Seaweed is a loose indication of groups of unrelated algae that live in the sea or in brackish water. Usually this refers to multicellular, relatively large (macroscopic, recognizable to the naked eye) algae or seaweeds that are attached to the bottom. Seaweeds can be found among the green algae (Chlorophyta), the red algae (Rhodophyta) and the brown algae (Phaeophyta). The terms algae and seaweeds are usually used interchangeably without much distinction.
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Biology
Seaweeds and other algae are eukaryotes and perform their photosynthesis using chloroplasts or similar organelles. Generational changes can be found in several seaweeds. There are both isomorphic (successive generations have the same shape, e.g. in sea lettuce) and heteromorphic (successive generations have different shapes) species. The shape and ecology of the macroscopic seaweeds usually differ from that of the single-celled algae species.
Form
The appearance of seaweed is in some cases reminiscent of that of land plants. There are species with a stem-like structure with a foot that attaches itself to a substrate. In addition, there are often leaf-like structures with spore-forming parts.
Ecology
Seaweeds depend on salt water, sufficient light and a sufficiently firm substrate to adhere to. Seaweed is therefore often found in the littoral area and near rocky coasts. At its deepest, seaweeds in the Netherlands live within a few meters; this is due to the fact that the water is not clear enough to allow sufficient sunlight through at greater depths. At its highest, seaweed grows just below the highest water level. Under favourable conditions, seaweed can grow up to 60 metres long and therefore grows at much greater depths. Kelp (a large brown seaweed) forms the kelp forests together with many other species.
Uses of seaweed
Food
Seaweed is also used as food, although it is much less well known in Europe than in countries such as Japan and Korea. It can be eaten as a vegetable, but it can also be used as decoration and flavoring. In Sushi, strips of red seaweed (Nori) are used to keep the various rice and fish ingredients together by wrapping a narrow strip around the snack. Japanese salts, a kind of rice crackers or rice salts, are often also covered with some seaweed to give them a spicy taste. In Indonesia, seaweed is processed into agar-agar, a vegetarian binder or a substrate for the cultivation of bacteria. This food is known for its high concentrations of calcium, potassium and iron.
Seaweed is rich in minerals such as iodine and calcium and trace elements. Depending on the species, it also contains vitamins such as vitamin C and E. Brown seaweed contains about 5-10%, red seaweed and green seaweed about 10-30% protein. Part of seaweed is not broken down by the body and can be seen as dietary fiber.
Some seaweeds contain a vitamin B12-like substance, but it is inactive as a vitamin. As a nutrient for vegans it doesn’t work. The vitamin B12-like substance from algae can even have a negative effect by blocking the absorption of real B12.
The North Sea Farm Foundation started a small-scale trial to grow seaweed in the North Sea in 2015. Seaweed is also being grown in the Oosterschelde near Neeltje Jans.
Body care
Another way to use seaweed is through the skin: in sauna treatments, (thalasso) hydrotherapies, with body wraps or in body care products.
Fuel
Wageningen University started two trials in the North Sea in 2010, in which seaweed is grown for conversion into biogas.
Buy Seaweed Online
Jayone Seaweed, Roasted and Lightly Salted, 0.17 Ounce (Pack of 24)
- 100% Natural, Non-GMO, Gluten-Free, Vegan
- Contains DV of Iodine
- Perfect to take in lunch boxes or snack to go
- Only 30 calories per pack!
gimMe Organic Roasted Seaweed - Sea Salt - 20 Count - Keto, Vegan, Gluten Free - Great Source of Iodine and Omega 3’s - Healthy On-The-Go Snack for Kids & Adults
- HEALTHY SNACKs compatible with Keto, Vegan, Vegetarian, Gluten Free and Low Carb diets, gimMe’s Organic Roasted Seaweed is a SUPERFOOD that is enjoyed by Kids and Adults alike
- EAT ON THE GO by dropping in a single pack of gimMe Organic Roasted Seaweed in your bag or child’s lunchbox for a quick and easy snack; only 25 calories per a single pack
- #1 BEST SELLING Organic Seaweed Brand (Source: SPINS Topline Total (US - March 2020)
- Our original seaweed snack is made from premium organic seaweed, roasted to crispy perfection, and seasoned with one of six savory flavors; Sea Salt, Extra Virgin Olive Oil, Teriyaki, Toasted Sesame, Wasabi, and new Avocado Oil & Sea Salt - Try all Six!
- Sustainably cultivated and harvested from South Korea, seaweed is one of the most nutrient dense foods in the world and is naturally loaded with protein, fiber, vitamins and minerals; our seaweed has no artificial flavors or preservatives and is non-GMO, Contains 20 – 0.17oz (5g) Packs
Annie Chun's Organic Seaweed Snacks, Sea Salt, 0.16 oz (Pack of 12)
- America's 1 Selling Brand of Seaweed Snacks [Source: IRI Total US - MULO, Latest 52 Weeks Ending 3/22/2020]
- USDA ORGANIC savory Korean roasted seaweed snack
- Non-GMO, gluten-free, vegan, dairy-free, no trans fat, no cholesterol, no preservatives
- Just 25 calories per serving. Enjoy it anytime without feeling guilty
- Made in USA. Made specifically for snacking with quality ingredients, so delightful as-is
Daechun(Choi's1) Seaweed Snack, (Pack of 20), Sea Salt, Product of Korea
- 20 Pack
- Low Calorie
- Healthy Snacking
- Roasted & Seasoned
- Organic 10 Full Size Sheet KIMNORI Sushi Nori Premium Roasted Seaweed Rolls Wraps Snack 0.88 OZ ( 25g ) Laver, USDA ORGANIC, Gluten Free, No MSG, NON-GMO, Vegan (10 Sheet)
- NON-GMO Verified, Gluten Free Certified, Organic Certified, Vegan, No MSG, Kosher
- Made in U.S.A. / 김, のり, 海苔, 紫菜
- Ingredients: Laver 100%, Healthy, High Nutrition Low Calories & Fat, No MSG, No artificial colors or flavors
- Keeping Method: Avoid Direct Sunlight. Store in a cool and Dry place
Daechun(Choi's1) Sushi Nori (50 Full Sheets), Resealable, Gold Grade, Product of Korea
- Very Fresh.
- Gold Grade, Highest Grade Nori with Natural Unami flavor
- Net Weight: 4.4oz (125g), Product of Korea, South
- Each sush nori sheet is approximately 7.5" X 8.25"
- Resealable bag- store in the refrigerator
gimMe Organic Roasted Seaweed - Teriyaki - 20 Count - Keto, Vegan, Gluten Free - Great Source of Iodine and Omega 3’s - Healthy On-The-Go Snack for Kids & Adults
- HEALTHY SNACKs compatible with Keto, Vegan, Vegetarian, Gluten Free and Low Carb diets, gimMe’s Organic Roasted Seaweed is a SUPERFOOD that is enjoyed by Kids and Adults alike
- EAT ON THE GO by dropping in a single pack of gimMe Organic Roasted Seaweed in your bag or child’s lunchbox for a quick and easy snack; only 25 calories per a single pack
- #1 BEST SELLING Organic Seaweed Brand (Source: SPINS Topline Total (US - March 2020)
- Our original seaweed snack is made from premium organic seaweed, roasted to crispy perfection, and seasoned with one of six savory flavors; Sea Salt, Extra Virgin Olive Oil, Teriyaki, Toasted Sesam, Wasabi, and new Avocado Oil & Sea Salt - Try all Six!
- Sustainably cultivated and harvested from South Korea, seaweed is one of the most nutrient dense foods in the world and is naturally loaded with protein, fiber, vitamins and minerals; our seaweed has no artificial flavors or preservatives and is non-GMO, Contains 20 – 0.17oz (5g) Packs
Emerald Cove Silver Grade Wakame (Dried Seaweed), 1.76 Ounce Bag
- Vegan and Non GMO certified
- Great for Seaweed Salads
- Ready-to Eat
- Easy Seal Packaging
- 1.76oz
100 Full Size Sheets Resealable Bag Yaki Sushi Nori Roasted Seaweed Rolls N Wraps Laver 200 Gram - 7.05 Ounce - 100 Sheets, Resealable Bag / 7.05 oz / 김, のり, 海苔, 紫菜
- 100 Full Size Sheets Resealable Bag Yaki Sushi Nori Roasted Seaweed Rolls N Wraps Laver 200 Gram - 7.05 Ounce - 100 Sheets, Resealable Bag / 7.05 oz
- Roasted Seaweed ( 100% Laver ) / 100% Natural Seaweed Laver / Healthy, High Nutrition
- No Sugar, No Trans Fat / Made in South of Korea / 김, のり, 海苔, 紫菜
- Keeping Method: Avoid Direct Sunlight. Store in a cool and Dry place
gimMe Organic Roasted Seaweed - Extra Virgin Olive Oil - 20 Count - Keto, Vegan, Gluten Free - Great Source of Iodine and Omega 3’s - Healthy On-The-Go Snack for Kids & Adults
- HEALTHY SNACKs compatible with Keto, Vegan, Vegetarian, Gluten Free and Low Carb diets, gimMe’s Organic Roasted Seaweed is a SUPERFOOD that is enjoyed by Kids and Adults alike
- EAT ON THE GO by dropping in a single pack of gimMe Organic Roasted Seaweed in your bag or child’s lunchbox for a quick and easy snack; only 25 calories per a single pack
- #1 BEST SELLING Organic Seaweed Brand (Source: SPINS Topline Total (US - March 2020)
- Our original seaweed snack is made from premium organic seaweed, roasted to crispy perfection, and seasoned with one of six savory flavors; Sea Salt, Extra Virgin Olive Oil, Teriyaki, Toasted Sesame, Wasabi, and new Sea Salt & Avocado Oil - Try all Six!
- Sustainably cultivated and harvested from South Korea, seaweed is one of the most nutrient dense foods in the world and is naturally loaded with protein, fiber, vitamins and minerals; our seaweed has no artificial flavors or preservatives and is non-GMO, Contains 20 – 0.17oz (5g) Packs
Last update 2020-04-15. Price and product availability may change.