A cultivation system for micro-algae comprises of closed bioreactors 2 made by heat sealing together two sheets of plastic to create a flat tube with an entry 1 and exit 4 pipe allowing circulation 3 of algal culture. Each bioreactor may comprise a plurality of tubes. A plurality of bioreactors may be connected together by means of springs, elastic rope, dampers 5 etc. The algal culture flows through the system and then maybe transferred to a settlement / filtration system where continuous harvesting may take place. The system may be utilised by floating on a body of water such as lakes or seas or may be used on reasonably level ground. The system may be rolled up for manual deployment on land or mechanical deployment by boat.
