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Histopathological Studies of Pond Reared Indian Major Carp, Catla catla Infested with Argulus japonicus and Trial for Argulosis Treatment

Histopathological Studies of Pond Reared Indian Major Carp, Catla catla Infested with Argulus japonicus and Trial for Argulosis Treatment

Md. Abdullah Al Mamun1,2*, Shamima Nasren1,3, Sanjay Singh Rathore1 and Kavalagiriyanahalli Srinivasiah Ramesh1

1Laboratory of Aquatic Animal Health Management, Department of Aquaculture, College of Fisheries, Mangalore-575002, Karnataka Veterinary Animal and Fisheries Science University, Karnataka, India.
2Department of Fish Health Management, Sylhet Agricultural University, Sylhet-3100, Bangladesh.
3Department of Fish Biology and Genetics, Sylhet Agricultural University, Sylhet-3100, Bangladesh.
Corresponding Author: Md. Abdullah Al Mamun


Indian major carp, catla (Catla catla) that showed erratic and lethargic movement were collected from College Fish Farm, Mangalore. We examined a total of 20 catla, found all the fish infested with fish louse, firmly attached to the skin, fins, head, and operculum. Based on the morphology of the specimens, the parasites were identified as Argulus japonicus. Moribund fishes were examined and up to 350±50 lice were hand-picked from a single fish. Microscopic examinations of A. japonicus revealed that most of these were at juvenile stages. Infested fish were transferred to the glass aquaria (60 L) and treated with 4 treatments for 15 days: I) Potassium permanganate II) Aquarium salt III) Formalin and IV) Mechanical. The significant lower (P<0.05) parasitic burden were found in mechanical treatment followed by salt, formalin and potassium permanganate. Clinical signs like excessive mucus production, fin erosion, pale gills, and slight hemorrhage were observed in the affected area of skin and operculum. Among the internal organs, liver lost its original reddish-brown and turned to yellowish-brown, intestinal duct remained empty and swelled. Severe infestation in catla caused eye opacity and tail rot indicated the devastating effects of A. japonicus. Infestation by this parasite resulted in histopathological changes in the skin and muscle, gill, liver, kidney, heart and different parts of gut tissues. According to the results obtained in the present study, it can be suggested that acute infestation of A. japonicus elicited direct effects such as eye opacity, fin rots, scale loss and severe histopathological alterations in catla. 


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Pakistan Journal of Zoology


Vol. 53, Iss. 5, Pages 1603-2000


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