Ecklonia bicyclis), sea oak is a species of kelp, of the brown algae, best known for its use in Japanese cuisine.

Eisenia bicyclis is indigenous to temperate Pacific Ocean waters centered near Japan, although it is deliberately cultured elsewhere, including South Korea.

Two flattened oval fronds rise from a stiff woody stipe which can be up to about 1 metre (3.3 ft) tall.

[1] It is added to appetizers, casseroles, muffins, pilafs, soups, toasted dishes, and many other types of food.

[2] Arame is high in calcium, iodine, iron, magnesium, and vitamin A as well as being a dietary source of many other minerals.

"Ecological Half-Lives of Radiocesium in 16 Species in Marine Biota after the TEPCO's Fukushima Daiichi Nuclear Power Plant Accident".

Paudel, U; Lee, Y-H; Kwon, T-H; Park, N-H; Yun, B-S; Hwang, P-H; Yi, H-K (August 2014).