Green Algae Overgrowth on Breakwater in Qingdao Raises Environmental Concerns

On June 4, 2025, visitors to Qingdao's Victoria Bay were met with an extraordinary sight as the nearshore breakwater was blanketed in a thick layer of vibrant green algae. The algae, thriving after recent rises in temperature and seawater warmth, transformed the stony structure into what many described as a "green coat" stretching along the seafront. The vivid display followed the natural ebb and flow of the tides, which left the algae exposed and visible following the receding waters.

This seasonal surge in green algae is closely linked to the region’s warming waters at the onset of summer. Marine biologists note that these conditions create a highly favorable environment for algae blooms, which can proliferate rapidly under sunlight and elevated temperatures. While such occurrences are considered part of the local ecological cycle, the sheer density observed this week has prompted both curiosity and caution among residents and tourists alike.

Locals say the algae are typically harmless, though they can be slippery and may obscure the jagged rocks beneath. Authorities have reminded beachgoers to exercise caution around algae-covered breakwaters, especially during low tide when the rocks are fully exposed. Children and the elderly have been advised not to climb onto the breakwater due to the risk of falls.

Experts also point out that while algae blooms are generally natural in moderate amounts, excessive growth over extended periods can indicate changes in water quality or nutrient levels. They are monitoring the situation closely for any signs of abnormal expansion or environmental impact. For now, the algae-coated breakwater has become a fleeting yet eye-catching feature of the early summer seascape in Qingdao, attracting photographers, nature enthusiasts, and curious onlookers hoping to glimpse the vivid green transformation before the tides rise again.