Vegetative thalli of brown macroalgae K. alvarezii (153.3±24.0 g) were fixed on ropes (at depths of 0.00 to 0.90 m), and attached to floating tubes made of plastic foam and set up vertically inside 3 experimental grow-out cages (27 branches/cage). Seaweed wet weight was recorded at set up and at harvesting. Three set up/