A water biology expert on Prince Edward Island attributes the color and odor changes in some waterways to sea lettuce, a marine plant. Kyle Knysh, a provincial surface water biologist, explained that sea lettuce, a type of algae, thrives in high-nutrient environments. As it decomposes, organic material consumes oxygen, leading to an anoxic event in the waterways.
Several discolored waterways, including an estuary in the Oyster Bed area, have been reported to the province this year. The Department of Land and Environment confirmed a report on July 9 of green and grey-white water in the estuary, indicating low dissolved oxygen levels.
The province routinely monitors oxygen levels in various waterways, collaborating with Fisheries and Oceans Canada to analyze trends over the past decade. Knysh advised caution for individuals suspecting an anoxic water body, suggesting avoiding contact to prevent the smell of rotten eggs on skin.
While some wildlife has adapted to low oxygen conditions, many marine species struggle with such environments. Knysh highlighted the importance of oxygen for aquatic life, emphasizing the need to move away from affected areas to survive. Concerned individuals on P.E.I. are urged to contact the Land and Environment Department for investigations into waterway conditions.