Threat to the World's Clearest Lake from Tourists with 'Lake Snot'

nelson lakes national park, new zealand - Rotomairewhenua, also known as Blue Lake in New Zealand, faces threat of losing its clarity due to increasing tourism and invasive algae.

Threat to Rotomairewhenua, the Clearest Lake in the World

Rotomairewhenua, located in Nelson Lakes National Park in New Zealand, is renowned as the clearest lake globally. Recently, its clarity is endangered by tourists and an invasive algae affecting its crystal-clear waters.

Also known as Blue Lake, this sacred site for indigenous people was historically used for spiritual rituals and considered a passage to the afterlife. The lake's azure blue water, fed by glacier meltwater, boasts a visibility of 70 to 80 meters, attracting hikers and nature enthusiasts.

However, the lake's popularity has surged in recent years, with visitor numbers doubling. The summer months from December to March witness a peak in tourism, with social media flooded by images of the lake and its stunning backdrop.

Environmentalists fear that the lake's increasing footfall may jeopardize its water clarity. They aim to prevent the spread of invasive algae, particularly Lindavia, commonly known as 'lake snot' due to the slimy layer beneath the water's surface, found in nearby lakes.

Ecologist Jen Skilton warns of the dire consequences if such microorganisms infiltrate Rotomairewhenua, emphasizing the need to maintain water quality and lake health.

Precautionary measures, including cleaning facilities and warning signs, have been implemented at lakes hosting the algae. Visitors are instructed to sanitize their gear before heading towards Rotomairewhenua to safeguard the lake's sanctity and ancient traditions.