Where Fish Live
Fish have adapted to many different habitats throughout the world. They live in mountain lakes at high altitudes as well as at depths of about seven miles (11 km) beneath the surface of the ocean. Polar species live in temperatures of 29° F. (-2° C.), while some fish, such as those found in Death Valley, live in temperatures of 104° F. (40° C.).
The climbing perch (also called the walking fish) has a supplementary breathing apparatus that enables it to take oxygen from the air. It also has gills, but they are not adequate to sustain life and the fish will drown when kept under water for a few hours. As long as its breathing apparatus is kept damp, it can spend several hours out of water. This fish uses its fins and movable, spiny gill covers as a means of locomotion on land. Certain blennies and other fish also spend much of their time on land. Lungfish hibernate in mud during the dry season. Their skin secretes a substance that keeps the skin moist for up to three years.
The climbing perch uses its fins and spiny gill covers to move on land.
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