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Some Aspects of Association and Development of Lytocestus Indicus Moghe in Catfish Clarias Batrachus (lin.)

K.J. Chandra
Department of Aquaculture, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh

R. Wootten
Institute of Aquaculture, University of Stirling, FK9 4LA Scotland, U.K.

K.Z. Islam
Department of Aquaculture, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

Some aspects of association and development of the caryophyllid cestode Lytocestus indicus Moghe, 1925 infecting the catfish Clarias batrachus (Linn.) from the Kailla Beel of Mymensingh, Bangladesh were studied. About 33.14% of Clarias batrachus were infected with a mean intensity of 3.75, mean density 1.25. The infection was not found throughout the year. Two seasonal occurrence of this cestode were observed, one in April-May and the other in August-September. However, maturation period of the worm coincided with the maturation of the host. The worm was found attached to the wall of the intestine of the host. At the site of attachment tissue layers were compressed due to mechanical injuries. Prevalence and mean intensity of infection increased with length groups. No variation in infection was significantly observed in different sexes of the host examined.

Keywords: C. batrachus, Lytocestus indicus, Catfish

Location: Mymensingh

Start Date: 00-10-1994

End Date: 00-09-1995

Program Area: Animal Health and Management

Commodity: Cat fish

Objectives:

To study about the infection and developmental stages of Lytocestus indicus in its final host the Clarias batrachus of kailla Beel in Mymensingh.

Methodology:

Fish samples were collected from the kailla Beel, Mymensingh by cast net during October '94 through September '95. Twenty specimens of Clarias batrachus were targeted to sample in every month. They were brought in a container with water. Total length and sex of the hosts were noted. The host fishes were classified into three groups on the basis of their total length. The fish were opened ventrally by a sharp scalpel. Whole gut was removed, measured and opened in physiological saline. Position of the Lytocestus indicus was noted by measurement of the gut, small worms were searched by scraping out mucus using dissecting microscope. All the worms were collected, released in water and counted. Some worms were fixed in A.F.A. stained in Alum carmine, dehydrated in alcohol grades and prepared permanent slides for determining the state of maturity. The worms were classified into four groups on the basis of their development (immature, early larval stage, sex organs not developed; maturing- sexual organs distinct and developing; mature - sexually mature, not fertilized; gravid- gravid worms containing fertilized eggs in them). Data on the number, size and developmental state of worms collected from each fish were recorded and analyzed.

Source of Information: Bangladesh J. Fish. Res., 1 (2) : 31-38, 1997

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Lytocestus indicus is one of the most important caryophyllid cestodes of C. batrachus at Mymensingh. A seasonal cycle of its infection is found in the host. Spawning season of fish, water temperature and rainfall, availability of infected food organisms may be associated factors for its invasion, development and maturation. Winter period (December-January) appeared to be the recruitment period for this worm. In case of heavy infection it can cause serious injuries by its scolex penetration to fish intestine.

Knowledge Management: Journal