Seaweed in English seaweed.

Seaweed is the only class of higher angiosperms on earth that can live entirely in seawater. There are more than 70 species of seagrass known globally, belonging to 6 families and 13 genera; China has 22 species of seagrass, belonging to 4 families and 10 genera.

China's seagrass distribution area is divided into two regions: the South China Sea seagrass distribution area and China's Yellow Bohai Sea seagrass distribution area. The South China Sea seagrass distribution area includes the coasts of Hainan, Guangxi, Guangdong, Hong Kong, Taiwan and Fujian.

The Yellow Bohai Sea seagrass distribution area includes the coasts of Shandong, Hebei, Tianjin and Liaoning. These two seagrass distribution areas belong to the Indo-Pacific tropical seagrass distribution area and the North Pacific temperate seagrass distribution area, respectively, as classified by Short et al. (2007).

Seagrasses originated from terrestrial angiosperms and most of them evolved from the same angiosperms seventy million years ago and re-entered the ocean millions of years ago to develop their own unique habits, which creates a clear distinction between them and other plant groups migrating into marine ecosystems such as salt marsh plants, mangroves and algae.

Seagrass applications:

Because seagrasses are relatively homogeneous and they have long lived on the bottom of the ocean where they are invisible to the naked eye, historically seagrasses have not been closely linked to humans, but as researchers have shifted more and more of their attention to the earth's oldest species over the past 100 years, seagrasses have gradually come into the public eye and have become closely linked to human life. relevant to human life.

First of all, seagrass has already been utilized in fishery production. Because seagrass contains a large amount of edible alginate, starch, mannitol, and potassium, sodium, chlorine, magnesium, manganese, iron, cobalt, and a large amount of iodine and other macronutrients required by living organisms, the composite fertilizers with dahlias as the main ingredient have already become the bait that can't be substituted for the bait in the aquaculture of sea urchins and sea cucumbers.

Recently, attempts to apply seaweed in livestock breeding with a view to improving livestock's disease resistance, growth rate, meat quality and so on have also been gradually carried out. Secondly, seagrass hay, especially macroalgae and shrimp seaweed genus seagrass hay, with corrosion resistance and heat preservation and durability, often processed as weaving, sound insulation and heat preservation materials.