Scientific name: Laminaria japonica.
Kelp is a seaweed that is larger in size, softer in texture, delicious in texture, and has higher nutritional value and economic value among coastal plants. Not only does it contain iodine content as high as 0.2-0.4, it can be used as medicine, but it is also an excellent seafood vegetable. Each hundred grams of dried kelp contains 0.57 mg of carotene; 0.09 g of vitamin B1; 0.36 mg of vitamin B2; 1.6 mg of niacin; 8.2 g of protein; 0.1 g of fat; 57 g of sugar; 12.9 g of inorganic salt; 2.25 g of calcium; Iron 0.15 grams; crude fiber 9.8; calories 262 kcal. Kelp is an industrial raw material with high economic value, especially the sugars, alginic acid, mannitol, etc. contained in it.
Kelp is native to the Bering Strait and Hokkaido, Japan, and is also cultured in sea areas such as Shandong and Dalian in my country. In 1958, the company moved south to Fujian Province and succeeded in trial breeding. It broke through the difficulties of artificial kelp seedlings and summer transition in sea areas and indoors, and cultivated mature kelp species for productive seedlings and large-scale cultivation.
The length of kelp algae is generally 2-3 meters, the maximum length can reach 5-6 meters, and the width is about 20-30 centimeters. The algal body is divided into three parts: fixator, stalk and blade. The retainer is located at the base of the handle and consists of many cylindrical rhizoids, with suction disks at the ends of the rhizoids. The handle is cylindrical when young, with a smooth and dark brown surface. When it grows into an oblate shape, it is generally 5-6 cm in length. The leaves are band-shaped, unbranched, brown and shiny, with a "middle band" formed in the middle of the leaf.
The suitable temperature range for the growth of kelp is 1-25℃, and the optimal temperature is 5-10℃. When the water temperature rises to 15-20℃, sporangia appear on the leaves of the algae. Light is one of the main factors affecting kelp growth. The nutrient content of nitrogen in seawater also affects the output of kelp aquaculture production. It is required that the nitrate nitrogen content in the aquaculture area must be above 20 mg/cubic meter. In addition, tides and wind waves also have a great impact on the growth of kelp