DOI: 10.36347/sajb.2020.v08i11.004

Pages: 360-370

Characterization and knowledge of the quantity of wild macroalgae stock available per season is necessary to allow the carrying out of a seaweed and exploitation project. The measurement of the quantity of seaweeds on the North coast was undertaken by the method of transects and quadrats. The inventory was carried out between 2017 and 2019 at 5 sites located on the said coast. In each site we have used Google Earth and the Arc Gis software predetermined 3 transects of 500 m each distant from 500 m to each other, arranged perpendicular to the coast. On each transect, sampling points spaced 50 m from each other with their coordinates have been pre-established. At each sampling point, 3 quadrats were fixed and the algae are harvested and identified. In this area, Ceramium rubrum var. pacificum is the most frequent species (5.8% of the quadrats) and the most abundant but the Meristotheca senegalensis has the most important biomass with 1682 grams in 2017 and 1170 grams in 2018 harvested for each season in an area of 49,5 m2.