A water biology expert has identified sea lettuce, a marine plant, as the cause of color changes and unpleasant odors in some waterways in Prince Edward Island. Sea lettuce, a type of algae, naturally thrives in marine environments under high-nutrient conditions. As it decomposes, the organic material consumes oxygen in the water, leading to what is known as an anoxic event.
Several discolored waterways, including an estuary in the Oyster Bed area of P.E.I., have been reported to provincial authorities. The Department of Land and Environment noted that the green and grey-white color change in the estuary on July 9 was linked to low dissolved oxygen levels.
Monitoring of oxygen levels in various waterways, including the one in question, is conducted annually by the province. Collaborating with Fisheries and Oceans Canada, the department plans to review oxygen data trends from monitored estuaries over the past decade.
The expert advised caution for those suspecting anoxic conditions in water bodies, suggesting avoiding contact as it may result in a lingering smell of rotten eggs. While some wildlife have adapted to low oxygen levels, many marine species struggle to cope with such conditions. Concerned individuals can report waterway issues to the Land and Environment Department for investigation.
