DESCRIZIONE
A bio-mass farming system comprises a plurality of repositories (3) for growing bio-mass and configured to be located offshore, and harvesting apparatus (1) configured to be located offshore and, at any one time, to harvest bio-mass from at least one but not all of the repositories. A method of bio-mass farming comprises the steps of providing a plurality of offshore repositories (3) for growing bio-mass; providing offshore harvesting apparatus (1); and harvesting bio-mass from at least one of the repositories while simultaneously leaving other repositories unharvested.