Bluefin swim at very high speeds-up to 80 kilometers an hour. Because of their huge size, they have to move fast for their gills to filter enough water to oxygenate their blood. Forcing these "hyperactive" fish to be still would kill them. Bringing bluefin back to land alive is immensely difficult.
此外，大洋洄游性的黑鮪魚，游泳速度超快，時速可達八十公里，加上體型龐大，為了得到足夠氧氣，以利血液充分循環，黑鮪魚必須作快速游動，讓魚鰓不停地過濾大量海水，因此牠們可以說是一群過動兒，要牠們安靜下來等於要牠們的命。