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Prevalence of Parasites in the Indian Major Carp, Labeo Rohita (hamilton) in Rajshahi, Bangladesh

A.M. Farhaduzzaman
Department of Fisheries, University of Rajshahi, Bangladesh

M. Manjurul Alam
Department of Fisheries, University of Rajshahi, Bangladesh

Mosharrof Hossain
Department of Zoology, University of Rajshahi, Bangladesh

M. Afzal Hussain
Department of Fisheries, University of Rajshahi, Bangladesh

Md. Habibur Rahman
Department of Zoology, University of Rajshahi, Bangladesh

Abstract/ Executive Summary:

During the study period, the highest number of parasites (94) was collected in December and lowest (15) in February. In December, highest number (18) of the species Argulus foliaceus was found. The highest prevalence (75%) and mean density (10.44) of parasites were found in the month of December 2004 and lowest (20%) in the month of February 2005. The highest abundance value was ranged from 1.25 to 7.83 in February and December respectively. Only the correlation between prevalence and abundance was found significant (r = 0.836*) at 5% level when compared among these data.

Keywords: Labeo rohita, parasite, prevalence, abundance, mean density, infestation

Location: Department of Fisheries, University of Rajshahi, Bangladesh

Start Date: 00-09-2004

End Date: 00-02-2005

Program Area: Animal Health and Management

Commodity: Carp fish

Objectives:

To find out the parasites from internal organs.

Methodology:

Fish collection and parasite identification - The investigation was carried out from September 2004 to February 2005. A total of 110 fishes were collected randomly at a regular interval, from different fish farms and fish markets in Rajshahi City. The specimens were carried to the laboratory and grouped according to their length and body weight. At first, microscopic examination were done for ectoparasites from the skin, if any cysts, ulceration and scars in the skin. Then the individual fishes were dissected to find out the parasites from internal organs. The viscera and gill filaments were kept on petridishes and bathed with the physiological saline solution (0.7% Nacl solution) for searching of parasites. The organs such as stomach and intestine were opened for the examination of parasites. All the collected parasites were fixed in glycerin and identified following standard methods. To find out the prevalence, abundance and mean density the statistical analysis were carried out. Parasites cause significant economic losses in fish farming. A knowledge of the mechanisms underlying their effects on hosts is an essential prerequisite for preventative procedures for the parasite problem in hatcheries. During the investigation a total 226 parasites representing 10 species were collected from the host fishes. Out of 10 species the seven were ectoparasites and the rest three were endoparasites. Presence of parasite species in different months are recorded. The highest number of parasites (102) were collected from the skin of the host fishes and lowest number (7) were recorded from the fins. Among them, second peak value (83) was from the gills.

Source of Information: Univ. j. zool. Rajshahi. Univ. Vol. 28, 2010 pp. 65-68; ISSN 1023-6104

Article Link (Online Journal): http://journals.sfu.ca/bd/index.php/UJZRU

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In conclusion, it may predicted that fish were more stressful condition in the experimental period due to parasitic infestation and further data is needed to give treatment against parasites in the Indian major carp, Labeo rohita.

Knowledge Management: Journal