New Delhi, April 4: The Earth, from oceans to mountains, is filled with mysteries. One such enigma is the vibrant spectacle of phytoplankton blooms in the sea.
In June 2025, the waters of the North Sea near Scotland’s Shetland Islands suddenly transformed into a kaleidoscope of colors. This stunning display of greens and blues was due to a massive bloom of microscopic organisms known as phytoplankton. These tiny life forms are often invisible to the naked eye, yet their explosive growth can be detected from space.
NASA’s Landsat-9 satellite captured a remarkable image on June 13, 2025, showing a bloom that spanned approximately 160 kilometers. The satellite imagery revealed the water appearing green, with patches of blue and white.
According to scientists, the green hues were primarily caused by diatoms, a type of phytoplankton. Diatoms possess silica shells and contain high levels of chlorophyll. They thrive in the spring but can also appear during summer. The bloom also included coccolithophores, which have tiny plates of calcium carbonate that give the water a milky or turquoise blue tint. This species is common in the North Sea and had previously been observed along Scotland’s coast in 2021.
To understand phytoplankton better, it’s essential to know what they are. The term comes from the Greek words ‘phyto’ (plant) and ‘plankton’ (drifter). These microorganisms inhabit both saltwater and freshwater environments, including cyanobacteria, diatoms, dinoflagellates, green algae, and coccolithophores. Most are unicellular and, like terrestrial plants, they generate energy from sunlight through photosynthesis. They absorb carbon dioxide and release oxygen. Their growth requires sunlight, carbon dioxide, and nutrients like nitrates, phosphates, and silicates. Some species can even fix nitrogen. Under favorable conditions, their populations can explode, resulting in blooms that can cover hundreds of square kilometers and last for weeks, although the lifespan of each organism is only a few days.
Phytoplankton form the foundation of the marine food web. They are primary producers that provide sustenance for organisms ranging from tiny zooplankton to massive whales. Small fish consume them, and then larger fish prey on these smaller fish. They are also crucial for the environment, as they absorb carbon dioxide through photosynthesis.
When phytoplankton die, they sink to the ocean’s depths, where carbon can be stored for extended periods. This process aids in climate regulation. However, there are drawbacks. Some species produce toxins, leading to phenomena known as “red tides,” which can be harmful to fish and humans. After large blooms, the decay of dead organisms can deplete oxygen in the water, creating “dead zones” where other life cannot survive.
My name is Himanshu Tiwari. I am an experienced content writer with several years of expertise in the field. Currently, I contribute to Daily Kiran, creating engaging and informative content across a variety of categories including TECHNOLOGY, health, travel, education, and automobiles. My goal is to deliver accurate, insightful, and captivating information through my words to help readers stay informed and empowered.
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