Bull Kelp

Description:

Durvillaea potatorum is one of the larger seaweeds, able to exceed 10 meters in length and weigh more than 75 kilograms (wet weight). Commonly known in Australia as bull kelp (a name used for several large kelp species in different parts of the world), this brown algae has a robust, flat thallus that arises from a large, strong holdfast. Leathery fronds are divided laterally along the length of the stipe into long, wide leafy blades. Durvillaea potatorum makes a very productive crop. It is long lived, exceeding 14 years, and can grow at a rate of 10 to 14 centimeters a day during summer months. Source: Seaweed Industry Assoc.

Habitat:

Seen in the southern hemisphere from southeast Australia to subantarctic regions. This was washed ashore along the beach of Bass Strait.

Notes:

Extracts of this brown algae is used in several products - medicinal, food, cosmetic and fertilizer. has been used by indigenous australians for crafting baskets. Only fresh specimens can be processed so they are collected as soon as they are washed ashore. I am always amazed by the tough leathery texture of the broad leafy thallus.