Co‑production and biomass yield of amaranthus (Amaranthus hybridus ) and tilapia (Oreochromis niloticus) in gravel‑based substrate filter aquaponic Taofik Ademola Babatunde*, Kabir Ibrahim, Babangida Abdulkarim, Nasir Hassan Wagini, Sama’ila Adamu Usman, 10.1007/s40093-019-00297-5 Requires Subscription PDF downloads: 171