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Prevalence of Ectoparasites in Farmed Pangasius Hypothalamus

M. Z. Haque
Bangladesh Fisheries Research Institute, Freshwater Station, Mymensingh 2201, Bangladesh

M.H. Khan
Bangladesh Fisheries Research Institute, Freshwater Station, Mymensingh 2201, Bangladesh

M.G. Hussain
Bangladesh Fisheries Research Institute, Freshwater Station, Mymensingh 2201, Bangladesh

Abstract/ Executive Summary:

Of the total 240 Pangasius hypothalamus (5 - 8.7cm) fry examined during September'01 to February'02, 80 (33.33%) were found to be infested with one or more ecroparasites irrespective of genera or groups. Seven parasitic groups were identified with the highest average prevalence of Trichodinids (55%) followed by Dacrylogyrus spp. ( 42%), Episrylis spp. (8%), Apiosoma spp. (7%) Argulus spp. (5%), Gyrodacrylus spp. (4%) and Piscicola spp. (2%) the lowest prevalent group irrespective of months. Trichodinid and Dacrylogyms spp. were recorded to be the dominating parasitic groups among the seven both in terms of monthly prevalence and severity of infestation throughout the period of investigation. The highest prevalence (60%) of ectoparasite was recorded in December and the lowest (10%) in February irrespective of groups.

Keywords: Prevalence, Ecroparasites, Pangus

Location: Freshwater Station, Bangladesh Fisheries Research Institute (BFRI), Mymensingh

Start Date: 00-09-2001

End Date: 00-02-2002

Program Area: Animal Health and Management

Commodity: Pangus

Objectives:

To predict the possible risk of ulcer type disease facilitated by ectoparasitic infestation in Pangus fish.

Methodology:

The investigation was carried out from September'01 to February'02 in and around Freshwater Station, Bangladesh Fisheries Research Institute (BFRI), Mymensingh, Bangladesh. Twelve monoculture based Pangasius ponds were selected for the investigation without any bias. Twenty live P. hypothalamus were captured once from each of the ponds during the sar.1pling period using a cast net. Fish were captured randomly during each sampling period irrespective of clinical signs or symptoms and carried to BFRI fish disease laboratory using plastic buckets as soon as possible in order to prevent the ecoparasitic deformity. Macroscopic ecoparasites were detected with naked eye but scrapings of skin slime and gills were thoroughly examined under compound microscope in order to identify the macroscopic ones. Fish size were recorded as well during fish examination. Parasitic identification was accomplished. Parasitic loadings for each type was categorized as low, medium and high based on visual examination and estimation.

Source of Information: Bangladesh J. Fish. Res.,S(l), 2004: 83-86

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The highest prevalence (60%) of ectoparasite was recorded in December and the lowest (10%) in February irrespective of groups.

Knowledge Management: Journal