ウナギ is the Japanese word for freshwater eel, particularly the Japanese eel, nihon unagi. Unagi is a common ingredient in Japanese cooking, often as kabayaki. It is not to be confused with saltwater eel, which is known as anago in Japanese.
Specialist unagi restaurants are common in Japan, and commonly have signs showing the word unagi with hiragana う (transliterated u), which is the first letter of the word unagi. Lake Hamana in Hamamatsu city, Shizuoka prefecture is considered to be the home of the highest quality unagi; as a result, the lake is surrounded by many small restaurants specializing in various unagi dishes. Unagi is often eaten during the hot summers in Japan. There is even a special day for eating unagi, the Midsummer Ox Day (doyo no ushi no hi).
Unakyu is a common expression used for sushi containing eel and cucumber. As eel is poisonous unless cooked, eels are always cooked, and in Japanese food, are often served with tare sauce. Unagi that is roasted without tare and only seasoned with salt is known as "shirayaki."
Unagi is also commonly served in nigiri style, where a slice of grilled and glazed eel is placed atop a small bed of sushi rice, often secured with a thin strip of nori.
Although about 90% of freshwater eel consumed in the U.S. are fish farming, they are not captive breeding. Instead, young eels are collected from the wild and then raised in various enclosures. In addition to wild eel populations being reduced by this process, eels are often farmed in open net pens which allow , waste products, and diseases to flow directly back into wild eel habitat, further threatening wild populations. Freshwater eels are and as such are fed other wild-caught fish, adding another element of unsustainability to current eel farming practices.
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