CN103416330B - Cultivation method for keeping female ricefield eel conversion efficiency - Google Patents
Cultivation method for keeping female ricefield eel conversion efficiency Download PDFInfo
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- CN103416330B CN103416330B CN201310235026.XA CN201310235026A CN103416330B CN 103416330 B CN103416330 B CN 103416330B CN 201310235026 A CN201310235026 A CN 201310235026A CN 103416330 B CN103416330 B CN 103416330B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention belongs to the technical field of aquaculture and particularly relates to a cultivation method for keeping female ricefield eel conversion efficiency. Ricefield eels are all female within one year after born, ricefield eels which are two years old or over two years old can gradually convert into male and have special sex reversal. In the prior art, the female ricefield eels are small and the fish brooding amount is small, which becomes one of key factors in restricting fry breeding of the ricefield eels. According to the cultivation method, the appropriate cultivation environment is selected, a female ricefield eel source is selected reasonably, an effective density of released fish is implemented, the content of protein in feed is enhanced properly, scientific feeding, strict management and timely reinforced cultivation and the like are performed; after regulation for one year, the female ricefield eel retention rate reaches 95%, the individual fish brooding amount is improved by over one time averagely, and the number of fish brooding amount of the individual female ricefield eel one year old is improved from 250 to 560 on the average after cultivation. The cultivation method solves the bottleneck problem of ricefield eel fry breeding and has extremely good implementation, development and application prospects.
Description
Technical field
The invention belongs to technical field of aquaculture, relevant with the seed breeding technology in aquaculture, the present invention is specifically related to a kind of breeding method keeping female ricefield eel conversion efficiency.
Background technology
Swamp eel has become one of domestic important aquatic products with exporting goods and earning foreign currency of China, and because its market demand and price constantly rise, stimulate people to excessively capture aggravation, cause wild resource to be on the verge of exhaustion, therefore, wild seed fundamentally cannot meet the demand of swamp eel industry.As can be seen here, artificial seed becomes the bottleneck problem of restriction swamp eel industry.Again because swamp eel has special sex reversal phenomenon, more than 2 ages and 2 ages progressively change into male, therefore, female individuals is little, and fish brood amount is few, becomes one of key factor of restriction seed breeding.So, female sex reversal phenomenon must be regulated and controled, thus keep female ricefield eel conversion efficiency, for the industrialized development of swamp eel provides technical support.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of breeding method keeping the female eel conversion ratio of swamp eel is provided, namely the percentage that in keeping swamp eel property to transform, female eel transforms, method of the present invention comprises the suitableeest nurturing an environment of selection, choose reasonable female eel source, reasonable implementation breeding density, is suitable for improving protein content in feed, science is fed, strict control and the method such as reinforced cultivating in time, obtain the female parent of high fish brood amount in enormous quantities, to meet the demand that artificial seed breeds.
The present invention is achieved through the following technical solutions:
Keep a breeding method for the female eel conversion ratio of swamp eel, its step comprises:
1) water quality of cultivating pool and cultivation: the cultivating pool selecting area 3300-13320 square metre (5-20 mu, every mu by 666 square metres of calculating), keep depth of water 1.5-1.8m, water quality is well pollution-free;
2) clean up the pond and sterilization: clean up the pond by quicklime 120kg dry method for every 666 square metres, after 1 week, the new water of filling, keeps depth of water 1.5-1.8m;
3) arrange without native net cage: arrange net cage at the middle and upper levels at pond waters, without soil in case, cage size is 3m × 2m × 1.2m, and make by every centimetre of 7 object polyethylene mesh sheet, net cage setting position is 0.5m on the water surface, and underwater 0.7m, fixes with wood; Net cage lid is not set;
4) net cage pasture and water are transplanted: net cage starts transplanting and perches nest and water peanut plant arrange 7 days in pond after, pasture and water area accounts for 75% of net cage area;
5) female eel source: artificial propagation 1 age female eel seed;
6) female eel is selected: select annual April body weight 25g, anosis, bouncing 1 age female eel cultivate;
7) breeding density: before putting in a suitable place to breed, sterilizes 20 minutes by the povidone iodine of 15ppm, and female eel breeding density is 2kg/m
2;
8) dietary protein level: the content of manufactured feed protein is 46%;
9) feedstuff feeding: after artificial seed's inlet, to throw something and feed the same day earthworm, feeding volume is 1% of female eel body weight, 2 feeding points established by every case, within 3rd day, increase fish gruel and earthworm, their feeding volume is respectively 0.5% of female eel body weight and starts to increase the expanded pellet feed that protein content is 46% in earthworm and fish gruel for 1% 4th days, feedstuff feeding amount is 0.25% of female eel body weight, so far after after, feedstuff feeding amount is progressively increased to 0.75% of female eel body weight, to ingest actual conditions depending on seed, by earthworm, fish gruel and expanded pellet feed are respectively by the 1-2% of female eel body weight, 1-2% and 1-1.5% throws something and feeds, every day throws something and feeds once at dusk,
10) aquaculture management: throw something and feed period, monthly to splash cultivating pool 1 time with quicklime water, consumption is every cubic metre of water body 0.015kg; Enter by the end of September, the total amount of above-mentioned Three feed is no more than 3.5% of female eel body weight; Stop throwing something and feeding feed by the end of October;
11) survive the winter: enter November, eel seedling is survived the winter in former cultivation net cage, and the pond depth of water remains unchanged, and is at least stabilized in 1.5m.If freeze in pond and in net cage, punching oxygenation of should opening ice, keeps the female eel of swamp eel normally to survive the winter in net cage;
12) reinforced cultivating after the beginning of spring: start Feeding time and select at the beginning of by the end of March or 4 months next year, as long as water temperature rises to 18 DEG C, just start above-mentioned feed of throwing something and feeding;
13) select to start feed of throwing something and feeding: start in 5 days after throwing something and feeding, to throw something and feed earthworm by the 0.5-1% of female eel body weight, the 6th day, feed is adjusted to the rotten and expanded pellet feed of earthworm, fish, its ratio is respectively 0.5%, 0.5% and 0.25% of female eel body weight;
14) proceed to and normally throw something and feed: from the 7th day, proceed to and normally throw something and feed; To ingest concrete condition depending on female eel, by earthworm, fish, rotten and expanded pellet feed is progressively increased to respectively and throws something and feeds by 1-2%, 1-2% and 1-1.5% of female eel body weight, still throws something and feeds once at dusk in every day.
Embodiment
Below in conjunction with embodiment, further the present invention is elaborated, but the present invention does not limit which.
Embodiment 1:
1. pond is without native raising in cage environment
1) pond and water quality: select area 3300-13320 square metre of (5-20 mu, every mu by 666 square metres of calculating) cultivating pool, keep depth of water 1.5-1.8m, water quality is well pollution-free (see: pollution-free food aquiculture fresh water water quality, standard No.: NY5051-2001, download address: Zhejiang Province's standard information and the public platform of sci-tech innovation of quality safety: http://www.spsp.gov.cn/Page/QT/2001/NY%205051-2001.shtml).
2) clean up the pond and sterilization: clean up the pond by quicklime 120kg dry method for every 666 square metres, after 1 week, the new water of filling, keeps depth of water 1.5-1.8m.
3) arrange without native net cage: at pond waters, net cage is set at the middle and upper levels, without soil in case.Cage size is 3m × 2m × 1.2m, makes, fix with wood by every centimetre of 7 object polyethylene mesh sheet.Net cage is in 0.5m on the water surface, underwater 0.7m.Net cage uncovered.
4) net cage pasture and water are transplanted: net cage starts transplanting and perches nest-water peanut arrange 7 days in pond after, pasture and water area accounts for 75% of net cage area.
2. female eel source and selection
1) female eel source: for artificial propagation 1 age female eel seed.
2) female eel is selected: select annual April body weight 25g, anosis, bouncing 1 age female eel cultivate.
3) breeding density: before putting in a suitable place to breed, with the povidone iodine of 15ppm sterilization water body 20 minutes, breeding density was 2kg/m
2.
3. forage protein content with throw something and feed
1) forage protein content: expanded pellet feed (Xiamen of Fujian Province Jia Sheng feed corporation,Ltd) protein content is 46%.
2) throw something and feed: after artificial seed's inlet, to throw something and feed the same day earthworm, feeding volume is 1% of female eel body weight, 2 feeding points established by every case, within 3rd day, increase fish gruel and earthworm, their feeding volume is respectively 0.5% of female eel body weight and starts to increase the expanded pellet feed that protein content is 46% in earthworm and fish gruel for 1% 4th days, expanded pellet feed feeding volume is 0.25% of female eel body weight, after forage volume is progressively increased to 0.75%, to ingest actual conditions depending on seed, earthworm, fish is rotten, expanded pellet feed is respectively by the 1-2% of female eel body weight, 1-2% and 1-1.5% throws something and feeds, every day throws something and feeds once at dusk.
4. manage and survive the winter
1) manage: throw something and feed period, monthly splash 1 time by the quicklime water of every cubic metre of water body 0.015kg, enter by the end of September, three kinds of earthworms, fish total amounts that are rotten, expanded pellet feed are no more than 3.5% of female eel body weight.Stop by the end of October throwing something and feeding.
2) survive the winter: enter November, female for swamp eel eel survived the winter in former cultivation net cage, the pond depth of water remains unchanged, and is at least stabilized in 1.5m.If freeze in pond and in net cage, punching oxygenation of should opening ice, keeps the female eel of swamp eel normally to survive the winter in net cage.
5. the reinforced cultivating after the beginning of spring
1) select to start Feeding time: at the beginning of by the end of March or 4 months next year, as long as water temperature rises to 18 DEG C, just start relevant feed of throwing something and feeding.
2) start to throw something and feed time of feed and consumption: start in 5 days after throwing something and feeding, and to throw something and feed earthworm by the 0.5-1% of female eel body weight; 6th day, feed is adjusted to earthworm, fish gruel and expanded pellet feed, its ratio was respectively 0.5%, 0.5% and 0.25% of female eel body weight.
3) time of normally throwing something and feeding and consumption is proceeded to: from the 7th day, proceed to and normally throw something and feed.To ingest concrete condition depending on female eel, the rotten and expanded pellet feed of earthworm, fish is progressively increased to respectively throws something and feeds by 1-2%, 1-2% and 1-1.5% of female eel body weight, still throws something and feeds once at dusk in every day.
With this method cultivate to next year by the end of April or the first tenday period of a month in May, the body weight of female eel can reach 150-200g, and female eel conservation rate reaches 95%, and fish brood amount on average improves more than 1 times, namely by 1 age average 250 bring up to cultivate after average out to 560.Now namely can be used as the male eel mate and oviposit of the female close eel of high-quality and maturation to be fertilized.
Claims (1)
1. keep a breeding method for the female eel conversion ratio of swamp eel, it is characterized in that the following step:
1) water quality of cultivating pool and cultivation: the cultivating pool selecting area 3300-13320 square metre, keep depth of water 1.5-1.8m, water quality is well pollution-free;
2) clean up the pond and sterilization: clean up the pond with quicklime 120 ㎏ for every 666 square metres, after 1 week, the new water of filling, keeps the depth of water 1.5-1.8m;
3) arrange without native net cage: arrange net cage at the middle and upper levels at pond waters, without soil in case, cage size is 3m × 2m × 1.2m, makes, and fix with wood by every centimetre of 7 object polyethylene mesh sheet; Net cage position is in 0.5m on the water surface, underwater 0.7m, does not arrange net cage lid;
4) net cage pasture and water are transplanted: net cage starts transplanting and perches nest and water peanut plant arrange 7 days in pond after, water peanut plant area accounts for 75% of net cage area;
5) female eel source: artificial propagation 1 age female eel seed;
6) female eel is selected: select annual April body weight 25g, anosis, bouncing 1 age female eel cultivate;
7) breeding density: before putting in a suitable place to breed, sterilizes 20 minutes by the povidone iodine of 15ppm, and female eel breeding density is 2kg/m
2;
8) dietary protein level: the content of manufactured feed protein is 46%;
9) feedstuff feeding: after artificial seed's inlet, to throw something and feed the same day earthworm, feeding volume is 1% of female eel body weight, 2 feeding points established by every case, within 3rd day, increase fish gruel and earthworm, its feeding volume is respectively 0.5% and 1% of female eel body weight, beginning in 4th day increases the expanded pellet feed that protein content is 46% in earthworm and fish gruel, the feeding volume of expanded pellet feed is 0.25% of female eel body weight, so far after after, the feeding volume of expanded pellet feed is progressively increased to 0.75% of female eel body weight, to ingest actual conditions depending on seed, by earthworm, fish gruel and expanded pellet feed are respectively by the 1-2% of female eel body weight, 1-2% and 1-1.5% throws something and feeds, every day throws something and feeds once at dusk,
10) aquaculture management: throw something and feed period, monthly to splash cultivating pool 1 time with quicklime water, consumption is every cubic metre of water body 0.015kg; Enter by the end of September, by step 9) described in earthworm, fish total amount that is rotten and expanded pellet feed be no more than 3.5% of female eel body weight; Stop throw something and feed earthworm, fish gruel and expanded pellet feed by the end of October;
11) survive the winter: enter November, eel seedling is survived the winter in former cultivation net cage, and the pond depth of water remains unchanged, and is at least stabilized in 1.5m; If freeze in pond and in net cage, punching oxygenation of should opening ice, keeps the female eel of swamp eel normally to survive the winter in net cage;
12) reinforced cultivating after the beginning of spring: start Feeding time and select at the beginning of by the end of March or 4 months next year, as long as water temperature rises to 18 DEG C, just start to throw something and feed by step 9) described in the rotten and expanded pellet feed of earthworm, fish;
13) select to start feed of throwing something and feeding: start in 5 days after throwing something and feeding, to throw something and feed earthworm by 0.5-1% of female eel body weight, the 6th day, be adjusted to the rotten and expanded pellet feed of earthworm, fish, its ratio is respectively 0.5%, 0.5% and 0.25% of female eel body weight;
14) proceed to and normally throw something and feed: from the 7th day, proceed to and normally throw something and feed, to ingest concrete condition depending on female eel, 1-2%, 1-2% and 1-1.5% that by earthworm, fish, rotten and expanded pellet feed is progressively increased to female eel body weight respectively throw something and feed, and throw something and feed once at dusk in every day.
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| CN103004649A (en) * | 2011-09-23 | 2013-04-03 | 长江大学 | Ecology regulation and control method for delaying sex reversal time of eels |
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