Health risks
Some large fish, such as tuna (especially bluefin), can harbor high levels of mercury. This is due to the tuna's position at the top of the food chain (among sea creatures). Thus, tuna can lead to mercury poisoning when consumed in quantity.The FDA recommends, for certain groups (women who might get pregnant, pregnant women, nursing mothers and young children), eating up to 12 ounces a week of a variety of fish and shellfish.
Parasite infection by raw fish involves mainly three kinds of parasites: Clonorchis sinensis (a trematode/fluke), Anisakis (a nematode/roundworm) and Diphyllobothrium (a cestode/tapeworm).[citation needed] Infection risk of anisakis is particularly higher in fish which may live in a river such as salmon (shake) in Salmonidae, and mackerel (saba). Such parasite infections can generally be avoided by boiling, burning, preserving in salt or vinegar, or freezing overnight.
For the above reasons, the EU regulation No 853/2004 forbids the use of fresh raw fish; it has to be frozen at temperatures below −20 °C in all parts of the product for no less than 24 hours.
Some forms of sushi, notably those containing pufferfish fugu and some kinds of shellfish, can cause severe poisoning if not prepared properly. Particularly, fugu has a lethal dose of tetrodotoxin in its internal organs and must be prepared by a licensed fugu chef who has passed the prefectural examination in Japan.The licensing examination process consists of a written test, a fish-identification test, and a practical test, preparing and eating the fish. Only about 35 percent of the applicants pass, and in rare cases, death results.The Emperor of Japan is forbidden to eat fugu, as it is considered too risky.
Presentation
Traditionally, sushi is served on minimalist Japanese-style, geometric, mono- or duo-tone wood or lacquer plates, in keeping with the aesthetic qualities of this cuisine.
Many sushi restaurants offer fixed-price sets, selected by the chef from the catch of the day. These are often graded as shō-chiku-bai (松竹梅), shō/matsu (松, pine), chiku/take (竹, bamboo) and bai/ume (梅, ume), with matsu the most expensive and ume the cheapest.
In Japan, and increasingly abroad,sushi is served kaiten zushi (sushi train) style. Color coded plates of sushi are placed on a conveyor belt; as the belt passes customers choose as they please. After finishing, the bill is tallied by counting how many plates of each color have been taken. Newer kaiten zushi restaurants use barcodes or RFID tags embedded in the dishes to bill automatically and manage elapsed time after the item was prepared.
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