A large vegetarian member of the piranha family, the tambaqui is native to the Amazon River. It has a firm, white flesh that tastes more like veal or pork than fish. Outside of Brazil, tambaqui is obtainable solely in frozen form. In the United States, it's typically available only in upscale restaurants.
From The Food Lover's Companion, Fourth edition by Sharon Tyler Herbst and Ron Herbst. Copyright © 2007, 2001, 1995, 1990 by Barron's Educational Series, Inc.