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Index Category
Num Date Index Chg. Chg. %
1 2012-12-02 98.67 -2.44 -2.48%
2 2012-11-25 101.11 2.22 2.20%
3 2012-11-18 98.89 1.89 1.91%
4 2012-11-11 97.00 0.44 0.46%
5 2012-11-04 96.56 -3.89 -4.03%
6 2012-10-28 100.44 0.67 0.66%
7 2012-10-21 99.78 1.11 1.11%
8 2012-10-14 98.67 0.00 0.00%

特徴

産地:There are many types of laver. Bred porphyra haitanensis can be found In Fujian and southern Zhejiang coast, while in northern coast of China, porphyra yezoensis is bred. Lavers are harvested from time to time whenever the length is about 15~20 cm. the harvest season is from late Autumn to March and May of the following year.
Porphyra is a coldwater seaweed that grows in cold, shallow seawater. More specifically, it is a foliose red algal genus of laver, comprising approximately 70 species. It grows in the intertidal zone, typically between the upper intertidal zone and the splash zone in cold waters of temperate oceans. In East Asia, it is used to produce the sea vegetable products nori (in Japan) and gim (in Korea). There are considered to be 60 to 70 species of Porphyra worldwide and seven in the British Isles.
特徴:Lavers have simple appearance with holdfast, stalk and leaf. The leaf is membranous, composed of 1 layer of cells (a few species composed of 2 or 3 layers). Its length varies among different species, ranging from several centimetres to several metres. The leaf contains rich chlorophyll, carotenoids, lutein, phycoerythrin and phycocyanin pigments. Different proportion of pigments result in different kinds of laver with different colors such as red-violet, blue-green, reddish brown, brown, green and other colors, but purple is the most dominating. That’s why it is called Zicai in Chinese (Purple Vegetable). Laver's life has 2 total phases: a larger thallus (the gametophyte phase) and tiny filaments (the Sporophyte phase). Thallus has the function of sexual reproduction, nutrition cells transform into female and male cells respectively, after fertilization, female cells start fission repeatedly to form fruiting spores, when spores are mature, they will leave the laver to water. Then they will be attached to calcareous substrates like shells, then germinate and get into the shell to grow as water flows. Then they will grow to filaments. After a certain period, filamentous will grow to produce sporangial branchlets, which will split to form spores. The released spores will attach themselves to rocks, artificial posts or net curtain and will directly germinate to fronds. In addition, certain types of fronds can also reproduce asexually from vegetative cells into a single spores. Single spores are also one of the most important seed sources in laver breeding.
Most human cultures with access to Porphyra use it as a food or somehow in the diet, making it perhaps the most domesticated of the marine algae, known as laver, nori (Japanese), amanori (Japanese), zakai, gim (Korean),[8] zicai (Chinese), karengo, sloke or slukos. The marine red alga Porphyra has been cultivated extensively in many Asian countries as an edible seaweed used to wrap the rice and fish that compose the Japanese food sushi, and the Korean food gimbap. In Japan, the annual production of Porphyra spp. is valued at 100 billion yen (US$ 1 billion).