Stock Photo: ITALY, Adriatic Sea. Goro Lagoon, Po Delta. Equipped with an oxygen tank and a pump, this boat is oxygenating the lagoons waters to prevent the mussels from being killed by algae blooms. . During the summer, nutrient run off from farms and improperly treated sewage stimulate the growth of algae which absorb all available oxygen in the water. This kills all slow moving organisms.