KR20030075066A - A feed additive for cultured fish - Google Patents

Abstract

PURPOSE: A feed supplement containing high molecular weight chitosan and a salt thereof as an effective ingredient, together with photosynthetic bacteria, activated carbon and illite to double a physiological activity is provided. Therefore, it enhances the digestion and growth of fishes even at low temperature. CONSTITUTION: A feed supplement contains 0.01 to 3% by weight of high molecular weight chitosan having a molecular weight of 20,000 to 1,000,000 and a salt thereof, 5 to 15% by weight of photosynthetic bacteria, 10 to 20% by weight of activated carbon, 10 to 20% by weight of illite and 40 to 60% by weight of cereal bran. The photosynthetic bacteria are selected from the group consisting of Rhodopseudomonas palustris, Rhodopseudomonas spheroides, Lactobacillus paracasei, Candida valida and Streptomyces albus. The cereal bran is defatted bran, rice bran, oil cake or fish cake.

Description

A feed additive for cultured fish

The present invention relates to a feed additive for aquaculture fish, and more particularly, it contains polymer chitosan or its salt as an active ingredient, and induces prevention and treatment of various fish diseases occurring in aquaculture, and at the same time promotes the growth and immunity of fish. It relates to a feed additive for farmed fish having an enhancement function.

Fish diseases in farmed fish include Birna virus, Rhabdo virus, Lymphocytis virus, Herpes virus, Vibrio sp. There are various types, such as Streptococcus sp., Edwardsiella sp., Flexibacter sp., Vitiligo sp., Scutica sp.

In general, fish disease has a large number of infectious agents such as pathogens, and when there is a high chance of infection, when aquaculture fish have low immunity against pathogens, cultures such as digestive disorders and external wounds caused by overcrowded stress or ingestion of altered feed The deterioration of conditions is a major cause.

At present, the domestic aquaculture industry is from environmental factors caused by indiscriminate granulation of farms due to rapid quantitative expansion and deterioration of water pollution due to excessive use of various disinfectant disinfectants such as formalin and hydrogen peroxide, and from foreign countries such as flounder, dome and eel. In addition to high water temperature, sudden deaths occur throughout the year due to biological factors such as the introduction and emergence of germs caused by the introduction of new fish species (e.g., squaticosis) and the emergence of resistant bacteria due to the abuse of various antibiotics. The serious damage facing this bankruptcy continues.

Among them, the flatfish farming, which is a major aquatic industry in Korea, is responsible for the intestinal turbidity that occurs at the age of 20 days due to the contamination of bacterial diseases of early feeding organisms, and the scutica, which is parasitic in vitro and dead, in the fry (1-20cm) stage. It is known to cause an important disease.

Paralichthys Olivaceus is one of the seasonal diseases of fish. In February, the virus caused lymphocytic disease, a viral disease. Feeding is not possible, and the disease is increasing every year due to coastal pollution, and the flounder spreads rapidly due to the wetness of each other.

As the flounder seedling grows very fast around April, even if it is accepted at the proper density, it changes to a dense state within one month, so the density should be checked and dispersed frequently. In June, the water temperature rises to around 20 ° C, and growth is fast and important for sponges. At this time, the size of the fry is 15-20cm young, so it is susceptible to various diseases. In places where the algae are fast, there is a high probability of developing ulcer disease glide bacillus.

In addition, the most common diseases in June are Edward's disease and streptococcal disease. The incidence of Edward's disease is high in May-July and streptococcus in July-September. The cause of fish disease in the warm season is aging of fish caused by long-term crops, poor quality and water quality, overcrowded facilities and breeding, rancidity of feed, frequent stress, wounds, and other factors such as streptococcosis, ulcer disease, and viral diseases. Onset, and winter conditions from October to December are similar to the conditions of fish disease in July and August.

Currently, anti-inflammatory agents such as sulfa drugs, antibiotics, furans, synthetic antimicrobials, and insect repellents, disinfectants, etc. are used as a therapeutic agent for preventing diseases of fish used in the domestic aquaculture industry, but these preventive therapeutic agents have some disadvantages in use.

First, in order to exert the therapeutic effect, it must be maintained at a certain concentration in the fish body. Therefore, it is ineffective in stopping or oral administration. Second, it inhibits or kills the proliferation of other useful microorganisms in the aquarium. This is because it has a poor absorbency in the body and is used as a bath or resistant bacteria.

Therefore, the selection of appropriate preventive treatments for disease prevention and treatment of fish is one of the most important issues in aquaculture industry. As a conventional feed additive for aquaculture fish, growth promoter for aquaculture fish using chitosan oligosaccharide derivative is an active ingredient. It is disclosed (Korean Patent Laid-Open No. 2001-0094457), which is a method of preparing a oligosaccharide prepared by hydrolyzing a polymer chitosan with an enzyme in a liquid state and using it as a feed treatment in a bath or liquid form.

However, since chitosan oligosaccharides use a lot of acid in the preparation, it causes pollution problems when the waste liquid is discharged.Oligose oligosaccharide chitosan is also used as a starting material and solubilized by acid treatment or enzyme treatment. There is a problem that the manufacturing cost is expensive because it is powdered through spray drying.

The method of water solubilizing while controlling the molecular weight of chitosan has been studied so far, but it has been impossible to put it to practical use on an industrial scale, and due to the complicated process and expensive manufacturing process, it is not economically suitable for industrial production. During the acid treatment or the enzyme treatment, there was a problem that the molecular weight is rapidly lowered in the range of 50% to 98%.

In addition, a feed additive based on chitosan, kelp and ocher has been disclosed (Korean Patent Publication No. 2001-0016738), which emphasizes two effective aspects of disease prevention and resolution of red tide in the fish. In addition to describing and predicting the generally known properties and advantages of the kelp and loess, no specific reference is made to the construction and operation of the invention.

The biggest problems in the domestic aquaculture industry are the reduction of profitability of the aquaculture industry due to the high mortality rate, the provision of hazards due to drug abuse, and the deterioration of the quality of the farmed fish. Attention has been focused on the development of additives.

Accordingly, the present inventors continue to study to solve the above problems by making the polymer chitosan or its salt as an active ingredient and adding photosynthetic bacteria, activated carbon and elite to double the physiological activity. The present invention was found to be able to manufacture an improved feed additive.

Accordingly, it is an object of the present invention to provide a feed additive for high performance cultured fish which can induce the prevention and treatment of various fish diseases occurring in the culture of fish and at the same time promote the growth and immunity enhancement of the fish.

1 is a carbon nuclear magnetic resonance spectrum of the polymer chitosan used in the present invention,

Figure 2 shows the molecular weight measurement results of the polymer chitosan used in the present invention.

The present invention as a means for achieving the above object 0.01-3% by weight of a polymer chitosan or salt thereof, 5-15% by weight photosynthetic bacteria. Provided is a feed additive for aquaculture fish containing 10-20% by weight of activated carbon, 10-20% by weight of illite, and 40-60% by weight of grain skin.

Chitosan has a poly-N-glucosamine structure, and the number 1 of the basic ring and the number 4 of the other ring are intermolecularly linked to oxygen. Chitosan means a polymer excluding chitosan oligosaccharides. The term refers to those N-glucosamine nuclei linked to 1-9 sugars at one to four bonds at one time or mixed sugars having a molecular weight slightly larger than that, and are generally referred to as low molecular weight molecules of hundreds to thousands.

The mother of chitosan oligosaccharides is a polymer chitosan. Once the oligosaccharides are oligosaccharides, it is impossible to convert them back to polymer chitosan by chemical or enzymatic treatment, whereas the polymer chitosan is low molecular weight by acid or enzymatic decomposition, and in particular, slowly low molecular weight in the fish body. In addition, the chitosan oligosaccharide not only possesses the characteristics possessed by the polymer, but also has the intrinsic physiological and immunological characteristics of the polymer, and the characteristics of the chitosan oligosaccharides and the chitosan polymers are shown in Table 1.

<Table 1> Comparison of chitosan oligosaccharides and polymer water-soluble chitosan

division Chitosan oligosaccharides Polymer Water Soluble Chitosan Average molecular weight 3,000 or less 20,000-1,000,000 (about 330,000) Viscosity 10 cPs or less 35 cPs or more Chromaticity Light yellow Pure white flavor Sour, bitter bitter A bitter taste Scope of application Limited Various rescue Structure in which the monosaccharide molecule of natural ingredient is cut Natural polymer structure characteristic As time goes by, the color turns black and hardening occurs. The color does not change after long-term storage and retains its original form Etc Limited compared to the range of application of high molecular water-soluble chitosan Excellent biocompatibility, wide range of applications for physiological activity and immune enhancement

Conventional reasons for using chitosan oligosaccharides are that they are easy to handle by solubilizing them. Under the same conditions, polymer chitosan is not solubilized, but it is easily dissolved in beneficial inorganic or organic acid solutions that are not harmful to humans or animals. Does not occur.

The high molecular weight chitosan used in the present invention has a molecular weight of 20,000-1,000,000, which is advantageous in that the physical change is small and the physiological activity and environmental effects are large.

The high molecular weight chitosan has a molecular weight of 200,000-350,000, and it is preferable to use inorganic acid salts such as hydrochloride and sulfate salts or organic acid salts such as acetate, formate, tartarate and the like so that they can be dissolved in weak acid conditions. .

In addition, the high molecular weight chitosan or high molecular weight chitosan used in the present invention may be treated with a membrane filtration technique equipped with a pressurized system to use a purified high molecular weight chitosan or high molecular weight chitosan.

Photosynthetic bacteria are anaerobic microorganisms that promote the growth of plants such as amino acids, hexanes, bioactive substances, and sugars of nitrogenous compounds by using light and heat received from the soil as energy sources as substrates of organic waste and organic matter. It is an independent nutritional microorganism that produces a number of useful substances, including useful microorganisms that produce antioxidants, and contains various beneficial bacteria and minerals, among which they aggregate and chelate chitosan and are absorbed as nutrients.

Photosynthetic bacteria used in the present invention are Rhodopseudomonas palustris, Rhodopseudomonasspheroides, Lactobacillus paracasei, Candida valididases, and Altustobus. One or two or more selected from the group consisting of

Activated carbon used in the present invention is produced by harvesting wood and charcoal, and then pulverized, has excellent adsorptive power, deodorizing and discoloring, and the effect after feeding fish has no smell, diarrheal disease is reduced as well. Eliminates body toxicity and filters turbid water.

In addition, the illite used in the present invention is to remove impurities by screening with a sieve, it is preferable to use a pulverized by drying, sterilized for 2-4 hours at 100-120 ^° C. It acts as a clearer, enhances the vitality of fish and keeps fresh.

As the grain husk used in the present invention, rice bran, oil foil or fish foil may be used in addition to the skim steel.

The components used in the present invention not only maintain the characteristics of each component, but are also formulated as a mixture to increase the benefits of each of them, such as the frequency of fish disease occurrence, water temperature conditions, pH state, and growth of fish. It can be used to adjust the mixing ratio according to the condition, the feed additive for farmed fish according to the present invention is a natural feed additive to promote the growth of fish and growth and physiological activity of the fish and mixed with commercial feed and oral and small doses It is characterized by the economical feed additive that can double the functional effect.

Hereinafter, the content of the present invention will be described in detail through examples and test examples. However, these are intended to describe the present invention in more detail, and are not intended to limit the scope of the present invention thereto.

Example 1 Preparation of Chitin

500 g of crab shells were washed with water to remove impurities, filtered, dried for 24 hours at around 80 ° C, and then ground in a mortar and then transferred to a suitable reactor. 4.5 L of 4% aqueous sodium hydroxide solution was added thereto, followed by stirring at 70 ° C for 2 hours. Protein was removed.

The residue shells were filtered and washed with cold water until neutral pH to obtain a colorless filtrate. Then, 8 liter of 8% hydrochloric acid solution was added to the residue shells obtained in the previous step, and reacted at room temperature until there was no gas evolution. Was removed.

After the reaction was completed, the mixture was filtered, washed with cold water until neutral pH, and dried in a dryer at 65 ° C. for 24 hours to prepare chitin.

Example 2 (Preparation of Chitosan)

A reflux condenser, a thermometer, a heating coil device, a stirring device, and a nitrogen supply device were installed in a 30-liter reactor, and 200 g of the chitin fragment obtained in Example 1 was added to 15 liters of 50% sodium hydroxide solution, and nitrogen gas was injected into the reactor. The reaction was carried out for 1 hour at.

The reaction mixture was cooled to room temperature, added with 10 L of water, filtered after 24 hours, washed with distilled water until neutral, and transferred to a dryer for 2-5 hours at 70 ° C., each dried for 2-5 hours to give 154 g of colorlessness. Got closer to chitosan.

Example 3 (Preparation of Chitosan Hydrochloride)

227 ml of 20% hydrochloric acid was added to 20 l of distilled water at pH 5.6, and 200 g of chitosan having a deacetylation degree of 93 and a molecular weight of 330,000 was prepared in Example 2 with stirring for 30 minutes at room temperature with good dispersion, followed by shaking for 3 hours. And dissolved.

The solution was lyophilized for 24 hours to obtain a polymeric chitoate salt having a viscosity of 40 centipoise, which was distilled water at room temperature (20 with 1%, 2%, 3%, 4%, 5%, and 6% aqueous solution). It was a water-soluble chitosan which can be prepared at -25 ^o C).

The chitosanate prepared above was converted to purified chitosan by treatment with a membrane filtration technique equipped with a pressurization system, and then dried in the same manner as in Example 2 to prepare a solid phase.

Example 4 Preparation of Feed Additives

In a V-mixer, 4 kg of degreasing steel, 1.5 kg of activated carbon, and 1.5 kg of illite were uniformly mixed, and 350 ml of an active water 1.5% solution of the polymeric chitoate prepared in Example 3 and 1000 ml of photosynthetic bacteria were prepared under the conditions of 20 ^° C. or less. Was added stepwise and mixed for 2 hours to prepare a feed additive.

The illite used in the above is a pulverized mineral material which is selected by sieving to remove impurities, dried and sterilized at 110 ^o C for 3 hours, and measured by atomic spectrophotometer. As a result, 29.3% silicon, 2.68 ppm iron, 1.33 ppm zinc, Manganese was 0.23 ppm, copper 0.07 ppm, sodium 0.02 ppm, potassium 0.09 ppm, calcium 0.06 ppm and pH was 5.06.

In addition, photosynthetic bacteria is also a jusegyun Pseudomonas Palouse Tris 10 ⁶ cfu / ㎖, also Pseudomonas sphaeroides 10 ² cfu / ㎖ and part bacteria Lactobacillus para Kasei 2.4X10 ⁵ cfu / ㎖, Candida balrida 2.7X10 ⁵ cfu / ㎖ and A group composed of Streptomyces albus 4.0 × 10 ⁵ cfu / ml was used.

<Test Example 1> (Investigation of Characteristics of Polymer Chitosan)

Physical properties such as particle size, viscosity, degree of deacetylation of the polymer chitosan prepared in Example 2, and component analysis such as moisture, ash, heavy metals, arsenic, chlorine content, and biological properties such as total bacterial count, E. coli The results of the investigation are shown in Table 2.

<Table 2> Characteristics of Polymer Chitosan

Item Characteristics Remarks Statue White powder Particle size 80 mesh Water content 4.73% Ash 0.54% Viscosity 320 cPs * Deacetylation Degree 93 heavy metal 5 ppm or less Total number of bacteria 3,000 / g or less Coliform group voice arsenic 0.1 ppm or less chrome 0.7 ppm Goat 0.003% or less Bielstein test voice ** ¹³ C NMR spectrum 1

* Measured at 200 rpm with a rotational viscometer (Brookfield DV-II ⁺ ) at 20 ° C

** Halogen element detection method

Test Example 2 (Measurement of Molecular Weight of Refined Polymer Chitosan)

The purified polymeric chitosan prepared in Example 2 was dissolved in 0.1 M acetic acid and 0.1 M calcium chloride solution, and the concentration was 0.3%, and filtered through a 0.45 μm filter. Linear (ultrahydrogel linear) and ultrahydrogel (ultrahydrogel) 500 column is connected to the results of measuring the molecular weight of the purified polymer chitosan by GPC (Younglin Science, South Korea) device is shown in FIG.

At this time, the temperature of the column oven was maintained at 45 ℃, the flow rate of the solvent was maintained at 1ml / min, and 100 μl of 0.3% polymer chitosan solution was injected by using a RI detector (detector), and the standard of molecular weight was pullul Pullulan (Shodex, Japan) 0.1% solution was used.

As shown in FIG. 2, the number average molecular weight of the purified polymeric chitosan used for this invention was about 330,000.

<Test Example 3> (Death effect of Scutica ciliated insects according to the concentration of the purified polymer chitosan)

In order to determine the killing effect of Scutica ciliated insects according to the concentration of purified chitosan, purified Schiutica ciliated insects were added to 10 L of seawater and 0.08%, 0.17%, 0.37%, and 0.68% of the purified polymeric chitosan prepared in Example 2 were added. Table 3 shows the results of investigating the killing time of Scuticociliatids according to the concentration of polymer chitosan.

<Table 3> Scutica killing effect according to high concentration of chitosan

Polymer chitosan addition concentration (%) Control 0.08 (%) 0.17 (%) 0.34 (%) 0.68 (%) Processing time 0 minutes 137 * 152 146 182 167 Processing time 5 minutes 141 128 52 24 6 Processing time 10 minutes 147 110 32 7 2 Processing time 20 minutes 159 95 25 0 0 Processing time 30 minutes 162 86 12 0 0 Processing time 45 minutes 165 42 7 0 0 Processing time 60 minutes 173 26 0 0 0 90 minutes turnaround 176 7 0 0 0 Processing time 120 minutes 179 0 0 0 0

* It means the number of squat dogs and the unit is number / ml.

As shown in Table 3, the minimum killing concentration was 0.08% at 0.08% to 0.68% of the purified polymer chitosan. The number of emergent populations decreased markedly after the activity of Scutica decreased rapidly in proportion to the concentration and treatment time.

Therefore, it can be seen that the purified polymer chitosan according to the present invention is a very effective fish disease prevention additive that exhibits a complete killing effect against Scutica after 1 hour to 20 minutes of treatment time.

<Test Example 4> (Effect on Fish Growth and Survival Rate of Feed Polymer Additives Containing Tablet Polymer Chitosan)

In the rearing of farmed fish, the health status of the fry, growth control and feed feeding at the stage of fry are essential for the breeding of high quality farmed fish. In order to find out, the purified polymer chitosan prepared in Example 2 was added at a level of 0.08% to 0.68% by weight of the extruded feed, and the growth of fish during 30 days of larval stage was the most affecting the growth and quality up to the stage And the results of the survival rate are shown in Table 4.

At this time, the fry test group selected 300,000 fish of flounder fry (1 ~ 1.2g in weight, 4 ~ 5 cm in length) and stocked 5,000 rice in 3 tanks and 3 control tanks and stocked in 1 ton / FRP round tank.

<Table 4> Effect of Fish Growth and Survival Rate on the Addition Concentration of Polymer Chitosan

Polymer chitosan addition concentration (%) Control 0.08 0.17 0.34 0.68 A B C A B C A B C A B C A B C 1 day form period 1.2 4.5 One 1.3 4.4 One 1.3 4.4 One 1.3 4.5 0 1.5 4.6 0 3 days 1.5 5 11 1.5 4.8 3 1.5 5.1 One 1.6 5.8 0 1.8 6.2 0 7 days 2.4 6.5 28 2.5 6.1 10 2.6 6.7 5 2.6 7.0 0 2.8 7.3 0 15 days 4.2 7.1 76 4.3 7.1 0 4.3 7.3 0 4.4 7.7 0 4.7 7.8 0 30 days 6.5 7.8 84 6.2 7.7 0 6.7 7.8 0 7.6 8.1 0 8.7 9.5 0

A represents the body weight and the unit is g.

B is the body length and the unit is cm.

C represents mortality and the unit is%.

As shown in Table 4, the addition effect of the purified polymer chitosan on the average body weight and the average body length did not show a significant difference in the concentrations of 0.08% and 0.17%, but the weight and body length of the 0.34% and 0.68% treatments were not significantly different. It showed an effect on the increase of.

On the other hand, mortality, one of the most important management items in the fry stage of fry, showed that both groups of feed additives containing purified polymer chitosan were effective in suppressing mortality, and both 0.08% and 0.17% of the concentration of purified polymer chitosan The mortality suppression effect was significantly higher than that of the control group from 1 day to 1 week, and no mortality occurred after 15 days.

Also, 0.34% and 0.68% of the purified polymer chitosan showed a remarkable effect that no mortality occurred from the first day of cultivation, and the efficacy of the cultured fish feed additive containing the purified polymer chitosan was demonstrated.

Experimental Example 5 (Effect of Edward Edward's Growth on Purified Polymer Chitoate-Containing Feed Additive)

In order to examine the growth inhibitory effect of Edward's feed additive containing the purified polymeric chitoate, the purified polymeric chitolate prepared in Example 3 was added at a level of 0.08% to 0.68% by weight of the extruded feed. Table 5 shows the results of investigating the appearance rate of cysts for 360 days, which is the time required for the flounder stage of the flounder in the fry test group as in Fig. 4.

<Table 5> Growth Effect of Edward Bacteria by High Molecular Weight Chitoates

High concentration of polymer chitoate (%) Control 0.08 0.17 0.34 0.68 0 days 85 * 43 12 3 2 15 days 83 40 10 2 0 30 days 83 35 9 0 0 Form period 45 days 85 25 8 0 0 60 days 86 14 0 0 0 90 days 85 13 0 0 0 180 days 80 4 0 0 0 Form period 270 days 82 2 0 0 0 Form period 360 days 79 0 0 0 0

Figures in Table 5 represent Edward cyst expression (%).

As shown in Table 5, the removal rate of cysts in the purified polymer chitosan treated group was greater than that of the control group. Two of them were removed and the appearance of cysts was significantly reduced from 45 to 60 days.

The 0.17% treatment group showed an incidence of 1/8 to 1/10 compared to the control, and no cysts occurred after 60 days, and the concentration of purified cysts from 0.34% and 0.68% from the beginning of culture A scavenging effect was observed, but after 30 days no appearance of Edward cysts was found.

<Test Example 6> (Quality Analysis of Feed Additive Feeding Flounder Containing Tablet Polymer Chitosan)

In order to evaluate the quality of the flounder after feeding of the feed additive containing the purified polymer chitosan, the results of the analysis of unsaturated fatty acid, amino acid content and texture of meat were shown in Table 6, Table 7 and Table 8.

<Table 6> Unsaturated Fatty Acid Composition of Cultured Olive Flounder

division Fatty Acid Methyl Ester (wt%) sample Form period C14: 0 C16: 0 C16: 1 C18: 0 C18: 1 C18: 2 C18: 3 C20: 5 C22: 5 C22: 6 Control In March 6.57 24.23 10.81 3.64 17.66 9.31 1.51 9.65 2.95 13.47 June 8.9 23.7 10.9 3.1 15.5 8.7 - 9.9 3.5 15.8 September 8.5 22.68 9.72 2.12 16.1 8.23 1.45 10.2 3.66 17.34 December 7.8 22.51 9.61 2.33 14.3 8.11 1.22 12.65 2.72 18.75 Treatment In March 5.40 24.27 11.36 4.11 17.29 8.28 1.53 10.07 3.04 14.65 June 8.4 24.4 11.1 3.4 14.9 8.1 - 9.2 3.4 17.1 September 6.63 22.33 9.42 2.34 12.56 7.44 1.21 13.74 2.67 21.66 December 5.79 21.88 8.53 2.23 11.47 7.62 0.4 16.72 2.15 23.24

* C20: 5-EPA, C22: 6-DHA

Fish is essentially a natural food containing unsaturated fatty acids. The low incidence of cardiovascular and vascular diseases is found in the group that eats large amounts of fish. And docosahexaenoic acid (DHA, 22: 6 ω6), these fatty acids have been shown to reduce levels of triglycerides and cholesterol in the blood.

Therefore, observing the change of EPA and DHA contents in unsaturated fatty acids of fish oil in aquaculture fish is very important in connection with the physiological activity of polymer chitosan. In other words, since the fish themselves produce unsaturated fatty acids and accumulate in the body through biological metabolism, the feeding of high molecular weight chitosan, which is effective for physiological activity, promotes the physiological activity and greatly affects the formation of metabolites in the fish body. Is expected.

As shown in Table 6, the EPA and DHA contents of the samples fed the polymer chitosan were increased compared to the control, and after 9 months and 12 months of culture, the EPA content was 35% compared to the control. And increased by 32%, and DHA content increased by 25% and 24%, respectively.

This results prove that the polymer chitosan has a function of promoting physiological activity on living organisms, and it is a remarkable result that is consistent with the growth promotion of fish and the preventive effect on fish disease. Therefore, the results of the unsaturated fatty acid content change of the olive flounder according to the feed of the feed additive containing the polymer chitosan according to the present invention has an important meaning in terms of the production of high-functional fish.

<Table 7> Amino Acid Composition of Cultured Flounder by Culture Period

Amino Acid (mg / 100g) Control period Processing period In March June September December In March June September December Aspartamic acid 44.9 45.1 45.7 46.4 44.8 45.6 45.9 47.1 Serine 11.6 12.8 11.4 12.3 11.1 12.4 11.7 12.8 Glutamic acid 68.7 69.5 67.3 69.8 64.3 69.7 68.1 70.2 Glycine 31.8 30.7 30.7 31.6 28.8 30.9 31.1 31.5 Histidine 11.0 12.1 12.7 11.8 11.9 12.8 13.7 13.2 Threonine 17.9 18.2 18.1 18.6 17.5 18.8 18.7 19.5 Arginine 32.0 33.2 33.1 33.7 33.3 33.8 34.6 36.2 Alanine 31.7 31.5 31.5 32.4 31.7 31.6 31.8 32.1 Cystine 16.7 15.6 15.8 16.4 15.8 16.4 16.1 16.3 Cysteine 3.5 3.4 3.7 3.6 3.3 3.5 3.9 4.1 Tyrosine 12.0 12.1 12.7 12.8 12.4 12.5 13.4 13.8 Valine 25.6 26.6 25.7 25.9 25.7 26.7 26.5 26.7 Methionine 12.5 13.1 13.4 14.3 12.6 14.5 14.8 14.3 Lee Sin 41.4 41.5 41.3 41.7 40.1 41.1 41.5 42.4 Isoleucine 23.4 24.7 24.6 24.8 23.6 25.6 25.4 26.1 Leucine 36.3 36.5 36.1 36.8 36.4 37.4 37.6 37.9 Phenylalanine 17.6 17.4 17.8 16.8 17.1 17.8 18.4 17.8 Total amino acids 440.8 444.0 441.6 449.7 433.5 447.5 453.2 462

As shown in Table 7, the amino acid composition of the high-molecular chitosan-grade flounder samples contained some essential amino acids, such as histidine, arginine, isoleucine, and phenylalanine, during the 3 months, 6 months, 9 months, and 12 months of culture period. The results showed a little increase compared to the control, which gives an important meaning that the essential amino acid content is increased by feeding the feed additive containing polymer chitosan.

<Table 8> Texture of halibut meat quality according to culture period

Interorganization 3 months 6 months 9 months 12 months Hardness (g) 1245 ± 32 1347 ± 45 1352 ± 36 1436 ± 47 Elasticity 0.64 ± 0.02 0.66 ± 0.05 0.77 ± 0.06 0.85 ± 0.04

As shown in Table 8, as a result of measuring the texture of the fish tissue of the flounder edible portion, the hardness and elasticity of the polymer chitosan feed additive treatment showed a proportional increase as the feeding period increased compared to the control.

This result seems to be in good agreement with the general preference characteristics that favor elastic texture when ingesting fish, and it can be predicted to have a quality characteristic that can maintain fish freshness compared to the control during storage distribution.

Therefore, the production of aquaculture fish by feeding the feed additive for fish containing the polymer chitosan according to the present invention can meet the recent consumer desire for human health and functional foods, and can supply new functional fish foods. Rather, it believes that it can contribute to providing technological and economic value that can take current aquaculture technology to the next level.

The feed additive for aquaculture fish according to the present invention is mixed with the feed and fed by the oral administration method, so that the effect is obvious by a small amount, and it gives a synergistic effect on the nutrients contained in the feed, even when continued or overdose. Not only does it have no resistance or side effects such as lowering immunity, but especially for fish species that stop growing at low temperatures, it is possible to raise healthy and high-quality farmed fish by maintaining digestion and growing even at low temperatures.

In addition, the feed additive for aquaculture fish according to the present invention is a bacterial, viral, parasites that cause large mortality in the farms of saltwater fish species such as flounder, perch fish, rockfish, dome, etc. Not only can it prevent and treat sexually transmitted diseases, but it can also enhance immunity and promote physiological activity.

Claims (6)

0.01-3% by weight of polymer chitosan or salt thereof, 5-15% by weight of photosynthetic bacteria. Feed additives for farmed fish containing 10-20% by weight of activated carbon, 10-20% by weight of illite, 40-60% by weight of grain shell The method of claim 1, Feed additive for aquaculture fish, characterized in that the molecular weight of the polymer chitosan is 20,000-1,000,000 The method of claim 1, Feed additive for aquaculture fish, characterized in that the molecular weight of the polymer chitoate is 200,000-350,000 The method according to claim 1 or 3, Feed additives for farmed fish characterized in that the polymeric chitoate is an inorganic acid salt or an organic acid salt The method of claim 1, Photosynthetic bacteria are composed of Rhodopseudomonas palustris, Rhodopseudomonas spheroides, Lactobacillus paracasei, Candida valida, and Streptomyces group Feed additives for farmed fish, characterized in that one or two or more selected from The method of claim 1, Grain husks are feed additives for farmed fish, characterized in that they are skim, rice bran, milk or fish