (10)-triolefins-20-alkynes-16 α, 17 salmefamols];
(3), swamp eel survives the winter:
Then March in November to next year, swamp eel continues to culture in cement pit and stops to throw something and feed;
(4), keeping of second stage swamp eel ovarian function:
April in next year, swamp eel continues to culture threw something and fed in cement pit and again to May; Throw in manufactured feed every day, swamp eel is being hastened parturition preceding 2 weeks, the feed of throwing something and feeding stops to add Nilestriol.
During whole breed, in the manufactured feed of throwing in, add the Nilestriol of 8～12mg/kg; The protein level of manufactured feed is controlled in 40%; The fresh manufactured feed of throwing something and feeding every day was in time collected and is dealt carefully with residual bait in case polluted water in second day; Refresh the water periodically weekly, to keep good water quality and ecotope; Regularly sterilize with the povidone iodine of concentration 2mg/L weekly.
The present invention has following beneficial effect compared with prior art:
1, swamp eel parent's the sex reversal time can postpone more than 6 months, and ratio of female is 95%～100%; Can obtain the female parent of big individuality of a large amount of specification unanimities.
2, colony's fertility of female swamp eel parent improves 18%～25%, and the corresponding raising 15%～20% of seed quantity has effectively improved colony's fertility of the female parent of swamp eel, can satisfy the seedling requirement that eel is supported in scale.
Embodiment:
Implementing the present invention, is example with the Jianghan Plain area, can carry out according to the following steps:
1, propagating artificially of 2 full age swamp eels:
Propagating artificially under the condition, taking cement pit not have the mode that native pasture and water are cultured, culturing the 2 full age swamp eels that obtain a large amount of specification unanimities, physical health.2 full age swamp eels were formed in annual 6～August.
2, keeping of phase I swamp eel ovarian function:
Annual 6～November, select 2 full age swamp eels of specification unanimity in the no soil-cement pond of 8.0m * 4.5m * 1.8m, to culture.The depth of water in the cement pit is at 1.0～1.2m, and the pool inner water face is planted the Eichhornia crassipes of 2/3 area; Arrange that more than cement pit 2m black plastic cloth is to avoid sunlight direct projection and pool inner water temperature too high.Throw in manufactured feed in the fixed position of 18:00～19:00 in cement pit every day at dusk, [3-(cyclopentyloxy)-19-removes first-17-pregnant steroid-1 to add the Nilestriol of 8～10mg/kg in the manufactured feed, 3,5 (10)-triolefins-20-alkynes-16 α, 17 salmefamols], the protein level of manufactured feed is controlled in 38%; Feeding volume is satiated with food with swamp eel and is advisable, and the amount of being satiated with food is as the criterion so that a small amount of residual bait to be arranged second day early morning.This stage throws something and feeds and contains the feed of Nilestriol, and the ovary of swamp eel is maintained III developmental stage phase.
3, swamp eel survives the winter:
Then March in November to next year, swamp eel continues to culture in cement pit and stops to throw something and feed.The depth of water of phase of surviving the winter is 1.5m.
4, keeping of second stage swamp eel ovarian function:
April in next year, swamp eel continues to culture threw something and fed in cement pit and again to May.The feed of throwing something and feeding is the chyme that silver carp and powdery manufactured feed are made with mass ratio 7-8: 3-2, and the protein level of manufactured feed is controlled at 36%～40%, adds the Nilestriol of 10～12mg/kg in the manufactured feed.Throw in manufactured feed in the fixed position of 18:00～19:00 in cement pit every day at dusk, and feeding volume is satiated with food with swamp eel and is advisable.This stage throws something and feeds and contains the feed of Nilestriol, and the ovary of swamp eel is maintained III～IV developmental stage phase.Swamp eel is being hastened parturition preceding 2 weeks, the feed of throwing something and feeding stops to add Nilestriol.
5, the health control of close eel:
During the whole breed, the fresh manufactured feed of throwing something and feeding every day was in time collected and is dealt carefully with residual bait in case polluted water in second day; Refresh the water periodically weekly, to keep good water quality and ecotope; Regularly sterilize weekly, sterilization method is: the povidone iodine with concentration 2mg/L is evenly splashed.
Claims (4)
1. postpone swamp eel sex reversal time method for one kind, it is characterized in that: may further comprise the steps:
(1), propagating artificially of 2 full age swamp eels:
Propagating artificially under the condition, taking cement pit not have the mode that native pasture and water are cultured, culturing the 2 full age swamp eels that obtain a large amount of specification unanimities, physical health, 2 full age swamp eels were formed in annual 6～August;
(2), keeping of phase I swamp eel ovarian function:
Annual 6～November, select 2 full age swamp eels of specification unanimity in no soil-cement pond, to culture, throw in manufactured feed every day, [3-(cyclopentyloxy)-19-removes first-17-pregnant steroid-1 to add a spot of Nilestriol in manufactured feed, 3,5 (10)-triolefins-20-alkynes-16 α, 17 salmefamols];
(3), swamp eel survives the winter:
Then March in November to next year, swamp eel continues to culture in cement pit and stops to throw something and feed;
(4), keeping of second stage swamp eel ovarian function:
April in next year, swamp eel continues to culture threw something and fed in cement pit and again to May; Throw in manufactured feed every day, swamp eel is being hastened parturition preceding 2 weeks, the feed of throwing something and feeding stops to add Nilestriol.
2. a kind of postponement swamp eel sex reversal time method according to claim 1 is characterized in that adding the Nilestriol of 8～12mg/kg in manufactured feed.
3. a kind of postponement swamp eel sex reversal time method according to claim 2 is characterized in that the protein level of manufactured feed is controlled in 40%.
4. a kind of postponement swamp eel sex reversal time method according to claim 3 is characterized in that during whole breed, and the fresh manufactured feed of throwing something and feeding every day was in time collected and dealt carefully with residual bait in case polluted water in second day; Refresh the water periodically weekly, to keep good water quality and ecotope; Regularly sterilize with the povidone iodine of concentration 2mg/L weekly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100911193A CN101933471B (en) | 2009-08-07 | 2009-08-07 | Method for delaying sex reversal of finless eels |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100911193A CN101933471B (en) | 2009-08-07 | 2009-08-07 | Method for delaying sex reversal of finless eels |
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| Publication Number | Publication Date |
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| CN101933471A true CN101933471A (en) | 2011-01-05 |
| CN101933471B CN101933471B (en) | 2012-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009100911193A Expired - Fee Related CN101933471B (en) | 2009-08-07 | 2009-08-07 | Method for delaying sex reversal of finless eels |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102870986A (en) * | 2012-09-18 | 2013-01-16 | 中国水产科学研究院淡水渔业研究中心 | Feed for delaying sex reversal time of finless eels and preparation and implementation methods of feed |
| CN103004649A (en) * | 2011-09-23 | 2013-04-03 | 长江大学 | Ecology regulation and control method for delaying sex reversal time of eels |
| CN103621443A (en) * | 2013-11-28 | 2014-03-12 | 长江大学 | Method for breeding female parental finless eels based on intermittent feeding |
| CN104067961A (en) * | 2014-06-07 | 2014-10-01 | 长江大学 | Directional breeding method of female parents of finless eel |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100466901C (en) * | 2002-06-06 | 2009-03-11 | 王太新 | Method for cultivating eel using non-soil small pool |
| CN101095402A (en) * | 2006-06-26 | 2008-01-02 | 朱训猛 | Zoology cultivating method of finless eel |
| CN100493349C (en) * | 2007-07-30 | 2009-06-03 | 华中农业大学 | Artificial regulation method for increasing female eel fecundity |
-
2009
- 2009-08-07 CN CN2009100911193A patent/CN101933471B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103004649A (en) * | 2011-09-23 | 2013-04-03 | 长江大学 | Ecology regulation and control method for delaying sex reversal time of eels |
| CN102870986A (en) * | 2012-09-18 | 2013-01-16 | 中国水产科学研究院淡水渔业研究中心 | Feed for delaying sex reversal time of finless eels and preparation and implementation methods of feed |
| CN103621443A (en) * | 2013-11-28 | 2014-03-12 | 长江大学 | Method for breeding female parental finless eels based on intermittent feeding |
| CN104067961A (en) * | 2014-06-07 | 2014-10-01 | 长江大学 | Directional breeding method of female parents of finless eel |
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| CN101933471B (en) | 2012-05-30 |
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