Culture des spores de Gracilaria gracilis (Stackhouse) M.Steetoft, L.M. Irvine Et W.F. Farnham, 2006 Et G. Bursa-pastoris (Gmelin) Silva, 1952, de la lagune de Bizerte

Abstract

This study has been carried out on the carpospores and tetraspores of the two seaweeds Gracilaria gracilis and G. bursa-pastoris collected in the Bizerte lagoon . Both types of spores were cultivated in laboratory conditions. Different irradiation levels and light / dark cycles were tested. The results showed that the highest growth of carpospores was recorded at 8:16 light/ dark cycle and 2000 Lux. While the best growth of tetraspores was obtained at 3600 Lux in G. gracilis and 2000 Lux in G. bursa-pastoris, the two at 8:16 photoperiod. These results showed some slight similarity of the two species but in the same time some differences in irradiance requirements. These differences are very important to take into account for the future cultures in a large scale.