Nori seaweed sheet

Performance & sizing

Core numbers for matching this unit to your tank and electrical plan.

Power

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Flow rate

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Noise

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Dimensions

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Price range

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Tank fit (L)

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Consumables & maintenance

Follow the manufacturer schedule for seals, impellers, media, and other consumables.

Description

Aquarium listings sell nori as a source of iodine and trace minerals, and the iodine part is wrong. FAO's guide to the seaweed industry says it directly: brown seaweeds contain iodine, which is lacking in nori and other red seaweeds. Kombu and wakame are the brown ones. Nori is Porphyra, a red alga that grows as a thin flat blade in temperate intertidal zones and reaches the shop as a pressed sheet. What the same page does document is worth more than the iodine claim was. Nori is among the most nutritious seaweeds, at 30 to 50 percent protein, of which about 75 percent is digestible. Sugars are low, at 0.1 percent. The vitamin content is high, with significant amounts of vitamins A and C, niacin and folic acid, though the shelf life of vitamin C is short in the dried product, so a packet found at the back of a cupboard is not the food it was. Most of the salt is washed out during processing, which is why the sodium content is low. One distinction decides which packet to buy. Plain dried sheets are hoshi-nori. Toasted sheets are yaki-nori, and FAO notes that yaki-nori in use may be brushed with a mixture of soy sauce, sugar, sake and seasonings. That is a seasoning for people and none of it belongs in a tank, so read the ingredients and take the unseasoned one. A standard sheet is 20 by 20 cm and weighs 3.5 to 4.0 grams, which is a useful anchor when an instruction says half a sheet. FAO writes about nori as human food throughout and says nothing at all about feeding it to fish, shrimp or snails, so the clip on the glass is practice rather than citation.

Source

• fao.org — https://www.fao.org/4/y4765e/y4765e0b.htm

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