Nestled beneath the tranquil surfaces of lakes and ponds, a hidden world awaits discovery – a world of lake balls. These unassuming aquatic plants, also known as marimo balls, hold a unique charm and ecological significance. In this article, we’ll delve into the fascinating realm of lakeballs exploring their biology, cultural significance, and the environmental benefits they bring.

The Marvel of Marimo:

Lake balls, scientifically known as Aegagropila linnaei, are a rare form of green algae found in freshwater habitats. Commonly referred to as marimo balls, these intriguing organisms form spherical colonies, creating a distinctive and visually captivating appearance. The name “marimo” is derived from a combination of two Japanese words: “mari,” meaning ball, and “mo,” a term for algae.

Biology of Lake Balls:

Marimo balls are unique in their structure and growth patterns. The spherical shape is a result of the continuous rolling motion caused by water currents. As the algae form a green outer layer, the inner core remains dormant, creating the spherical shape. The slow growth rate of marimo balls adds to their mystique, with some specimens taking several decades to reach a substantial size.

Lake balls are primarily found in freshwater lakes and ponds in colder regions, such as Iceland, Scotland, Japan, and parts of North America. They thrive in low-light conditions and are known for their ability to adapt to varying water temperatures.

Cultural Significance:

Marimo balls hold cultural significance in several countries, particularly in Japan. Considered a national treasure, marimo are protected by law in Japan, and the Akan National Park is home to the iconic Marimo Exhibition Hall. In Japanese folklore, marimo are believed to bring good luck and are often given as gifts to symbolize lifelong happiness and prosperity.

In Iceland, marimo are known as “kúluskítur” or “balls of poop” due to their appearance. Despite the humorous name, these algae are cherished and protected, with local communities recognizing their ecological importance.

Environmental Benefits:

Beyond their aesthetic appeal and cultural significance, marimo balls contribute to the ecological balance of their habitats. They absorb pollutants, such as nitrogen and phosphorus, helping to maintain water quality. Additionally, their slow growth rate aids in controlling algae blooms, preventing the overgrowth of competing species.

Conservation Efforts:

The popularity of marimo balls has led to increased demand, both in their natural habitats and as ornamental plants in aquariums. Unfortunately, this has put certain populations at risk. Conservation efforts are underway to protect and preserve the natural habitats of marimo, ensuring their continued existence for future generations.


Lake balls, or marimo, are not just charming aquatic ornaments; they are living organisms that play a vital role in the ecosystems they inhabit. From their unique biology to cultural significance and environmental benefits, these unassuming algae continue to captivate and inspire. As stewards of our planet, it is crucial that we appreciate and protect the delicate balance of nature, ensuring that these natural wonders thrive for years to come.