A method suitable for commercial aquaculture, the method comprising the steps of: (a) at least partially filling a tank ( 3 ) with an aqueous medium ( 13 ), the tank ( 3 ) being adapted for control of the quality of the aqueous medium ( 13 ), (b) locating one or more supports ( 2, 4 ) in the tank ( 3 ), each support ( 2, 4 ) being adapted to vertically hold multiple cells ( 1 ) containing marine or fresh water organisms, (c) removing one or more supports ( 2, 4 ) from the tank ( 3 ) to harvest the marine or fresh water organisms wherein a cell ( 1 ) is a self-contained unit including a barrier such as a wall to enclose marine or fresh water organisms in a volume of aqueous medium ( 13 ) and includes one or more apertures or interstices to facilitate free flow of the aqueous medium ( 13 ) between the interior and exterior of the cell ( 1 ). Each cell ( 1 ) further includes a port for insertion of the marine or fresh water organisms, the port being blocked or restricted when the cell ( 1 ) is held by the support ( 2, 4 ).
