Weihai is China's largest kelp breeding base. It is affected by the specific natural environment such as water temperature and climate. Compared with the kelp produced in the southern coastal areas, Weihai kelp has thick algae and the highest content of alginate, mannitol and iodine. China's domestic iodine industry, seaweed chemical industry's preferred raw materials, has a very significant geographical advantage. "Weihai kelp" products have superior quality, longer temperature period than common kelp, large pigmentation, good dry color, large algae skirt, anti-corrosion. It also contains a lot of vitamins and trace elements. It has the functions of lowering blood fat, lowering blood pressure, lowering blood sugar, resisting tumor and preventing cancer, as well as various health care functions such as delaying aging, beauty, puzzle and health. It is a marine pure green food with great nutritional and health value.

[Place of Origin] Weihai is a temperate monsoon-type Haiyang continental climate with four distinct seasons, mild and warm, and sufficient light. The production area is dominated by sediments, with large currents and small winds, especially the warm and upwelling of the Yellow Sea and the cold water of the Yellow Sea. The group provides extremely favorable growth conditions for the growth of kelp, and it has no agricultural and domestic water discharge, and the nutrient salt content is extremely high. No artificial fertilizer is needed in the aquaculture production, which can fully satisfy the kelp in a pollution-free natural environment. Growing, all of which create unique natural conditions for the development of seaweed farming. [Quality characteristics] "Weihai kelp" products have superior quality. Compared with ordinary kelp, it has a long warm period and large pigmentation. The dry color is good and the algae skirt is wide and resistant to decay. It also contains a lot of vitamins and trace elements. [Eating method] Generally used for stewing soup and cold salad, it can also be used for braised and porridge. Taomi blister kelp makes kelp easier to soften. [Eating taboos] 1. Do not drink tea immediately after eating kelp (tea contains tannic acid), and do not immediately eat sour fruits (sour fruits contain plant acids). 2. Patients with hyperthyroidism should not eat kelp. 3, pregnant women and lactating mothers do not eat more kelp. 4, kelp can not be soaked for a long time, generally speaking, soaking for about 6 hours can be. 5. Patients with hyperthyroidism should not eat kelp. 6, the coastal high-iodine areas should try to eat less kelp. [Optional skills] 1, color. Normal kelp is brownish green. 2, smell the taste. In addition to the faint natural seafood taste in the sea, there is no pungent smell, and some are very likely to be soaked in chemicals. 3, pinch a pinch. The kelp with the right hardness is better and fresher. 4. Look at the thickness. Choose a moderately thick kelp. [Storage method] Store in a dry place. [Recommended recipe] Tofu seaweed soup, kelp duck soup, kelp braised pork, kelp glutinous rice porridge, pork skin kelp, black bean kelp oxtail soup, kelp raw soup, spicy mixed kelp sprouts

Weihai kelp quality technical requirements (a) varieties. Shanhai No.1, Shanza No.10, Yuanza No.10, Ronghai No.1, Rongfu, 901, Japan Sea kelp. (2) Environmental conditions. There is no urban sewage, industrial sewage and freshwater discharged into the river within the scope of protection. The water quality should meet the requirements of GB/T 11607 and NY 5052. Temporary environment: small winds and waves, smooth flow, fertile water, transparency of 1m to 3m, the inner bay of the inner bay with less floating algae. Develop the environment: the bottom is a flat mud bottom or a silt bottom, and the soft mud bottom is also acceptable. The flow rate of the current is between 0.17 m/s and 0.7 m/s, preferably from 0.41 m/s to 0.7 m/s. Kelp farming operations cannot endanger the marine environment. (3) Farming management. 1. Summer seedling cultivation: (1) Seedlings: The head seedlings are used, and the seedlings with the leaves stretched, the color is bright, the algae body is strong, and the pliable seedlings are selected. (2) Seaweed: The kelp is selected 20 days before the spores. The kelp is usually selected in mid-July, and the selection from the cultured kelp should be carried out before the kelp is harvested. Spore collection time is generally in early August, when the seawater temperature is around 22 °C. (3) Cultivation: The water temperature and light intensity are shown in Table 1. The fertilization, the water exchange rate per hour in the nursery pond, and the daily fresh seawater volume are shown in Table 2. Table 1 time water temperature °C light lx early August 8 ~ 9800 ~ 15008 mid to early September 7 ~ 81500 ~ 25009 mid-October to early October 1.5 ~ 6.52500 ~ 400010 mid-term 8 ~ 105000 Table 2 time fertilization, mg / L per Hour nursery pool water exchange rate % daily fresh sea water rate %NO-3-NPO3-4-P8 early month 1~2.50.05~0.1320258 mid-month to early September 2.5~3.50.13~0.1725～30359 mid-month to 10 In the middle of the month, 3.5～4.50.17～0.2330～5040～50(4) Diseases and control: The disease and its control methods during summer seedling cultivation are shown in Table 3. Name Causes of disease control methods Green rot disease Light deficiency leaves begin to turn green and soft from the tip, gradually decay rot seedlings spore attachment density is moderate, light intensity is appropriate, enhance scrubbing strength, increase water flow, white tip disease, light abruptly enhance algae tip pigment Decomposition, suddenly whitening, the cells only leave the cell wall to adjust the light to make it suitable for uniformity, prevent the seedlings from being stimulated by strong light, reduce the spore adhesion density, increase the water flow, and timely wash the spores and gametophytic death and the young sporozoites. Deformed rotten kelp matured poorly or matured too much, the attachment base was not well treated, the water quality deteriorated, the gametophytic cell mature stage was strongly stimulated by the strong light to stimulate the gametophytic stage, the embryonic spore germination was abnormal, the gametophytic cells were irregularly divided, and the gametophytic growth period was lengthened. Can not be converted into young spores using a good variety of kelp spores, nursery curtains should be strictly treated and maintain good seedling water quality, avoid glare stimulation, after the onset of cooling, washing, isolation and other methods (5) Xia Miao holding: Temporary water layer: a sea area with less transparency, the initial water layer can be between 50cm and 80cm, 1 Gradually increase to 20cm to 30cm in 0 days; in the sea area with large transparency, the initial water layer can be around 100cm, and then gradually increase to 30cm to 50cm. (6) Seedlings: seedlings at the end of October or early November, ending in early December. When the seedlings are divided, the length of the seedlings is preferably 15 cm to 20 cm, and the minimum is not less than 10 cm. When the seedling grows to (20 ± 2) cm, the seedlings can be divided. 2. Kelp cultivation: (1) Water depth: The kelp can be cultured at a water depth of 5m to 30m, of which the 20m to 30m sea area is a high-yield sea area. (2) Cultivation method: Adopt the flat method. The floating raft is in the direction of the flow, and the sling is hung between the two trusses by the sling. The kelp receives light evenly and is conducive to growth. (4) Harvesting and post-harvest handling. In mid-May, the ratio of fresh to dry is 7:1, and the water temperature is above 15 °C. 17 ° C cold air storage. (5) Quality characteristics. 1. Dry kelp: sensory and physical and chemical indicators items The first-level sensory indicators of the first-class products are clean and flat, and the straight part is dark brown to light brown. There is no paste between the two, no mold, no spots, no kelp root. The leaf body is clean and flat, the straight part is brown to yellowish brown, there is no paste between the two, no mildew, and there is a flower spot. The sum of the areas does not exceed 5% of the leaf volume plane, and there is no kelp root. The leaf body is more than 100cm long (including 70cm from the base of the leaf, enough to break the kelp without yellow and white edges) 80cm or more (including the broken kelp from the base of the leaf, 50cm without yellow and white edges). The maximum width of the leaf body is 13cm or more and 10cm or more. Allow one or both sides of the leaf body to have a length of no more than 10cm yellow white tip without water, %≤18≤20 sediment impurities,%≤2≤3 protein (on a dry basis),%≥7 iodine (on a dry basis) Meter), mg / 100g ≥ 300 calcium (on a dry basis), mg / 100g ≥ 150 iron (on a dry basis), mg / 100g ≥ 7 zinc (on a dry basis), mg / 100g ≥ 22. Salt Kelp: Sensory and physical and chemical indicators project requires first-class product, second-class sensory index, uniform color, green and green, brown-green tissue morphology, smooth surface, no mucus, no sporangia, smooth surface, no mucus, allow a small amount of spores The sacs are neat and basically uniform, and the taste is crisp and tender. It has the inherent odor of salted kelp. No odor and impurities are visible to the naked eye. There is no gingival sensation when chewing. %≤68 salt (in terms of NaCl),%20 ~24 floating salt, % ≤ 2 protein (on a dry basis), % ≥ 4 iodine (by dry basis)

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Producers within the scope of protection of Weihai kelp GI products may submit an application to the Weihai Municipal Bureau of Quality and Technical Supervision for the use of the “Special Mark for Geographical Indication Products”, which shall be approved by the General Administration of Quality Supervision, Inspection and Quarantine.