The term aquatic can be applied to animals that live in either fresh water (fresh water animals) or salt water (marine animals). However, the adjective marine is most commonly used for animals that live in saltwater, i.e. in oceans, seas, etc.
Aquatic animals (especially freshwater animals) are often of special concern toconservationists because of the fragility of their environments. Aquatic animals are subject to pressure from overfishing,destructive fishing, marine pollution andclimate change
then live as terrestrial adults, and may return to the water to mate.
Certain fish also evolved to breathe air to survive oxygen-deprived water
A large proportion of all life on Earth lives in the ocean. The exact size of this large proportion is unknown, since many ocean species are still to be discovered. The ocean is a complex three-dimensional world[3]covering approximately 71% of the Earth's surface.
Large areas beneath the ocean surface still remain effectively unexplored.
The development of technology such as sound navigation ranging, scuba diving gear, submersibles and remotely operated vehicles allowed marine biologists to discover and explore life in deep oceans that was once thought to not exist
The development of technology such as sound navigation ranging, scuba diving gear, submersibles and remotely operated vehicles allowed marine biologists to discover and explore life in deep oceans that was once thought to not exist
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