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Ulcer Diseases in Cultured Fish in Mymensingh and Surrounding Districts

M. Muniruzzaman
Department of Aquaculture, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M. B. R. Chowdhury
Department of Aquaculture, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

The status of ulcer diseases in cultured fish in 14 upazilas (sub-districts) of Mymensingh and surrounding six districts were investigated during the winter in 2001-2002 and 2002-2003. Fish were visibly affected by ulcer diseases including epizootic ulcerative syndrome (EUS). Prevalence of disease varied in different districts, months and fish species in the two years. The highest prevalence of disease was in Jamalpur district where 90% fish ponds in Melandah upazila were affected during 2001-2002, whereas 80% affected ponds were observed in sadar upazila of Mymensingh district during 2002-2003. The highest prevalence was in January and the lowest in October. The prevalence of ulcer diseases in different fish species varied significantly (p<0.01). Among the 10 affected species, six were histopathologically EUS-positive and four EUS-negatives. Cirrhinus cirrhosus and Barbodes gonionotus were highly affected by ulcer diseases including EUS.

Keywords: Ulcer diseases, cultured fish, Mymensingh and surrounding districts

Location: Mymensingh and its surrounding six districts, Kishoreganj, Netrokona, Sherpur, Jamalpur, Tangail, and Gazipur

Start Date: 00-00-2001

End Date: 00-00-2003

Program Area: Animal Health and Management

Commodity:

Objectives:

1. To determine the prevalence of ulcer diseases in cultured fish during winter in Mymensingh and its surrounding six districts, as in this part of the country fisheries are important.

Methodology:

Selection of study area - Field survey of ulcer diseases was carried out in cultured fish in Mymensingh and its surrounding six districts, Kishoreganj, Netrokona, Sherpur, Jamalpur, Tangail and Gazipur. The sampling periods were October 2001 to March 2002 and October 2002 to March 2003, when ulcer diseases in fish commonly occur. Two upazilas were randomly selected from each district. Ten fish culture ponds at different locations within each upazila were selected. Disease investigation and sampling of fish - A total of 100 fish belonging to different species were caught by seine or cast net randomly and investigated clinically. Among the investigated fish, 10 were randomly sampled considering their disease signs and were immediately brought to the laboratory in the same pond water in a bucket. Fish with lesions were diagnosed clinically. EUS-affected fish were recognize. Briefly, the signs were: Type-1: early lesions, pinhead-sized red spots on the body surface with no noticeable haemorrhage or ulceration and skin around the spots normal with no discolouration; Type-2: moderately advanced lesions - approximately 2-4 cm diameter raised, circular, discoloured areas on the body surface, and soft with relatively intact skin and scales; Type-3: advanced lesions - circular or oval, open dermal ulcers, usually extending into the skeletal muscle, with large haemorrhagic and necrotic open ulcers on the body surface, devoid of epidermis and scales with loss of dermis. A pond was confirmed as EUS-positive when at least one fish was found with typical EUS-like mycotic granulomas on histopathology. Ulcer diseases without mycotic granulomas were confirmed as EUS-negative. Statistical analysis - Analysis of variance was performed using MSTAT program. The mean differences were compared with Duncan’s Multiple Range Test.

Source of Information: The Bangladesh Veterinarian (2008) 25(1) : 40 – 49

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Prevalence of disease varied in different districts, months and fish species in the two years. The highest prevalence of disease was in Jamalpur district where 90% fish ponds in Melandah upazila were affected during 2001-2002, whereas 80% affected ponds were observed in sadar upazila of Mymensingh district during 2002-2003. The highest prevalence was in January and the lowest in October. The prevalence of ulcer diseases in different fish species varied significantly (p<0.01). Among the 10 affected species, six were histopathologically EUS-positive and four EUS-negatives. Cirrhinus cirrhosus and Barbodes gonionotus were highly affected by ulcer diseases including EUS.

Knowledge Management: Journal