Why does the shark store oil in its liver?

Introduction: The Shark’s Liver Oil

Shark liver oil is a valuable commodity used for various purposes, ranging from pharmaceuticals to cosmetics. The oil is derived from the liver of sharks, which can comprise up to 25% of the shark’s body weight. The liver oil is rich in squalene, an organic compound that has moisturizing and healing properties, making it a sought-after ingredient in various products. But why do sharks store oil in their liver?

An Evolutionary Advantage: The Shark’s Liver

Sharks have evolved to store oil in their liver as a way to maximize their buoyancy. Unlike bony fish that have a swim bladder to control their buoyancy, sharks rely on their liver oil. The liver oil is not only lighter than water but also has a low density, making it an excellent source of buoyancy. Additionally, the liver oil can also serve as an energy reserve, enabling sharks to survive for extended periods when food is scarce. This unique adaptation allows sharks to swim effortlessly and efficiently in their aquatic environment.