JP2000016937A - Parasiticide for hatchery fish - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a parasiticide for hatchery fish which has fine decomposability in seawater, shows safe and high effects without being remained and accumulated in marine organisms and is useful in the extermination of parasites, e.g. gill flake of yellow tail (Heteraxine heterocerca), Benedemia seriola and the like in hatchery fishes, e.g. Fugu rubripes and the like, by including peracetic acid as an active ingredient. SOLUTION: This parasiticide is obtained by including peracetic acid as an active ingredient. For example, gill flake of yellow tail (Heteraxine heterocerca), Benedemia seriola and the like can be exterminated at 8 ppm or more and 35 ppm or more, respectively, in the concentration of peracetic acid. It is favorable to include hydrogen peroxide and acetic acid as stabilizers in this medicine. In exterminating parasites, this medicine is preferably neutralized with an alkali to use.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agent for controlling parasites on cultured fish.

[0002]

2. Description of the Related Art When a parasite is infested in a cultured fish, such as a puffer fish, a yellowtail, a yellowtail, a Japanese flounder, and the like, growth is inhibited, anorexia is reduced, and the commercial value is reduced. Cordyceps and insects are the main parasites. The damselfly hooks on the skin of fish and eats epithelial cells and pigments of fish. Insects parasitize the gill lobes of fish, and the gills greyish-white due to the direct etiological effect of anemia, resulting in anorexia and weakness. In severe cases, death may occur.

[0003] As measures to eliminate these parasites,
A freshwater bath, a concentrated saltwater bath, and a medicinal bath are used. In this method, fish are picked up and stored in still water. Freshwater baths provide a large supply of freshwater: difficult to transport,
It is virtually impossible. Concentrated salt bathing is also not possible due to the high risk of fish becoming dehydrated and the need for large amounts of salt. Therefore, a chemical bath method using formalin is currently employed. However, the method using formalin has the disadvantage that it is capable of extermination of spider worms but cannot exterminate the viper, and also has a problem in that it accumulates in fish by regular formalin treatment and generates off-flavor fish.

[0004] Formalin has a capacity of 1000 per cage per year.
Kg is also used, and a large amount of formalin is discarded into seawater after treatment, which has a great effect on marine fish in nearby fishing grounds. Recently, a large amount of formalin is accumulated in cultured pearl oysters and killed in large quantities. Accidents have also occurred. Formalin stimulates mucous membranes such as the respiratory tract, and is effective in 0.1L in 1L of air.
The presence of 5 mg can be fatal. It is a very dangerous compound for work. Therefore, development of a drug that is safe for the human body, has good decomposability in seawater, and can eliminate parasites without residual accumulation is keenly desired.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a safe and highly effective parasite control agent for cultured fish, which has good degradability in seawater and does not accumulate in marine products. .

[0006]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, parasites can be eliminated by immersing cultured fish with a treatment solution containing peracetic acid as an active ingredient (dissolved in seawater). We found that we could get rid of it.

[0007] As shown in Tests 1 to 7, by treating the parasitoids with parasitoids and insects with an aqueous solution of peracetic acid, it is possible to exterminate the insects without damaging them. With formalin currently used, it is not possible to exterminate spiders even if it is able to exterminate spider worms, but by using the treating agent of the present invention, it is also possible to exterminate insects. In the case of cultured tortoises, if the larvae attach and breed, they lose their appetite and lose their appetite, and lose their commercial value or die in severe cases. The insects that could not be controlled by formalin treatment can be controlled by the present invention.

[0008] Test 1 shows that the insects can be controlled at a peracetic acid concentration of 1.8 ppm or more, and Test 2 shows that the worms can be controlled at a peracetic acid concentration of 35 ppm or more. LCAP used in the examples is in a state where hydrogen peroxide and acetic acid are mixed in order to stabilize peracetic acid. Therefore, Tests 3 and 4 were performed in order to examine whether hydrogen peroxide and acetic acid in LCAP were not involved in the eradication of spider and insects. Even if treated with the same amount of hydrogen peroxide or acetic acid contained in the LCAP working concentration,
Since there was no effect at all, it was found that hydrogen peroxide and acetic acid were the only effects of peracetic acid regardless of the parasite control effect. In Test 6, the effects of neutralizing the pH during the peracetic acid treatment to 7.5 and examining the effects on the viper and the tiger puffer were examined. The effect on the fish (injury) is reduced. Therefore, by neutralizing and treating, the influence on the fish body can be reduced, the usable concentration range is expanded, and the chemical bath treatment can be performed safely. In addition, since high-density treatment can be performed, the control of parasites can be shortened in a short time.

The peracetic acid used in the present invention is a very safe substance because it is rapidly decomposed in seawater to acetic acid, and finally changes to carbon dioxide and water.

(Test 1) LCAP (Daicel Chemical Co., Ltd.)
(7% peracetic acid solution), 100 ml of each solution was prepared, and the larvae attached to the cultured tiger puffer were immersed for 10 minutes or 30 minutes. The treatment water temperature was 20 ° C.
The insecticidal effect on the insect larvae after the treatment was investigated. Table 1 shows the results of the 10-minute treatment, and Table 2 shows the results of the 30-minute treatment.

[0011]

[Table 1]

[0012]

[Table 2]

(Test 2) A solution of each concentration of LCAP was added to 10
After adjusting the volume to 0 ml, the adult wasp was attached to the cultured tiger puffer and immersed for 10 or 30 minutes. The effect of controlling adult spider dams after treatment was investigated. The treatment water temperature was 20 ° C. Table 3 shows the result of the 10-minute treatment, and Table 4 shows the result of the 30-minute treatment.
Shown in

[0014]

[Table 3]

[0015]

[Table 4]

(Test 3) LCAP 100 ppm and LCA
After preparing a solution having the same concentration as hydrogen peroxide and acetic acid contained in 100 ppm of P, the insects were immersed in the larvae for 10 minutes. The insecticidal effect after the treatment was examined to determine whether hydrogen peroxide and acetic acid in LCAP were involved. The treatment water temperature was 20 ° C. Table 5 shows the composition table of LCAP, and Table 6 shows the test results.

[0017]

[Table 5]

[0018]

[Table 6]

(Test 4) LCAP 500 ppm and LCA
After preparing a solution having the same concentration as hydrogen peroxide or acetic acid contained in 500 ppm of P, the larvae of the insects were immersed for 30 minutes. The insecticidal effect after the treatment was examined to determine whether hydrogen peroxide and acetic acid in LCAP were involved. The treatment water temperature was 20 ° C. Table 7 shows the test results.

[0020]

[Table 7]

(Test 5) A 20 L aqueous solution of LCAP at each concentration was prepared, and a tiger puffer to which wasp was attached was introduced and immersed while aeration was performed. The condition of the trough and the time of extermination of the wasp were investigated. Processing water temperature is 25
C., treatment was performed for up to 1 hour. The results are shown in Table 8.

[0022]

[Table 8]

(Test 6) LCAP 100 ppm · 300
ppm ・ 500ppm ・ 1000ppm and LCAP1
00ppm ・ 300ppm ・ 500ppm ・ 1000p
A solution of neutralizing pm to pH 7.5 was used to perform a test for controlling larval larvae. In addition, the effect on torafugu was investigated. The treatment was performed at 20 ° C. The results are shown in Table 9.

[0024]

[Table 9]

(Test 7) LCAP3 was placed in the Artemira tank.
100 L of a seawater solution having a concentration of 00 ppm was adjusted. One alfalfa parasitized with a viper was introduced while aeration was performed, and immersion treatment was performed for 30 minutes. Processing solution 40
Filtration was performed using a μm plankton net to collect the viper. Put 100L of seawater in the water tank
After a lapse of time, the seawater was filtered through a plankton net, and the viper was dropped after the treatment. Further, the Japanese puffer fish was again put into 100 L of seawater, and after 2 hours, the seawater was filtered to collect the dropped viper. The total number of the collected stink bugs is the number of stink bugs dropped from the fish. The number of vicarious insects remaining on the gills of Torafugu was measured and the removal rate of viper was calculated by the following formula.
The water temperature during the treatment was 21 ° C. The results are shown in Table 10.

[0026]

(Equation 1)

[0027]

[Table 10]

[0028]

By immersing the cultured fish in a seawater solution containing peracetic acid as an active ingredient, parasites can be eliminated.

Claims (3)

[Claims] A parasite control agent for cultured fish containing peracetic acid as an active ingredient. 2. The parasiticidal agent according to claim 1, further comprising hydrogen peroxide and acetic acid as stabilizers. 3. A method for controlling parasites in cultured fish, which is neutralized with an alkali during the treatment.