the most common)—have a low energy cost, typically less than 300 mL/kg. But, traditional Christmas Eve dinners in Austria, Czech Republic, Germany, and Poland aside, carp is quite an unpopular culinary choice in Europe and it is barely eaten in North America, while demand for tuna, some species of which are now among the most endangered top marine carnivores, has been soaring thanks to the rapid worldwide adoption of sushi.
