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Monogenean Gill Parasites of Indian Major Carps from Different Fish Farms of Mymensingh, Bangladesh

K.J. Chandra
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

M.S. Jannat
Thana Fishery Extension Officer, Joypurhat, Bangladesh

Abstract/ Executive Summary:

All together 148 fish host samples of Labeo rohira, Cirrhina mrigala, Catla catla and Labeo gonius were collected from different fish farms of Mymensingh. The gill monogeneans were then dislodged from the gill under dissecting microscope and fixed in ammonium picrate. Five species of Dactylogyrus namely, Dactylogyrus mrigali D. chauhanusy D. yogendrai, D. labei and D. kalyanensis were recovered from sampled fishes. All the parasites were studied and re described, and reported for the first time from Bangladesh. The present investigation established Catla catla as a new host of D. Jabei.

Keywords: Monogenean fluke, Gill parasites, Indian major carps

Location: Mymensingh district.

Start Date: 00-00-2000

End Date: 00-00-2002

Program Area: Pest Management

Commodity: Carp fish

Objectives:

To investigate the presence of freshwater-monogeneans in indian major carps Labeo-rohita, Cirrhina mrigala, Carla catla and Labeo gonius in Mymensingh region

Methodology:

A total of 148 fishes of lndian major carps- 45 samples of Labeo-rohita 38 samples of Catla catla 38 samples of Cirrhina mrigala and 27 of Labeo gonius were collected from different fish farms and nurseries of Mymensingh district. Live fish were collected from BFRI (Bangladesh Fisheries Research Institute), Fish Seed Multiplication Farm, Maskanda and private fish farms of Shambhugonj, Digarkanda and Mymensingh. Only the Labeo gonius were collected from fish-traders of Shambhugonj. The collected fishes were carried live to the Fish Disease Laboratory by a water containing bucket. Fishes were then killed by a blow on the head. Both the opercula of the fish were cut by a scissors to remove the gills and dissected gills were placed in petridish containing clean water. Gills containing petridish was placed under dissecting microscope and observed the gill filaments to find out parasite. The live monogeneans were gently rubbed to dislodge from the gill filaments by the help of a bent needle and forceps. The monogeneans were removed and picked out by using a fine pipette to a small drop of water on a clean slide and covered with clean cover slip. Afterwards, a round circle was marked to confine the monogeneans by a marker pen. A small drop of ammonium picrate was introduced beneath the cover slip to fix and clean the worm. The comers of the cover slip were sealed with sialant to prevent it from moving. Preserved monogenetic trematodes were then studied under microscope and their size, shape and chitinoid structure were noted. Figures of the hard parts of flukes were drawn with the aid of a Camera lucida. Measurements were done with help of Oculomicrometer which was adjusted with stage micrometer and the microscope. For parasitic infestation ecological terms were used. All measurements are shown in millimeters unless otherwise stated.

Source of Information: Bangladesh J. Fish. Res., 6(1), 2002: 43-52

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Five species of Dactylogyrus namely, Dactylogyrus mrigali D. chauhanusy D. yogendrai, D. labei and D. kalyanensis were recovered from sampled fishes. All the parasites were studied and re described, and reported for the first time from Bangladesh. The present investigation established Catla catla as a new host of D. Jabei.

Knowledge Management: Journal