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Laminaria was harvested for food and 1949 yielded 40.3 metric tons of dry weight. [9] Laminaria need cold water to survive and can only live above 36° N latitude. [citation needed] In 1949, the Chinese started to commercially grow laminaria as a crop. This increased the production of dry weight to 6,200 metric tons.
The species has been cultivated in China, Japan, Korea, Russia and France. [5] It is one of the two most consumed species of kelp in China and Japan. [1] Saccharina japonica is also used for the production of alginates, with China producing up to ten thousand tons of the product each year. [6] S. japonica contains very high amounts of iodine.
Saccharina is a genus of 24 species of Phaeophyceae (brown algae). It is found in the north Atlantic Ocean and the northern Pacific Ocean at depths from 8 m to 30 m (exceptionally to 120 m in the warmer waters of the Mediterranean Sea and off Brazil).
A strong stem secures the plant among sublittoral rocks, the stem can reach 0.5 meters in length, attached to a strong, fibrous holdfast. The blade of the plant is narrow and long, substantially so more than the stem. The blade of the Laminaria agardhii grows to be approximately 30 cm in width, and 3 meters in length.
Saccharina dentigera is a large brown seaweed growing to a length of 1.5 m (5 ft). The thallus is dark brown, thick and leathery, often appearing palmate because of being split into broad lobes to within 10 cm (4 in) of its base.
Gerasimenko, N.I.; Martyyas, E.A; Busarova, N.G (November 2012). "Composition of lipids and biological activity of lipids and photosynthetic pigments from algae of the families Laminariaceae and Alariaceae".
Laminaria digitata. Laminaria digitata is a tough, leathery, dark brown seaweed that grows to 2 or 3 metres (6 + 1 ⁄ 2 or 10 ft) long. The holdfast which anchors it to the rock is conical and has a number of spreading root-like protrusions called rhizoids.
Laminaria hyperborea is a species of large brown alga, a kelp in the family Laminariaceae, also known by the common names of tangle and cuvie. It is found in the sublittoral zone of the northern Atlantic Ocean. A variety, Laminaria hyperborea f. cucullata (P.Svensden & J.M.Kain, 1971) is known from more wave sheltered areas in Scandinavia. [2]