Authors : Reena R. Laharia and Paresh R. Patel
Page Nos : 144-152
Description :
Fish disease is a substantial cause of monetary loss to aquaculturists. In nature we are less aware of fish disease problems. Biological infectious agent is the primary cause of EUS. Epizootic Ulcerative Syndrome (EUS) causes severe ulceration and heavy mortalities of fish in the wild & culture ponds. Daily observation of fish behavior & feeding activity helps early detection of problems. In the present study fish behavior & appearance of the control, naturally affected & artificially infected fishes after 7, 14 & 21 days of Challenge infection was observed. Naturally affected fishes, exhibited sluggish movement, abnormal feeding, occasionally visiting to surface of water for oxygen along with red ring at several places on the body. Artificially EUS infected fishes after 7 days, also showed sluggish movement, abnormal feeding, normally stretched fins and red spots on body. After 14 days they mostly remained at the bottom, and seen coming to the surface after a long time, slow beating of the operculum, ate less food, showed vertical–diagonal movements and red spot with circular ring & collapsed fins. After 21 days they remained at the bottom in the corner of the aquaria, stopped feeding, the skin was found to be necrosed & showed some mycelia, scales were lost from the ulcerated area of the body, as compared to the normal behavior of control fishes.
