This paper describes experiments to grow a local and still unidentified species of Gracilaria in shrimp hatcheries in Ecuador. The experiments used outdoor tanks of 1 and 18 m3 capacity, with continuous aeration and water renewal every two and five days, respectively. The sea water (salinity 34 ppt) was enriched with Guillard's f/2 medium; light and temperature were monitored but not controlled. One kg of fresh seaweed, inoculated into each tank, produced a biomass of ca. 3 kg in a period of 35 days in the 1 m3 tank and 18 kg in 43 days in the 18 m3 tank. We therefore believe that it is technically feasible to use the large infrastructure of existing shrimp hatcheries in Ecuador to produce Gracilaria.