Special species: Vaucheria

Filamentous algae are those thin fussy-looking, sometimes slimy, algae may find growing on hard substrates where they cover rocks and stones.

Some of them though grow on soft bottoms. Examples of these algae that specialize in growing on soft sediments are species of the genus Vaucheria. Vaucheria are yellow-green algae that grow long, tube formed and unbranched filaments that often can be seen growing straight up from the soft sea bottom like green spiky hair.

Vaucheria covering the bottom, giving it a green “fur”. Photo by Petra Pohjola, County Administrative Board of Norrbotten.

In some places the algae grow so abundantly that it looks like a green mat covering the whole sea floor. There gas can accumulate underneath the dense vegetation, forming gas pillars in the Vaucheria-mat, as seen in the video.

The video is taken during a free dive to a depth of about 2,5m, in a shallow bay where the bottom at the deepest part was covered by these algae.

Written by: Petra Pohjola, County Administrative Board of Norrbotten

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s