Author(s): Archana Prasad, Sahendra Yadav and Jash Hang Limbu

Abstract: This study was carried out at Fishery Development Center, Bhairahawa, Nepal between pre-monsoon and post monsoon. Altogether 60 live host fishes (30 pre and 30 post monsoon) were examined. Total 60 fish samples were divided in 3 groups, 20 were small (<18 cm), 20 were medium (18-28 cm) and 20 were larger (>28 cm) in size. During study period total 321 parasites were recorded from 28 fish samples. Among them two protozoans (Trichodina, Ichthyophthirius multifiliis), two monogeneans (Dactylogyrus, and Gyrodactylus) and two crustaceans (Argulus and Lernaea) were collected from skin, mucus, fins and gills. Prevalence, intensity and abundance of parasites were analyzed. Silver Carp were more susceptible to infection then Common Carp. The number of Dactylogyrus ssp. Was highest (57%) and Gyrodactylus spp. Was lowest (0.6%). Prevalence, intensity and abundance of fish parasites were found to be related to different length group of the host. The high prevalence (75%) was recorded from small fishes. However, highest mean intensity (21.87%) and abundance (8.8%) of parasites were recorded in large fishes. The highest prevalence (63.33%), mean intensity (20.41%) and abundance (9.73%) of parasites were recorded pre-monsoon.

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