Oxygen depletion occurs in a large part of the lagoon, but has been reduced since 2002 by creating larger openings around Aitoliko island and dredging channels in Messolongi Lagoon.
A significant portion of the lagoon suffers from low oxygen levels, yet this problem has been somewhat alleviated since 2002 through the creation of larger openings around Aitoliko island and the dredging of channels in Messolongi Lagoon.