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Diagnosis and Development of Control Measures for Fish Disease

Dr. A.N. Hasna Banu
Senior Scientific Officer
Freshwater Station, Bangladesh Fisheries Research Institute, Mymensingh

Mr. Masud Hossain Khan
Scientific Officer
Freshwater Station, Bangladesh Fisheries Research Institute, Mymensingh

Abstract/ Executive Summary:

Neem seed extract resulted 16.7% healing of lesion and mortality was stopped at the end of the trial. In case of EUS, neem seed extract cured 16.6% superficial lesion of the fishes and mortality was stopped. In case of garlic treatment, 7.7% fingerlings were healed from lesion at the end of the experiment. Disease symptoms disappeared and the fishes seemed to be healthy when they were treated with dried ground neem leaves. Neem seed and leaves were found effective aganist fish disease during the preliminary treatment trials.

Keywords: Diagnosis, Control measures, Fish disease

Location: BFRI, Mymensingh

Start Date: 01-07-2002

End Date: 30-06-2003

Program Area: Animal Health and Management

Commodity: Diseases

Objectives:

Diagnosis of major disease problems in different aquaculture farms; to develop suitable herbal drugs and use of chemicals for controlling EUS and other fish diseases; and case study with advisory services to fish and shrimp farmer's husbandry problems.

Methodology:

Diseased fish with clear clinical signs and significant mortality have been collected from different private fish farm of Mymensingh area. Water quality parameters viz., temperature, DO, pH, total alkalinity, total ammonia of the affected ponds were analyzed at the pond site. The median lethal conc. (LC₅₀) of the drug to be used were determined by using healthy fingerlings of carpa and cat fishes. Healthy fingerlings were acclimatized for a week and at zero mortality the fingerlings were tested with different herbs. Diseased carp species with 30% mortality was treated with neem seed extract at different doses from 5.5 to 16 ppm and exposed for a period of 4 weeks. Fish suffering from EUS with 20% mortality was treated with neem seed extract at the dose of 20 to 35 ppm for 3 weeks. Affected magur fingerlings showed 50% mortality were treated with garlic cloves extract at the rate of 100 to 400 ppm and exposed for 4 weeks. Pangus with bacterial infection was treated with dried ground neem leaves at the rate of 200 ppm for a period of 21 days.

Source of Information: Annual Research Program 2002-03. BFRI, Mymensingh.

Article Link (Online Journal):

Funding Source:

1. Government

Budget: Two lakh fifty thousand

Total Budget (Tk.) : Two lakh fifty thousand

Achievement/Findings:

A large number of aquatic animals will be saved if early disease diagnosis can be done; effective control measures of major fish diseases will be available; fish growers will be benefited by getting the accurate doses of drugs and chemicals; and through case study, farmers will be immediate benefited by getting control measures.

Knowledge Management: Report/Proceedings