VANKARA, A. P.; MODI, A. K. GILL COMMUNITY STRUCTURE AND SPATIAL ALLOCATION OF CICHLIDOGYRID MONOGENEAN PARASITES ON THE GILLS OF Oreochromis Niloticus (LINNÉ, 1758) OF YSR DISTRICT, ANDHRA PRADESH, INDIA. UPJOZ 2021, 41, 72-85.