Algal Growth Around Kerkennah Islands, Tunisia34.7N 11.0E
The shorelines of the eastern coast of mainland Tunisia, the island of Djerba (below center) and the Kerkennah Islands (top center) appear very sharp in contrast with the dark waters of the Gulf of Gabès (left) and the Mediterranean Sea.
Upon closer examination, the dark blue sea waters also appear to contain some dark green algae, particularly around the Kerkennah islands and along the coast east of Djerba.
Two species of the green algae are considered as invasive in Tunisia and are found in many places along the central and southern Tunisian coast, and even in the North of the country in colder water. These species are frequently encountered around the Kerkennah Islands.