PREVALENCE OF OVARIAN PARASITIC NEMATODE INFESTATION OF FISHES OF PARANGIPETTAI COAST

The parasitic nematode Philometra sp infect in the economically important fish ovary of Otolithes ruber and Terapon jarbua respectively. Here we report new information on these themes from assessments of infected and non-infected hosts collected from Parangipettai different landing center in 2018. Otolithes ruber, the maximum (65 %) prevalence of parasitic infestation was observed during premonsoon 2018 in Parangipettai. Whereas minimum (17%) was during the postmonsoon 2018 in Parangipettai. The higher (9) mean intensity of parasitic infestation was noted during postmonsoon 2018 in Parangipettai, whereas minimum (2.7) was during summer 2018 in Parangipettai. Terapon jarbua, the maximum (98 %) prevalence of parasitic infestation was observed during summer 2018 in Parangipettai. Whereas minimum (27%) was during premonsoon 2018 in Parangipettai. The higher (12.5) mean intensity of parasitic infestation was noted during postmonsoon 2018 in Parangipettai, whereas minimum (7.8) was during monsoon 2018 in Parangipettai. Light microscopy describe the worm having anterior end, posterior end, oral aperture circular large, surrounded by cephalic papillae. Buccal cavity, esophageal, intestine brown, straight, ending blindly; anterior end of intestine relatively narrow; Posterior end of intestine atrophied. Scanning electron microscopy were showed cephalic end rounded, cephalic papillae unclear, oral aperture, cephalic papillae arranged in two circles, lateral amphids; internal circle of papillae consisting of four larger submedian and two minute lateral single papillae, whereas external circle formed by four submedian pairs of papillae. Posterior end attached by short ligament ventrally to body wall near caudal end, anus present. The histopathology showed ovary tissue savior damage in to ova of yolk degenerated, nematode tissue accumulation in host egg mass, lateral hypodermal cords were bands, presents of Langhans-type giant cells and necrotized nematode tissues surrounded by proteinaceous matrix.