Common name: gulf weed

General information

Sargassum natans, commonly known as Floating Sargassum or Gulfweed, is a species of brown algae that is part of the Sargassaceae family. This free-floating seaweed is well-known for its role in creating the unique Sargasso Sea ecosystem in the Atlantic Ocean. Unlike most seaweeds that are anchored to the ocean floor, Sargassum natans drifts with ocean currents, forming large mats on the surface of the water that provide habitat for a diverse range of marine life.

Care

In the aquarium, Sargassum natans can be a fascinating addition to a refugium, where it can help with nutrient export by absorbing excess nitrates and phosphates. It requires moderate to high lighting and some water movement to mimic its natural environment. Regular pruning is recommended to maintain its size and to prevent it from overtaking the tank.

Symbiosis

Sargassum natans is known for its ecological importance, providing shelter and food for a variety of marine species, including juvenile fish, crustaceans, and sea turtles. In the aquarium, it can host small invertebrates and provide a natural feeding ground for herbivorous fish.

Habitat

Naturally found in the warm waters of the Atlantic Ocean, Sargassum natans is a pelagic species that prefers the open sea. It is often associated with the Sargasso Sea, where it contributes to a unique floating habitat that supports a rich biodiversity.