I was in complete awe of the sunlight peaking through the small holes among the sea of sargassum. Before me, playing among the sargassum, her features barely visible, a female sperm whale clicked and rolled around amicably. I wasn’t sure if she was seeking shelter beneath the sea of sargassum seaweed, a moment away from the sunlight or distancing herself from the whale-watching boats. Maybe none of those reasons, maybe all of them.

Shortly after that momentous dive, I wanted to find out more. As I lay there, underwater on one breath, I wondered what role the sargassum played in the lives of the resident sperm whales of Dominica. Watching her, her eyeing me, aware of my presence, intrigued and knowledgeable of everything in my human composition.

The sargassum seaweed belt is a vast expanse of floating seaweed that stretches across the Atlantic Ocean. It is named after the Sargasso Sea, a region in the North Atlantic Ocean where the seaweed accumulates due to ocean currents and wind patterns. Sargassum seaweed belongs to a genus of brown algae, and it plays an essential role in marine ecosystems. It provides habitat, shelter, and food for various marine organisms, including fish, turtles, and birds. The seaweed belt is particularly known for its significance as a nursery area for many species, offering protection for the early stages of their life cycles.

In recent years, there has been an increase in the size and frequency of sargassum seaweed blooms, leading to concerns and challenges for coastal communities and ecosystems. The excess seaweed can wash ashore, accumulating in large amounts and causing problems such as beach erosion, hindered tourism, and negative impacts on marine life when it decomposes. The factors contributing to the increased blooms are still being studied, but some potential causes include nutrient runoff from land, changes in ocean temperature and currents, and shifts in atmospheric conditions. These factors can promote the rapid growth and spread of the seaweed.