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The ocean covers approximately 70% of Earth's surface, which means it is the largest environment for living things on Earth. There are five major ocean habitats: tropical or reef habitat, temperate waters, open ocean, the deep sea, and polar regions. Most sea life lives in the top 150 meters (500 feet) of the ocean. From the warm, sunlit waters of coral reefs to the dark, cold waters of the deep sea, the ocean teems with life.

The ocean is an important source of food and other resources. Since well before recorded history, humans have used the sea as a source of food. While only 5% of the protein consumed by world populations comes from the sea, it is still an important contribution to the diet of millions of the world's inhabitants. In 1996, Americans ate an average of 15 pounds of seafood per person.

For a very large, one-megabyte image of the chlorophyll concentration of the ocean in northern hemisphere summer, using all data from 1998-2002, click here: http://bluefin.gsfc.nasa.gov/

Fisheries biology is the study of fish in their natural environment and their utilization for the needs of humans. Fisheries biologists are concerned with maintaining the supply of fish or marine life which humans need. Many factors are involved, but the primary concern is usually with the marine organism itself.

What does El Niño have to do with fish?

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