2019-01-252019-01-251999Aquaculture Research 30 (11/12): 805-8141355-557Xhttps://hdl.handle.net/20.500.12348/2447Three major carp species, viz. catla Catla, Labeo rohita and mrigal Cirrhinus mrigala, are farmed in polyculture systems in the southern state of Andhra Pradesh, India. A survey of 189 carp farms was undertaken, and principal component analysis was used to assess the relationships between farm inputs and fish yield. Model results exhibited a strong relationship of yield with the stocking density of all three major carp species.application/pdfJournal Articlehttps://doi.org/10.1046/j.1365-2109.1999.00397.x