Fish

Have you ever wondered how fish survive underwater?

Unlike humans, fish don’t have lungs. Instead, they use gills to extract dissolved oxygen from water.

Fish have streamlined bodies for smooth movement through the water and paired fins—the tail fin propels them forward, while the side fins aid in steering.

They are ectothermic, meaning their body temperature changes with their surroundings, allowing them to survive in various environments.

Fish also have scales that act like armor and a slimy coating that helps them move quickly through the water.

Most fish lay eggs, with fertilization occurring inside or outside the mother’s body, depending on the species. This allows them to produce large numbers of offspring, increasing their chances of survival.

Fish play an essential role in ecosystems by controlling insect populations, cleaning up algae, and providing food for many animals.

They are also a major food source for humans. Some of the most commonly farmed fish include tilapia, salmon, catfish, and carp.