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Caryophyllaeid Infestations on the Sex and Size of Walking Catfish Clarias Batrachus

MS Chhanda
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

KJ Chandra
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

Abstract/ Executive Summary:

An investigation was carried out on the caryophyllaeid infestations in walking catfish Clarias batrachus in relation to different sexes and size groups during August 2010 to July 2011. A total of 227 host fish were collected from different water bodies of Mymensingh for examination. Among them 188 C. batrachus were infested with 1432 parasites by five different caryophyllaeid cestodes species. Prevalence was 100% during November and December both in male and female hosts. In other period of the year, female were more infested. In male fishes, the highest intensity and abundance were recorded in December and index of infection in February. In female fishes, the lowest infestations were recorded during the months of August, September and October. Parasites showed different levels of infestations in different size groups of fishes. Higher prevalence was recorded in medium size fishes in winter and summer and smaller size fishes in autumn. However, the index of infestations and abundance were higher in same size group only in winter season. The lowest prevalence and mean intensity were recorded in rainy season and abundance was in summer in smaller size group of fish.

Keywords: Cestode infestation, Sexes, Size groups, Clarias batrachus

Location: Mymensingh

Start Date: 00-08-2010

End Date: 00-07-2011

Program Area: Pest Management

Commodity: Cat fish

Objectives:

To investigate on the caryophyllaeid infestations in walking catfish Clarias batrachus in relation to different sexes

Methodology:

Host fish, the C. batrachus was collected from different water bodies like beels, haors, rivers, farms and fish markets of Mymensingh. They were brought to the fish disease laboratory of Aquaculture Department for parasitic investigation. In the laboratory total length (TL) and sex of the fish were recorded. The host fish was classified into three different length groups of 20>, 20-23, and 23< cm. The study period was divided into four different seasons as summer (March-May), rainy (June-August), autumn (September-November) and winter (December- February) The host fish was anesthetized and opened ventrally for collection of parasites. The parasites were kept in normal saline for relaxation,alcohol. Some of the fixed specimens were prepared in glycerin jelly for clearing and others were made permanent slides staining in alum carmine, dehydrated in alcohol grades, clearing in lactophenol and mounted in Canada balsam. Infestations were analyzed according to Margolis et al. (1982) as i) Prevalence (%) = Percent of infestation of a host species, ii) Mean intensity = Number of parasites per infested host, iii) Abundance = Number of parasites per examined host, and iv) Index of infection = No. of hosts examined

Source of Information: Bang. J. Anim. Sci. 2011. 40 (1-2): 56-59

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

It may be concluded from the present investigation that C. batrachus may be affected by caryophyllaeid cestodes and infestation of parasite was found to vary with sexes and size groups of fish. Present investigation also revealed the nature and pattern of infestation in relation to sexes and size of host which may help for control measures of this parasite for successful Clariid culture.

Knowledge Management: Journal