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At SharpWebLabs.com we carry a wide assortment of packaged seaweeds. Seaweeds are extensively used as food by coastal peoples, particularly in Japan and Korea, but also in China, Vietnam, Indonesia, Peru, the Canadian Maritimes, Scandinavia, Ireland, Wales, Philippines, and Scotland, among other places. For example, Porphyra is a red alga used in Wales to make laverbread, and in Japan dried, formed into sheets called nori which is widely used in soups, and for wrapping sushi, boiled rice stuffed with bits of raw fish, sea urchin roe, or other ingredients. Chondrus crispus (commonly known as Irish moss) is another red alga used in producing various food additives.

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Sea Lettuce
Appearance: Green seaweed, sheetlike in appearance. Can be white or black when dry. Ranges in size from 6 inches to 2 feet. Habitat: High and low intertidal zones; water to 75 feet deep. Seasonal appearance: All year, with large blooms in the summer.

Description
Sea lettuce is a bright green algae composed of lobed, ruffle-edged leaves that are coarse and sheet-like and resemble a leaf of lettuce. The leaves may appear flat, thin, broad, and often rounded or oval. Its leaves are often perforated with holes of various sizes. Almost no stalk exists at the point of attachment, and no true roots are present. When dried by the sun, its color can range from white to black.

Life History and Growth
Sea lettuce may be found attached to rocks and shells by a holdfast, but it is also commonly found free floating. Among the most familiar of the shallow water seaweeds, sea lettuce is often found in areas of exposed rocks and in stagnant tide pools. Sea lettuce has also been recorded at depths of 75 feet or more. Sea lettuce grows in both high and low intertidal zones and marshes throughout the year.

Tolerant of nutrient loading that would suffocate many other aquatic plants, it can actually thrive in moderate levels of nutrient pollution. Large volumes of sea lettuce often indicate high levels of pollution. Growth is also stimulated by the presence of other pollutants. It is often found in areas where sewage runoff is heavy. As a result, sea lettuce is used as an indicator species to monitor pollution trends. The density and location of this alga can often indicate the presence of high amounts of nutrients.