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Effects of Caryophyllaeid Cestode Infestations on Clarias Batrachus (linn.)

N.N. LABONI
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

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

M.S. CHHANDA
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Abstract/ Executive Summary:

Effects of caryophyllaeid cestode infestations on Clarias batrachus was conducted during the period from August 2010 to July 2011. Fish samples collected from K.R. market, BAU campus came from various waterbodies. Sex, total length (ern), standard length (ern), head length (ern) and weight (g) were recorded. Five different species of caryophyllaeid namely Djombangia penetrans, Lytocestus indicus, L. birmanicus, L. parvulus and Bovienia serialis were identified from the host. Severe infestations of caryophyllaeid cestodes were found in C. batrachus. Changes in the nature of growth and loss of weight as a result of parasitic infestation were noticed. Accordingly length, weight and condition factors were found to be greatly affected. Loss of total length ~8.73%) and the highest loss of mean head length (4.49%) were found in smaller infested length group fish. Loss of weight (1.63%) and the highest percentage loss of weight (26.38) were noticed in the small length group while it was 7.44 in large length group. The highest condition factor (1.13) was found in uninfected fish and lowest (0.85) in infested fish. Suggestions were made for further investigation on blood composition and gonadal development of infested host.

Keywords: Clarias batrachus, Parasitic effect, Length, Weight, Condition factor

Location:

Start Date: 00-08-2010

End Date: 00-07-2011

Program Area: Pest Management

Commodity: Cat fish

Objectives:

To evaluate certain effects on length, weight and condition factor of C. due to caryophyllaeid infestations.

Methodology:

A total of 222 host fish namely Magur (Clarias batrachus)was collected and used as the experimental fish. Sampled fish were examined to investigate the effects of parasitic infestation on host during the period from August 2010 to July 2011. The entire study period was divided into four seasons: Summer (March - May), Rainy season (June -August), Autumn (September - November) and Winter (December - February). Live and fresh fishes were collected from K.R. market, Gouripur, Sutiakhali and. Churkhai. Almost all these fishes were brought to these markets after collection from Kailla Beel (a very big beel) of Ishwarganj Upazila of Mymensingh. Besides these fishes,few collections were also made from local fish markets around BAU, Natun bazar and Mechhua bazar of Mymensingh town. The fishes were brought to the fish disease laboratory of Aquaculture Department in polythene bags or bucket with water in live condition for parasitic investigation. Before investigation the source of the fish was recorded in a data book, the total length (TL), standard length (SL), head length (HL), weight and sex of the fishes were recorded.The total length of each fish was taken from the tip of the lower jaw to the tip of thelower lobe of the caudal fin. The head length has taken from the tip of the lower jaw tothe operculum while the body length, from the operculum to the tip of the lower lobe ofthe caudal fin. The method adopted by Desbrosses (1948) was followed to find out the . relationship between the head length and the total body length. The formula 100xIt/X , where 1 t = the length of the head and X = the total body length, was applied for all the fishes. The fishes were classified into different length groups. The average length and weight of un infected and infected specimen, belonging to each group were categorized.The loss of weight was then calculated by deducting the average weight of infested fishby caryophyllaeid cestode from that of uninfested fish. Then percentage loss of weightwas calculated. Based on the intensity of attack, hosts coming under different lengthgroups were categorized and the percentage loss of weight was calculated. Conditionfactor was employed to evaluate the effect of parasite on the host.

Source of Information: J. Asiat. Soc. Bangladesh, Sci. 38(2): 135-144, December 2012

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Among 222 examined, 186 C. batrachus were infested with 1428 caryophyllaeid cestode.They belonged to five different species, Djombangia penetrans, Lytocestus indicus, Lytocestus birmanicus, Lytocestus parvulus and Bovienia serialisas identified byChhanda et at. (2011). The overall prevalence was recorded 83.78%, mean intensity 7.78and abundance 6.43. Maximum number of caryophylaeid cestode parasites in a singleinfested host was 151. The infested host fishes were found to be infested by multiplespecies dominated by D. penetrans. Though there are reports of digenean and nematodeparasitic infestations in C. batrachus (Arthur and Ahmed 2002) only caryophyllaeidcestodes were found in the present investigation. It could be interested if the study couldbe concentrated on the effect of parasitism of a single parasitic infestation. Not only thecase of C. batrachus, it is true for other host fishes as they have multiple infestations by anumber of parasite species even by different groups parasites (Natarajan and Nair 1977and Agarwal 1985, Chandra and Golder 1987). However, Kabata (1958) and Mann(1964) observed the biology and its effects of single parasite on the host fish which wasnot possible in the case of C. batrachus.

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