KR20140137508A - Method for providing enhanced survival and growth of leptocephalus - Google Patents

Method for providing enhanced survival and growth of leptocephalus Download PDF

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Publication number
KR20140137508A
KR20140137508A KR20130057922A KR20130057922A KR20140137508A KR 20140137508 A KR20140137508 A KR 20140137508A KR 20130057922 A KR20130057922 A KR 20130057922A KR 20130057922 A KR20130057922 A KR 20130057922A KR 20140137508 A KR20140137508 A KR 20140137508A
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South Korea
Prior art keywords
larva
freshwater eel
feed
eel
survival rate
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KR20130057922A
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Korean (ko)
Inventor
이성호
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구골홀딩스 주식회사
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Priority to KR20130057922A priority Critical patent/KR20140137508A/en
Publication of KR20140137508A publication Critical patent/KR20140137508A/en

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    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01KANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K61/00Culture of aquatic animals
    • A01K61/10Culture of aquatic animals of fish
    • 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 present invention relates to a method for increasing the survival rate and growth rate of a larva of a freshwater eel (Leptocephalus), wherein the method uses, as the main ingredient of a feed, the eggs of a species of fish (representatively Seriola quinqueradiata) being collected in the original habitat of a larva of a freshwater eel with respect to the larva of the freshwater eel being cultivated in a cultivation water tank in order to increase the survival rate and growth rate of the relevant larva, thereby allowing the production of artificial seeds and the mass cultivation. According to a preferable embodiment of the present invention, with regard to the method for increasing the survival rate and growth rate of the larva of the freshwater eel, a feed including an egg substance of Seriola quinqueradiata is supplied to the larva of the freshwater eel in order to improve the survival rate and growth rate of the larva of the freshwater eel when Leptocephalus which is the relevant larva is contained and cultivated in a cultivation water tank. In addition, the eggs of Seriola quinqueradiata in the present invention are collected during the period from a vitellogenesis phase to an ovulatory phase.

Description

METHOD FOR PROVIDING ENHANCED SURVIVAL AND GROWTH OF LEPTOCEPHALUS [0002]
The present invention relates to a method for enhancing the survival rate and growth rate of eptocephalus, and more particularly, to a method for enhancing the survival rate and growth rate of hatching larvae or young fishes grown in eggs spawned by natural or artificial insemination from freshwater eel And to prolong survival, thereby promoting the survival rate and growth rate of freshwater eel larvae to obtain cultured broodstock for fry and mass culture as race seedlings.
It is generally known that the Far East freshwater eels, which are distributed in East Asia including Korea, hatch in the deep sea of the Pacific (to the present, the western coast of the Mariana Islands in South Pacific) (Eel of a freshwater eel or a fish) in the direction of the northward current along the ocean current, and then move northward along the Kuroshio Current. While reaching the coast, the eels (freshwater eel) And the eels are gathered in the estuary and grow as rivers, rivers or reservoirs, and then migrate back to the deep-sea area of the Pacific for spawning.
According to such ecological characteristics of freshwater eels, it is known that during the movement of the fish in the form of Preleptocephalus immediately after hatching, there is a possibility that leptosepalus (so-called freshwater eel Or eagle), and when it arrives to the coast, it is transformed into a "eel", a cheer, and is transformed into a river, a river, or a reservoir.
Conventionally, freshwater eel culture is a high-value-added industry that captures eel eels that migrate to transform into rivers, streams or reservoirs in the form of leptosepalus, and grow into sexual horns. However, due to the influence of natural environmental changes The number of eel eggs that migrate to the estuary is gradually decreasing. As a result, the price of the eels is gradually increased and the supply of eels is less than the demand of the eels. If the decrease in the catch of the fry is further increased Resulting in a significant adverse impact throughout the industry.
For this reason, in recent years, attempts have been made to establish a complete aquaculture system in which eggs are artificially hatched from a sibling and transformed into a fry via a serpentine (Leptosepalus), and the fry is grown into a sperm, Pretreptosepalus immediately after hatching starts egg yolk as a nutrient source, and when approximately 8 to 9 days have elapsed from hatching, it initiates dietary activity. However, until now, in the natural environment, Not only is the process of transformation to the fry not exactly known, but also the condition of the hatching of the freshly hatched freshwater eel.
Therefore, if the freshwater eel does not supply the preferred diet of the eel as a proper amount of timely and timely feed, it may be brought into a state of being in a non-feeding state in the freshwater eel fish, In order to breed freshwater eel (Leptosepalus), there is a plan to feed the shark (especially, the shark), and in recent years, shark (shark) Material is necessary.
In addition, if the growth period of freshwater eel fish is not minimized, the period for mass culture will be prolonged, which will be economically disadvantageous. Therefore, the period in which freshwater eel fish is transformed into eels (naturally, about 6 Month), it is essential to develop a diet favored by freshwater eel jacobs in order to increase the possibility of production of high quality artificial seedlings.
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances of the prior art, and it is an object of the present invention to provide a method and apparatus for detecting a fish species (typically, a defensive fish) living within the range of ocean currents of freshwater eel (i.e., leptosepalus) The object of the present invention is to provide a method for enhancing the survival rate and growth rate of freshwater eel larvae to improve the growth rate and survival rate of the frog without using the yolk of the shark by feeding the diets containing the main ingredient.
In order to achieve the above object, according to a preferred embodiment of the present invention, there is provided a method of receiving a Leptocephalus of a freshwater eel in a aquaculture tank and culturing the freshwater eel, There is provided a method for increasing the survival rate and growth rate of freshwater eel herring which is adapted to feed a feed containing the contents of fish eggs of defense as a fish species inhabited in the course of reaching the coast after hatching.
According to the present invention, the egg of the defecation is collected between the egg yolk forming unit and the ovulatory unit.
According to the method for enhancing the survival rate and growth rate of freshwater eel herb according to the present invention, the freshwater eel's reptosa plantarum is inhabited within the range of ocean currents migrating to the coast after hatching (that is, the northward current and the Kuroshio current) As a representative fish species, it is possible to raise the survival rate by making breeding friendly to the habitat environment of the corresponding fish as the risk of death due to nonsuperfication is reduced by collecting the defensive fish and preparing and feeding the fish (feed).
In addition, in the present invention, it is possible to substitute for the egg yolk of the shark which is limited in the catch because the fish is harvested using the natural and natural acid-rich defenses, .
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a graph showing a comparison between the growth rate and the growth rate of freshwater eel larvae according to a preferred embodiment of the present invention and the elongation (or total length) of the larvae according to a contrasting method.
FIG. 2 is a graph showing a comparison between the height of a living fish and the height of a living fish according to a contrasting method, according to a preferred embodiment of the present invention.
FIG. 3 is a graph showing the survival rate of the larvae according to the method of the present invention and the method of enhancing the survival rate and growth rate of the freshwater eel larvae according to a preferred embodiment of the present invention.
Hereinafter, preferred embodiments of the present invention will be described in detail.
First, according to a preferred embodiment of the present invention, it is possible to feed a freshwater eel (leaven) eel, leptosepalus, during a period from the intake of a dietary meal to a eel (chew) It is noted that the transformation to the eel is shortened compared to the natural environment.
Indeed, under natural conditions, the freshwater eel's larvae are maintained in the form of leptocaprozil for approximately 6 months from hatching to migration along the boreal currents and Kuroshio Currents and transformation from coast to eel.
Therefore, it is possible to improve the survival rate and the growth rate through the diet preferred by the leptociphilus, which is the eel of the freshwater eel (eel), and ultimately to produce artificial seeds (fry) for mass culture and / It is preferable to shorten it.
According to a preferred embodiment of the present invention, the initial diet of freshwater eel (Leptosepalus) is noted as a typical defense line. In general, the defense is a type of defense from the middle layer to the deep- It is easy to get egg because it sprays fertilization egg of wild mountain under any condition of wild and cultured fish, and it becomes advantageous as the initial diet of freshwater eel fish.
In general, fish eggs consist of eggshell membranes and contents inside the oviduct. When ovarian cells terminate the proliferative phase of ovarian cells, oocytes become oviducts and accumulation of egg yolk or egg yolk begins. It grows through the growth phase and accumulates in the ovary until it is released into the body by ovulation.
Here, in order to use it as a dietary material, egg yolk content, which is a stage prior to egg development, is used from egg-maturing period rich in nutrients, and egg yolk containing nutritional components such as protein is accumulated. After one egg yolk forming period is preferable for use as a diet.
According to the present invention, the eggs are obtained by extracting the ovaries from natural or aquaculture defenses, and the fish eggs may be any of salted eggs, frozen eggs, liquid eggs, and powder eggs.
In the case of producing diets (diets) using the defensive column, they can be mixed with other diets as they are, but in order to maintain the uniformity of the diets and to always produce diets (diets) of the same quality, It is more advantageous to prepare the feed by mixing the other ingredients with other feed ingredients.
According to the present invention, the dietary feed (feed) according to the present invention may be prepared by using the added water (added water) suitable for the contents of the raw or the contents of the raw fish or the raw materials used for the freshwater eel However, it is not preferable to add a component that inhibits the growth of the freshwater eel's eardrids. Examples of ingredients that inhibit the growth of the eel include fish egg poison such as phytic acid or Lectin, .
The dietary (feed) according to the present invention may be used alone or in combination with other ingredients including a vitamin mixture, ascorbic acid (C 6 H 8 O 6 ), and krill shrimp lysate .
In order to make the freshwater eel hare easy to eat in the breeding tank in the breeding water tank, the feed of the present invention should contain 6 to 40% by weight, preferably 10 to 30% by weight, more preferably 10 to 30% Is preferably in the range of 15 to 25% by weight.
According to the embodiment in which the survival rate and the growth rate of the freshwater eel larvae were tested using the diet (feed) according to the present invention, about 300 horses on the 7th day of hatching were divided into 2 groups of 10 liters (preferably, And each was dispersed and received.
Here, in one trough, the feed containing the main ingredient of the defensive column according to the present invention is fed, and the other trough is fed with a feed containing the main ingredient of the yolk of a shark, and the survival rate and growth rate I was prepared.
That is, according to the present invention, feeds corresponding to the respective tanks were fed from the eighth day after the hatching, and the number of feeding times was 3 times a day, the temperature of the raising water was 24 ° C, And the growth and survival were evaluated by measuring the number of survivors, height, and body height.
According to the present invention, the same amount of distilled water was added to the ovaries of each species and crushed, followed by screening with a mesh filter having a size of 400 mu m, filtering with a 100 mu m filter net to remove the egg shell components, The components were lyophilized and powdered to prepare ovary powder as a feed material.
First, in the defensive column according to the present invention, the feed (feed 1) using the ovary powder is prepared by mixing 77 g of distilled water, 0.55 g of a vitamin mixture, 0.069 g of ascorbic acid.
On the other hand, the feed (feed 2) based on the ovary powder of the shark (eggplant) was 51.3 g of egg yolk. 5.1 g of decomposed krill, 43.6 g of distilled water, 0.85 g of a vitamin mixture and 0.10 g of ascorbic acid.
Feed 1 and feed 2 were fed from the 8th day of hatching, and the survival rate and the standard deviation and standard deviation of elongation and body weight of the freshly-grown individuals were measured at day 20 from the day of rearing, Respectively.
 Height mm (means ± SD)   Height mm (means ± SD)    Survival rate (%)
 Start breeding      6.87 ± 0.10      0.61 + 0.03
 Feed 1      8.39 ± 0.57      0.69 ± 0.06        55.4
 Fodder 2      8.21 + - 0.64      0.67 + 0.11        37
Feed 1 and feed 2 described above were fed from the eighth day after hatching, and the survival rate and the standard deviation and the standard deviation of elongation and body weight of the freshly harvested 30 days after the date of rearing were measured. 2).
 Height mm (means ± SD)   Height mm (means ± SD)    Survival rate (%)
 Feed 1      9.45 ± 0.72      0.86 ± 0.10        26.3
 Fodder 2      9.37 ± 0.83      0.81 + 0.13        13.7
According to the above Tables 1 and 2, it can be seen that the feed rate of the feed 1 according to the present invention is higher than that of the feed 2, and the growth rate is also higher.
Next, using the above-mentioned Feed 1 and Feed 2, the growth from the hatching day to the 50th day was compared with that of the fresh hatching. The height, height, and survival rate of the hatching were measured after the hatching, 20, 30, 40, and 50 days. FIG. 1 is a graph comparing the elongation, FIG. 2 is a graph comparing the height, and FIG. 3 is a graph showing the survival rate.
According to FIG. 1 and FIG. 2, the height and height were almost equal during the rearing period, and according to FIG. 3, the survival rate was higher in the rearing period than in the case of the rearing period .
The present invention is not limited to the above-described embodiments, and various modifications and changes may be made without departing from the spirit and scope of the invention.
In the case of the defense assumed in the present invention, it is a typical fish species inhabiting on the path of the freshwater eel's hare, leptosepalus, which migrates to the coast after hatching. In the present invention, it is not limited to the fish species, And / or species that live in the range of Kuroshio Currents.

Claims (2)

  1. In the method of receiving the Leptocephalus of freshwater eel (eel) in aquaculture tank,
    A method for enhancing the survival rate and growth rate of freshwater eel larvae, comprising feeding the feed including the contents of the defensive fish to improve the survival rate and growth rate of the fish.
  2. [2] The method of claim 1, wherein the defensive fish egg is harvested from an egg yolk forming unit during an ovulation period.
KR20130057922A 2013-05-22 2013-05-22 Method for providing enhanced survival and growth of leptocephalus KR20140137508A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105248326A (en) * 2015-10-22 2016-01-20 全椒县花溪湖特种水产合作社 Excellent eel culturing method
CN106234276A (en) * 2016-08-30 2016-12-21 苏州市阳澄湖三家村蟹业有限公司 A kind of flowing water culture method of Anguillar japonica
KR101704970B1 (en) 2016-05-20 2017-02-09 구골홀딩스 주식회사 Eel nursery device
CN108112509A (en) * 2018-01-16 2018-06-05 仙桃市洪渊泽水产养殖专业合作社 A kind of method that there is native Ecology breeding swamp eel seedling in rice field

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105248326A (en) * 2015-10-22 2016-01-20 全椒县花溪湖特种水产合作社 Excellent eel culturing method
KR101704970B1 (en) 2016-05-20 2017-02-09 구골홀딩스 주식회사 Eel nursery device
CN106234276A (en) * 2016-08-30 2016-12-21 苏州市阳澄湖三家村蟹业有限公司 A kind of flowing water culture method of Anguillar japonica
CN108112509A (en) * 2018-01-16 2018-06-05 仙桃市洪渊泽水产养殖专业合作社 A kind of method that there is native Ecology breeding swamp eel seedling in rice field

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