Algae

Algae are a diverse group of aquatic organisms that conduct photosynthesis. They range from unicellular microalgae, like phytoplankton and green algae, to multicellular forms, such as giant kelp and seaweed. Algae play a crucial role in aquatic ecosystems, providing the base for most marine food webs.

The scent profile of algae varies widely depending on their type and environment. Generally, algae emit a fresh, briny aroma that is often associated with the sea. Some types can have a more pronounced fishy or seaweed-like smell, especially when they decompose or when in dense blooms, which can produce unpleasant odors due to bacteria breaking down the algae. Freshwater algae tend to have a milder, earthy or muddy scent, influenced by the surrounding terrestrial vegetation and water quality.

Overall, algae's scent can be described as naturally oceanic, combining salty, briny qualities with varying degrees of earthiness and freshness, capturing the quintessential essence of marine and freshwater environments.