*2.3. Green Seaweeds*

The majority of the species are aquatic, living in both freshwater and marine habitats. The green color of these algae is due to chlorophyll-a or chlorophyll-b. Some of them are terrestrial, meaning they grow in soil, trees, or rocks. Ulva is one of the most common green seaweeds. *Ulva*, *Cladophora*, *Enteromorpha*, and *Chaetomorpha* are the most common genera. Green algae thrive in regions with lots of light, including shallow waterways and tide pools. *Ulva* sp. has a high protein content (typically > 15%) and a low energy content and is abundant in both soluble and insoluble dietary fiber (glucans) [26]. The main types of seaweeds are shown in Figure 1.

**Figure 1.** Three example species of brown (**a**) red (**b**) and green (**c**) seaweeds. Adapted from ref. [14] obtained from mdpi journals.
