KR101489660B1 - METHOD FOR CULTUERING CATADROMOUS FISH(Anguilla marmorata) BY USING RECIRCULATING AQUACULTUER SYSTEM AND SEAWATER ACCLIMATION - Google Patents

Abstract

The present invention relates to aquaculture method, and more particularly, to a method of producing a descending fish by circulating filtration method and stepwise seawater sequestration so as to have excellent meat quality, taste and color using specific ecological and physiological characteristics of descending fish will be.
The first aspect of the present invention is directed to a method for growing a descending fish including a step of transporting a fish 100, a step 200 for raising a fish, and a step 300, wherein a water- And allowing the descending fish to move in the opposite direction of the water flow and allowing the descending fish to flow without feeding for 30 to 40 days.
According to the present invention, it is possible to produce descending fishes including intact eel according to consumers' preference by making the taste and color of the fish unadulterated without feeding the fish in the stepwise seawater settlement, and bringing the taste and color close to the natural acid. In addition, since the circulation filtration system is adopted for the aquaculture, the water quality can be improved by efficiently removing the excrement materials, feces, ammonia, and nitrite, which are problematic in fish farms, And can contribute to reducing farmers' operating costs and maximizing consumer acceptance by reducing the excessive feeding and abuse of antibiotics by farmers.

Description

TECHNICAL FIELD The present invention relates to a method for forming a descending eel (eel-eel) through recirculating filtration and sequential seawater sequencing,

The present invention relates to a method of breeding, and more particularly, to a method of breeding a fish using a recirculating filtration system and a stepwise seawater equilibrium so as to have excellent meat quality, taste, and color using specific ecological and physiological characteristics of a descending fish, And particularly relates to a method of cultivation of indigo eel.

The fish that can be cultured by using the osmotic pressure control ability are eel and salmon, and the salmon is a so-called fish which is born in freshwater and migrates to sea water and then returns to the place where it was born for spawning. The eel eel that can be eel is eel fish, which is opposite to salmon, is called as a descendant fish, which spawns in the sea and hatches back to the river and grows back to the sea.

In the case of freshwater fish, the body fluid is more salty than the environmental water, and the water penetrates into the body continuously through the gills, the digestive tract, and the epidermis. In order to maintain a proper amount of water in the body, dilute urine is produced in the kidney, and a large amount of it is released to the outside of the body to maintain the moisture in the body. At this time, univalent ions such as Na + released from the urine are absorbed in the tissue epithelium And the salts contained in food and the like are absorbed by intestinal epithelial cells. In addition, there is freshwater type salt cells on the new side of the gill, which absorbs the salts by the action of the proton ATPase enzyme on the vacuole to maintain the salinity of the body fluid.

In the case of sea water fish, since the body fluid is lower in salinity than the environmental water, a large amount of seawater is introduced into the body to absorb the moisture in the intestine to prevent physiological dehydration. Excessive Na + + monovalent ions are excreted through seaweed salivary glands of the gill slits and urine is excreted in a very small amount to maintain the body's osmotic pressure.

As described above, the osmotic pressure regulating functions of seawater fish and freshwater fish are opposite to each other because the kinds of saline cells of the gills and the roles of metabolic systems are different from each other. The seawater and fresh water The migratory fishes such as ascending and descending fishes that migrate and migrate are activated or deactivated by the salivary gland cells of the new gill according to the change of the environmental water such as fresh water and seawater so that the function of the metabolic system in the body is changed, It has ability.

However, the above-mentioned osmotic pressure control is not performed within a short time. Instead, it is maintained for smooth adaptation according to the salinity change in the nodal zone where the fresh water and the sea water are combined when the regenerative fish and the underwater fish go through the river and the sea. It will enter into seawater or fresh water.

On the other hand, the drop in fish sex giant mottled eel Anguilla is its scientific name marmorata is a tropical fish species belonging to the Anguillidae of the eel family. It is a rare species on the Korean Peninsula, but very few species are found in Gyeongsang Province, Jeolla Province and Jeju Island. In China (southern), Taiwan and Japan (southern) · It is often found in the Philippines and Indonesia. The head eel ( Anguilla japonica ), the length from the origin of the pectoral fin to the tip of the mouth is shorter than the length from the origin of the dorsal fin to the origin of the dorsal fin, the body background is yellowish brown or black brown, the stomach is white, There are scattered planes.

Indigenous eels live mainly in rivers with relatively high yields and are predatory to carnivores, so they eat various fish, shellfish and crustaceans at random. It is a tropical fish, known to come north along the turbulence in Korea. Spawning season and spawning place are not known, and larvae are in the Leptocephalus period. Objects with body lengths of 60 to 120 cm are common, and those over 200 cm are rarely found. In Korea, the endangered eel species itself has been designated as a National Monument No. 258, and the habitat of the Cheonjiyeon Waterfall in Seohong-dong, Seogwipo City, Jeju Province is designated as Natural Monument No. 27.

Korean Patent No. 820041 suggests "a method of culturing fish using osmotic pressure control ability" at present, and it is necessary to provide a method of producing fish using the osmotic pressure control capability. The present invention relates to a method for growing a fish having a predetermined size by hatching an egg of a fish, A seawater adaptation step of moving the fish having undergone the hatched growth step into the aquaculture water tank and gradually increasing the salinity of the water in the aquaculture tank so as to be able to survive at a salinity corresponding to the seawater; And a shipment step of shipment of the fish through the seawater adaptation step. In the seawater adaptation step, the salinity of the water in the aquaculture tank is adjusted to be 3.4 times per hour at a selected time interval within a range of 7 hours to 60 hours Wherein the salt is increased to 34 times the final salinity over 10 steps to adapt the fish to survival at the salinity corresponding to the seawater. However, if the salinity is raised periodically by 3.4 per milliliter (‰) as in Korean Patent No. 820041, many cheerleaders can not adapt to the changed situation and there is a problem in that they are extinguished.

Korean Patent Laid-Open Publication No. 2009-111066, on the other hand, discloses a method for leveling sturgeon, comprising the steps of: i) Seawater fertilization step; Ii) seeding the seawater at a temperature of 15 ‰ or lower for 48 hours; And iii) a step of seawater fermentation including the step of seawater fermentation for 48 hours under 22.5 ‰ of salinity. However, this technique does not have the desired effect on the compliance of the fry without regard to the difference in salinity and temperature.

Korean Patent Publication No. 2004-105908 discloses "Rotifer Strain No. 1 of the National Fisheries Research and Development Institute" and its method for pure sea water culture. More specifically, the present invention relates to a method for culturing rotifers collected from nodules in 2-4 to 9 ppt After culturing in diatomaceous earth, the culture salinity concentration was raised within the range of 5-10% of the pre-culturing salinity concentration every 2 ~ 5 days, so that the final salinity was 32 ~ 34 ppt, then transferred to seawater and cultured , Which is a technique related to the seawater flow of a rotifer strain which is a zooplankton as a fish feed which can not be applied to a descending fish, and can not be applied to the formation of a descending fish, There is still a problem that the salinity increase is not discontinuous and the efficiency of the culture of the descending fish can not be increased.

The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a method and apparatus for producing low-grade fishes, especially endemic eels, at a constant flow rate in seawater, In particular, to provide a method of transporting fishes of descendant fishes, a method of breeding using a circulation filtration device, and a method of delivering seawater suitable for descending fishes.

However, the problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, a first aspect of the present invention is a method for an eel-eel aquaculture including a step of transporting a fish, a step of raising a fish, and a step of raising a fish, A step of cultivating the eel in the opposite direction of the water flow and allowing the eels to flow without feeding for 30 to 40 days.

In one embodiment of the present invention, in the step of performing the above-mentioned step, the sexually transmitted male fish raised in the step of breeding the fish are put into a plain water tank having a salinity of 4 to 6 percents and a water temperature of 27 to 31 ° C for 42 to 54 hours, Maintaining a feed rate; The method according to any one of claims 1 to 3, wherein the natural seawater is introduced into the equilibrium water tank at a flow rate of 0.8 to 1.2 ton / h, and the fluid is discharged at a flow rate of 0.8 to 1.2 ton / And a second seawater fertilization step of continuing the feeding, but the present invention is not limited thereto.

In one embodiment of the present invention, in the step of transporting the fish, the fish of the descending fish is sampled in fresh water, and then the fish is packed in a plastic bag filled with water at 15 to 25 ° C. Then, oxygen gas is injected into the bag, But it is not limited thereto.

In one embodiment of the present invention, the breeding step or the fertilization step uses a circulation-type breeding tank that receives oxygen from the oxygen supply unit and receives air from the air injection unit, and includes a drum filter and a biological filtration tank But are not limited thereto.

In one embodiment of the present invention, the breeding step includes using a circulation-type breeding tank that receives oxygen from an oxygen supply unit, receives air from an air injection unit, and includes a drum filter and a biological filtration tank, After the fermentation was carried out in an atmosphere of 4 ~ 6 salinity, 15 ~ 25 ℃ in water temperature and 5 ~ 10 ppm dissolved oxygen, the transferred fish were stored at 5 ~ 7 ℃ for 1 ~ A 31 ° C atmosphere for making the poultry breeding tank; And feeding the fry in the breeding tank twice a day to breed the fry for 1.5 to 2.5 months, but the present invention is not limited thereto.

In one embodiment of the present application, the descending fish may be intact eel, but is not limited thereto.

According to the present invention, it is possible to produce descending fishes including intact eel according to consumers' preference by making the taste and color of the fish unadulterated without feeding the fish in the stepwise seawater settlement, and bringing the taste and color close to the natural acid.

In addition, since the circulation filtration system is adopted for the aquaculture, the water quality can be improved by efficiently removing dissolved substances such as excreta, frozen food, ammonia, and nitrite, which are problematic in fish farms. And can contribute to reducing farmers' operating costs and maximizing consumer acceptance by reducing the excessive feeding and abuse of antibiotics by farmers.

Figure 1 is a block diagram of a method of forming a descending fish in one embodiment of the present invention
FIG. 2 (a) is a perspective view of a circulation filtration type feeding system for using a circulation filtration system in one embodiment of the present invention
2 (b) is a conceptual diagram of FIG. 2 (a)
Figure 3 is a block diagram of a method of form including stepwise seawater permutation, in one embodiment of the present invention.
FIG. 4 is a block diagram of a form method including, in one embodiment of the present application, including cheat transport,

Hereinafter, embodiments and examples of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention.

It should be understood, however, that the present invention may be embodied in many different forms and is not limited to the embodiments and examples described herein.

Throughout this specification, when an element is referred to as " including " an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise.

Throughout this specification, when a step is said to be "on" or "before" another step, this means that not only when a step is in a direct time-series relationship with another step, The same order of magnitude as in the case of an indirect temporal relationship in which the order of steps is reversible.

The terms " about "," substantially ", etc. used to the extent that they are used throughout the specification are used in their numerical value or in close proximity to the numerical values when the manufacturing and material tolerances inherent in the meanings mentioned are presented, To prevent unauthorized exploitation by an unscrupulous infringer of precisely or absolutely stated disclosures to help. The term " step " or " step of ~ " used throughout the specification does not mean " step for.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a block diagram of a method of forming a descending fish in one embodiment of the present invention. 1, a first aspect of the present invention is directed to a method for growing a descending fish comprising a step 100 for transporting a fish, a step 200 for cultivating a fish, and a step 300, Characterized in that the method comprises a step of cultivating the fish by using a submersible motor in the fish to cause the fish to move in the reverse direction of the water flow and allowing the fish to flow without feed for 30 to 40 days. You can provide a method of form.

The method of transporting ordinary fry is to transport the frypot to airports or trucks using an insulating box or a container. The frying stage of the fry here is to maintain the temperature well in order to adapt to the environment of the fresh fry before the transfer. The fry of the descending fish is transported to the freshwater poultry, and the poultry is transported to the poultry tank. More specifically, in one embodiment of the present invention, , Filling the bag with water at a temperature of 15 to 25 캜, filling the plastic bag with oxygen gas, sealing the bag, and transferring the bag to the breeding tank (frying and sealing step), but the present invention is not limited thereto .

In this manner, in the above step, the fry is transported in fresh water and then packed in a plastic bag filled with water at 15 to 25 ° C. Then, oxygen gas is injected into the plastic bag and the bag is sealed and transported. The stress and mortality due to the environmental changes of the fry during the coarse buffering step can be drastically reduced. In detail, the fishes in the sea, the nose area or the fresh water, which are in contact with the land, are placed in fresh water, and then a plastic bag of 0.03 mm, 40 cm long and 70 cm long is filled with 3-4 liters of water (Preferably 15 to 25 ° C), and then a high concentration of gaseous oxygen is injected into the extra space after holding about 1 kg of the fry, and the dissolved oxygen amount is maintained at 8 to 12 mg / Tightly. In order to keep the temperature constant, packed ice packs are stacked in newspapers, packed in boxes, sealed with lids, transported and transported to the breeding tank, and the values of the temperature and dissolved oxygen This can drastically reduce the stress and mortality caused by transporting and transporting the fry within the range.

The step of raising the fry 200 is a step of raising the fry in an adult fish. In one embodiment of the present invention, the atmosphere of the fish breeding tank is an atmosphere having a salinity of 4 to 6, a water temperature of 15 to 25 ° C and a dissolved oxygen amount of 5 to 10 ppm (See 210 in FIG. 4), which is carried out at a temperature of 27 ° C to 31 ° C by raising 1 ° C per 5 to 7 hours after stocking the transferred eels. And a feeding step (refer to 220 in FIG. 4) in which the fry is fed twice a day in the breeding tank to breed the fry for 1.5 to 2.5 months (see 220 in FIG. 4).

More specifically, the above described buffering step (refer to 210 in FIG. 4) of the above-described poultry breeding buffer (refer to 210 in FIG. 4) comprises a circular PP water tank having a diameter of about 6 m and a height of 1.2 m and having a depth of 30 cm, a salinity of 4 to 6 percents, The air produced by the air blower and the pure oxygen are mixed and injected through the oxygen supply device installed in the water tank to form an atmosphere having a dissolved oxygen amount of 5 to 10 ppm. After adjusting the temperature, salinity and dissolved oxygen of the tank, put the 10kg / tank of the fish that has been transported by air or vehicle in the tank for 30 ~ 60 minutes in the water tank to make it equal to the water temperature in the water tank, It is preferable to raise the temperature by 1 DEG C per 5 to 7 hours to stabilize the atmosphere at 27 to 31 DEG C. [ The feeding step (refer to 220 in FIG. 4) is fed twice a day, preferably in the morning and evening, and converted into 1.5 to 2.5 Months. After approximately 2 to 2.5 months, mature eelfish can be divided into the same size and cultured, but this is not restrictive.

The above-mentioned breeding step of the present invention is characterized in that it is subjected to a step of buffering the breeding hatching so as to limit the fatal rate of the sensitive fry to a very low level, and in connection with the step of feeding. In addition, the salinity value of the fish breeding stage of the present invention was kept constant at 4 to 6 times, and the temperature was raised by 1 ° C per 5 to 7 hours to form an atmosphere of 27 to 31 ° C. In this numerical range, it is possible to solve the problem of the mortality rate of the fry in the state where the change of the salinity is discontinuous or the salinity of the salinity is less than 4 percents or the salinity of the salinity is maintained more than 6 percents have.

This is because it is advantageous to cultivate the fish as a sexually active fish by using the temperature and the numerical value of the rearing stage of the fish according to the homeostasis of the eel fish.

In the meantime, the circulation filtration method can be used for the water tank for breeding or homing in the breeding step or the moving step.

FIG. 2 (a) is a perspective view of a circulation filtration type feeding tank for using circulation filtration in one embodiment of the present invention, and FIG. 2 (b) is a conceptual view of FIG. 1 and 2, the breeding step (200) or step (300) includes receiving oxygen from the oxygen supply unit (510), receiving air from the air injection unit (520) But is not limited to, using a circulatory filtration tank 500 including a filter 530 and a biological filtration tank 540, and rearing or cultivating the animal.

In the circulation filtration method, the water is filtered through the drum filter 530, the water is filtered through the biological filtration tank 540 and sent to the breeding tank 500, It is always possible to grow in a good environment. This method can be cultivated at a very high density compared with the exponential method and the furnace method, and it is very economical. In Korea, where the four seasons are distinct, the temperature is maintained at a constant temperature (maintained at 28 ° C) It is very useful to filter and recycle the breeding water.

Oxygen which requires intensive eel is dissolved in oxygen supply unit 510 through a dissolver (vaporizer) in order to reduce the loss of oxygen using liquefied oxygen and supplied to the breeding water. The air injection unit 520 serves to send air to the water tank and the biological filtration tank, and the air supplied to the biological filtration tank is used to remove the nitric oxide and other contaminants from the biological filtration tank.

The biological filtration tank (540) treats toxic dissolved substances such as ammonia and nitrous acid, which remain in the water after the feed and the like are removed by the drum filter, from the excrement and the juice generated by the fish in the water tank, Bacteria are treated to discharge the water in the tank to the outside to remove the cause of environmental pollution at a time and to provide the effect of reducing the cost of the aquaculture. On the other hand, if necessary, a heating device of the boiler may be added, but the heat of the biofilter may be recovered using a heat exchanger and supplied to the water tank, and an ultraviolet disinfector in the biofilter may be additionally used. .

After the breeding of the fry using the circulation filtration method or the circulating filtration apparatus as shown in FIG. 2, the selection is made about 50 days before and after the sale, If it is more than 300 g / m3, it moves to the sea water tank.

1, the method of the present invention includes generating a water flow using a submersible motor attached to a venturi in an equilibrium water tank, thereby causing the descending fish to move in the reverse direction of the water flow, And a step of cultivating the seedlings without feeding the seedlings (step 330).

In detail, a venturi (foam oxygen feeder) is attached to an underwater motor of about 0.5 horsepower (hp) in order to maintain a constant flow rate in the breeding water composed of complete seawater, and one underwater motor is put into the breeding tank. This can produce a double effect in which the steady eels continuously move in the opposite direction of the water flow by generating water flow continuously and the fat is decomposed and the meat quality is improved. With the above technique, the feed is maintained for about 30 to 40 days, preferably about 31 to 35 days, without feeding.

The natural cultivation step 330 can be performed through the circulation filtration method or the circulation filtration apparatus shown in FIG. 2, and the natural monument 258, which has not been cultivated in Korea, Although it has succeeded in culturing in freshwater, it can solve the problem that its taste and meat quality are not satisfying consumers' palatability due to the marginal characteristic of cultured.

In this study, the fish meat quality was improved by the natural fermentation for 30 ~ 40 days at a constant flow rate to the seawater without feeding the feed for a certain period of time by using the physiological and ecological habits of the eel fish, especially during the shipment of the submerged fish, And some fat is decomposed due to the influence of feed - free diet, protein content is further increased, and the sensation felt in the eel is significantly reduced, which is significant for improving the palatability.

It is preferable that the initial cultivation step 330 is performed after the stepwise seawater settlement described below. FIG. 3 is a block diagram of a method of performing a method comprising stepwise seawater permutation in one embodiment of the present invention. Referring to FIG. 3, in one embodiment of the present invention, Before the breeding step (330), the adult fishes raised in the breeding stage (200) were stocked in a plain water tank having a salinity of 4 to 6 percents and a water temperature of 27 to 31 ° C, and the first sea water Step 310; The method according to any one of claims 1 to 3, wherein the natural seawater is introduced into the equilibrium water tank at a flow rate of 0.8 to 1.2 ton / h, and the fluid is discharged at a flow rate of 0.8 to 1.2 ton / And a second seawater smoothing step 320 in which the saline is continued. However, the present invention is not limited thereto.

As an embodiment of the first seawater flooding step 310, a seawater mixed water having a salinity of 4 to 6 ‰ and a water temperature of 27 to 31 째 C is prepared in a circulating water tank of about 8 m before stocking the eel eel fish . 4 ~ 6 ‰ salinity salted fish in a water tank to stock up about 42 ~ 54 hours. After incubation, additional heating facilities are unnecessary. It is to gradually adapt to the natural sea water temperature. This makes a significant contribution to saving fuel costs for additional warming for about 45 days. Natural seawater does not freeze during the winter season.

As an example of the second seawater flooding step 320, about 0.8 to 1.2 tons per hour is continuously sprayed while maintaining a depth of 1m in a circular water tank having a diameter of 8m (50 tons of water: πr²h = 3.14 × 4m² × 1m) . This is because a large number of breeding water is secured compared to the 5m round water tank, and more and more eels can be efficiently sorted. In this way, if the natural seawater is sprayed continuously, it takes about 10 days since the seawater continuously flows in and out before the transfer of the whole stock is completed.

The salinity and temperature values of the first and second seawater phases of the first and second seawater phases are determined according to the specific ecological and physiological characteristics of the freshwater eel, which hatches from the sea, grows in the river, It is meaningful to limit the numerical value in terms of being able to adapt to the palatability of the consumer because it can have meat, taste,

FIG. 4 is a block diagram of a frying method including a fry transfer, a fry breeding buffering step, and the like in one embodiment of the present invention. As shown in FIG. 4, Can be taken into consideration together with the above-mentioned smoothing step.

As described above, the determining step may be composed of the initial seawater flooding step of the initial stage, the second seawater flooding stage of the middle stage, and the genuine growing stage. The initial stage is about 2 days (preferably 42 to 54 hours) (Preferably 9 to 11 days) and the breeding period is about 33 days (preferably 30 to 40 days), and the sea water freezing technique is about 45 days (preferably 41 to 53 days).

Hereinafter, embodiments of the present invention will be described in more detail so that those skilled in the art will be able to easily and repeatedly carry out the present invention.

Circulation filtration Breeding  Breeding

6m Circular PP water tank 22, 5m round PP water tank 6, width 3.5m, length 7m, height 3m Biological filtration 18, drum filter 3, air injection part blower 30HP 2, 10HP 2, 5HP 2, boiler 200,000 grazing eels were kept at 28 ℃ and dissolved oxygen level was maintained at 7㎎ / ℓ or higher by using a circulation filtration tank composed of facilities, liquefied oxygen facilities and dissolving facilities. The animals were fed two times a day and kept for about 2 months.

Tantalizing Seawater settlement  Preservation

The seawater was sampled for about 45 days by using the circulating filtration technique of Example 1, using an average weight of 300 g and an average length of 45.5 cm.

In detail, after raising the salinity to 5 percents, the feed is fed for about 2 days, and the water is continuously sprayed about 1 ton into the rearing tank (control tank) by controlling the amount of fresh water and natural water. And the unpaid amount was determined for about 10 days.

In the breeding facility, 3 freshwater oyster cultivars (5 m) were used to conduct seawater selection. During the seawater expiration, no payday was given without feed grade, and seawater farming was adopted.

In order to dilute freshwater and seawater in the mixing tank, aeration with 16 air stones was continuously carried out. One underwater motor was installed in the breeding tank to circulate the water in the water tank at a constant flow rate. During the day, the liquid was pumped, and liquefied oxygen was injected to keep the dissolved oxygen amount at 8 mg / l or more.

< Test Example  1> Comparison of obesity index and mortality rate

The experiment was carried out for 45 days using a total of 5,000 fishes of 1,000 eelings having an average weight of 300 g and an average length of 45.5 cm among the eels prepared according to Example 2 above. Obesity and mortality were compared in Table 1.

The following Comparative Examples 1 to 4 are indefinite eel in a state where no feed is not fed for 30 to 40 days in a transitional state of intonation, It is a steady - state eel with the form of applying the buffering step of the fish breeding group in the state where the feed - free feeding and the stepwise permutation process have not been carried out.

As shown in [Table 1], the weight of the freshwater eel that was unpolluted according to the present invention was lower than that of the freshwater eel (freshwater and feedwater) cultured under different conditions, but the color and vitality were superior to those of normal cultured Total mortality rate was significantly lower.

In addition, it was found that the total yield was better than that in the case of excluding the feeding amount of feed, rather than the unpaid feed for a certain period of time.

Kinds Length (cm) Weight (g) Total mortality (%) Total production (kg) Example 2 46.0 273 15.0 232.1 Comparative Example 1 47.5 351 30.5 243.9 Comparative Example 2 48.4 374 19.3 301.8 Comparative Example 3 47.2 362 25.5 269.7 Comparative Example 4 46.9 363 23.5 277.7

< Test Example  2> Sensory evaluation

The sensory evaluation was carried out in a non-explanatory manner using no-positive conditions using the intact eel prepared by the above Example 2. As a result, 30 adult male and female tourists were selected. In addition, the sample did not contain any seasonings or salt for accurate sensory evaluation.

The comparative degree is 5: very good, 4: good, 3: fair, 2: poor, 1: very bad, and the average value is summarized in Table 2 below.

Kinds flavor Flesh condition Example 2 4.5 4.7 Comparative Example 1 3.4 3.3 Comparative Example 2 2.6 2.4 Comparative Example 3 2.5 2.4 Comparative Example 4 2.8 2.7

As a result of evaluation, the highest score was obtained in terms of taste and meat quality of Example 2 of the present invention. In addition, according to other opinions of the evaluators, it has been reported that the eel eel that is cultivated according to the method of Example 2 of the present invention is superior in meat-like chewing taste and flavor, and can not feel the flavor of sea flavor, .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It is evident that many variations are possible by those who have the.

100: Transferring the chew 200: Chewing
300: Routing Step 310: First Seawater Routing Step
320: second seawater smoothing step 330:
500: circulation filtration breeding tank 510: oxygen supply unit
520: air injection unit 530: drum filter
540: biological filtration tank

Claims (6)

A step of transporting a fish, a step of transporting a fish, a step of transporting a fish, a step of transporting a fish,
A step of generating a flow of water by using a submersible motor attached to a venturi in an equilibrium water tank so as to exercise the intestinal eels in a direction opposite to the flow of water and allowing the feedstock to flow without feeding for 30 to 40 days,
In the above-mentioned step, the sexually transmitted sexually transmitted fishes are raised in a saline water tank having a salinity of 4 to 6 percents and a water temperature of 27 to 31 ° C for 42 to 54 hours to maintain a feed- step; And
After the first seawater freezing step, natural sea water is introduced into the water tank at a flow rate of 0.8 to 1.2 ton / h, while the fluid in the water tank is discharged at a flow rate of 0.8 to 1.2 ton / h, And a second seawater injection step of continuing the second seawater injection step.
Indoor eel culture.
delete The method according to claim 1,
The step of transporting the fish includes the step of transporting the fish to the fish breeding tank by inserting oxygen gas into the plastic pack after storing the fish in the water packed with water at 15 to 25 ° C, However,
Indoor eel culture.
The method according to claim 1,
The step of raising or moving the step
Wherein the oxygen is supplied from an oxygen supply unit, the air is injected from an air injection unit, and a circulation type filtration tank including a drum filter and a biological filtration tank is used,
Indoor eel culture.
The method according to claim 1,
The above-
A circulation filtration tank containing a drum filter and a biological filtration tank is used, and the circulation filtration tank is divided into 4 ~ 6 salinity, 15 ~ 25 ° C and 5 to 10 ppm of dissolved oxygen, then feeding the transferred eels to the fish and raising the fish at 1 ° C for 5 to 7 hours to form an atmosphere of 27 to 31 ° C. And
A feeding step of feeding the fry in the breeding tank twice a day and raising the fry for 1.5 to 2.5 months.
Indoor eel culture. delete

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