JPH0259524A - Remedy for eel disease - Google Patents

Abstract

PURPOSE:To obtain a remedy for eel diseases having treating effects on bacterial gill disease of eel, usable with an extremely low concentration, comprising a chlorite as an active ingredient. CONSTITUTION:The title remedy containing a chlorite (e.g., alkali metallic salt of chlorous acid, preferably sodium chlorite or potassium chlorite) as an active ingredient. The chlorite is added to breeding water or agent-containing water so as to give 0.1-100ppm, preferably about 1-10ppm concentration. Time required to bring the chlorite into contact with sufferer eels is 1-24 hours in agent-containing water in the case of light symptom and 5-10 hours in breeding water in the case of advanced symptom. The remedy needs no specific facilities and can attain purposes by adding the remedy to an existing breeding environment.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a novel therapeutic agent for eel diseases, and more particularly to a therapeutic agent for eel diseases that has outstanding effects on bacterial gill disease.

[Conventional technology and its problems]

Bacterial gill disease among eel diseases has been on the rise in recent years due to the use of low-quality feed and overcrowded farming, accounting for 34% of the approximately 2.8 billion yen in damages caused by eel fish diseases. It has reached this point. The pathogen is Fl@zlba
It is called ctercOlumnaris, and 1% saline and furanic drugs such as fragilidone are mainly used for its treatment. However, in the case of salt, it requires a large amount when used in one aquaculture pond, and it takes time to dissolve it completely.Furan agents, however, are not very effective. However, there were safety issues such as carcinogenicity.

[Means to solve the problem]

In view of the current situation, the present inventors conducted intensive research to develop a drug effective for the treatment of bacterial gill disease in eels.
The present invention was completed based on the discovery that the present invention exhibits a bactericidal effect against Ibaet@r eolumnarim and has an excellent therapeutic effect on gill disease in eels infected with the tube.

That is, the present invention provides a therapeutic agent for eel diseases containing chlorite as an active ingredient.

Examples of the chlorite used in the present invention include alkali metal salts and alkaline earth metal salts of chlorite, and among these, sodium and potassium salts of alkali metal salts are preferred.

Among these chlorites, sodium chlorite is a substance designated as a food additive and whose safety has been demonstrated.

There are no particular restrictions on the concentration of chlorite, but α1
It may be added to rearing water or medicinal bath water to a concentration of about 100 ppm%, preferably 1 to 10 ppm. Furthermore, there are no particular restrictions on the method or time for contacting the solution of the present invention with the diseased eel, and it may be carried out as appropriate depending on the severity of the symptoms. For example, if the symptoms are mild, take 1 hour in medicated bath water.
~2 hours, if the symptoms are progressing, 5-1 hours in the breeding water
It is sufficient if the contact is made for about 0 hours.

Types of eel to be treated in the present invention include Japanese eel, European horned eel, lamprey,
Examples include various eels that are bred or live in Japan, such as the giant eel, the Philippine eel, the New Zealand eel, and the American eel.

〔Effect of the invention〕

The therapeutic agent for eel diseases of the present invention can be used at extremely low concentrations, does not require special facilities, and can achieve its purpose by adding it to a conventional breeding environment.

〔Example〕

This will be explained briefly by giving examples.

Example 1 Prepare two 501-volume 79-light aquariums, each with 2
20 tons of rearing water at 4° C. was added, and 40 Japanese eels with an average weight of 340 F were housed (test plot and control plot).

Flexibaeter a with viable bacteria count of 10'/d in both areas
olumnarim was added and infected. One hour after infection, sodium chlorite was added to test area 2 at a concentration of 5 ppm, and 8 hours later, the infected point was transferred to a running water tank at 24°C, and changes in the number of viable bacteria in the infected tank and survival status were observed over time. I observed it. The same procedure was carried out for a control group in which no sodium chlorite was added.

Concerning viable bacteria, the control group showed a flat or slightly increasing tendency over time and reached around 101 after 8 hours, whereas the test group showed a sharp decrease over time and fell below the detection limit after 8 hours. became. Regarding the survival status, the number of fish in the test plot decreased over time as they died due to gill disease, and there were only two fish after 8 hours, whereas the test plot was healthy.

Example 2 Two Q-n-light aquariums with a capacity of 30 kg (control area and test area)
10 tons of breeding water at 24°C was added to each, and the average weight was 35. We housed 20 eels of 9 eels each suffering from gill disease. Sodium chlorite was added to the test plot at a concentration of 10 ppm and left for 10 hours.

Thereafter, they were transferred to a running water tank at 24°C, and their survival status was observed in comparison with a control group to which no sodium chlorite was added.

One week later, while the control group had died of metallurgy, only one fish had died in the test group.

that's all

Claims (1)

[Claims] 1. A therapeutic agent for eel diseases containing chlorite as an active ingredient. 2. The therapeutic agent for eel disease according to claim 1, wherein the disease is bacterial gill disease.