The result is a ropy, chewy — and less appetizing — texture when the meat is raw. Cooking softens the connective tissue in meat and improves its texture (it also makes it juicy and flavorful).
In general, the more a muscle works, the tougher, more iNews,双语资讯,双语,it gets, Mouritsen writes in his book. This idea explains why the belly of the tuna, known as otoro, is exceptionally soft: The belly of the fish is the laziest muscle of them all.
"In contrast, those muscles that are more active in a tuna, say the ones in its fins and tails, are a bit more chewier than other muscles," he says.
Under a microscope, fish, chicken and other meat muscles look similar, with long, parallel fibers, like ropes, stretched out and tied together.
But when you zoom in a little closer, the fish muscles look like the Kate Moss of the bunch: Their fibers are slimmer, shorter and more delicate than the others.
The muscle properties of fish also explain the rainbow of colors you see at a sushi bar.
"Fish that are constantly on the move — say, a tuna — have muscles that are always working and burning carbohydrates aerobically," Mouritsen says.
The muscles need oxygen to make energy. And the molecule that carries oxygen to muscle contains iron. Guess what color iron is in the fish? Red.
In contrast, fish that mostly hang out in one place or on the bottom of the ocean — say, for instance, flounder — have muscles that don't rely on oxygen to create energy. No oxygen means no iron to carry it, which means the muscles tend to be white. (Of course, most fish have a mixture of these two type of muscles and thus can look red, white or pink.)
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