I remember my father as a child telling me, instead of stories, the biological structure of fish. Then I learned that the body of the tuna has a spindle-shaped dense network, which allows for high speeds - up to 75 km / h; in turn, the lack of a swim bladder (in most species) and the structure of the head makes it difficult to stay fish at rest, forcing to constant movement. Now I constantly go fishing on the nearest flight db auskunft. In a couple of hours, I'm already there.