When deep-sea fishes are brought to the surface of the sea, their bodies burst. This is because the blood in their bodies flows at very

Deep-sea fishes are adapted to survive under extreme hydrostatic pressure. To counteract the crushing external force of the deep ocean, their internal body fluids, including blood, are maintained at a very high pressure. When these fishes are rapidly brought to the surface, the external ambient pressure decreases significantly [1]. According to Boyle's Law, the gases dissolved in their blood and tissues, as well as the air in their swim bladders, expand rapidly as the surrounding pressure drops. This sudden expansion causes the swim bladder to overinflate or burst and leads to the formation of gas bubbles in the circulatory system, a condition known as barotrauma [1]. The internal high pressure, no longer balanced by the external environment, causes the body tissues and organs to distend or rupture [1].

Sources

1. [1] https://dep.nj.gov/njfw/wp-content/uploads/njfw/down_we_go.pdf