Aplicación de estrategias nutricionales y su efecto en el crecimiento en el cultivo continuo de Spirulina (Arthrospira platensis)

a continuous culture of spirulina (arthrospira platensis) was performed for 78 in a tubular photobioreactor of 300 l volume. during this period there was growth in biomass and crop response to the strategy of adding the nutrient medium. using as a basis the modified zarrouk medium, three nutritive combinations were elaborated: initial medium (mi), growth medium (sa1+sa2) and maintenance medium (sb1+sb2) for different crop stages. the media delivery is affected gradually and in accordance with requirements of growing biomass (dry weight) daily cultivation. the initial crop biomass was 2.0 g l-1, on day 20 of culture was made the first partial harvest (50%) starting a new stage of the crop with an initial biomass of 1.7 g l-1' 20 days after a second crop was partially culture initiating a third culture step with a biomass of 1.6 g l-1. the results obtained after harvest were, on the average, 3.7; 4.1 and 9.7 g l-1 respectively. the proximal analysis was performed at the end of the continuous cultivation showed a 71.6% of protein content.