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Plankton浮游生物

双升范文写作网 http://www.weifanghuagong.cn 2019-11-26 18:30 出处:网络 编辑:





Scattered through the seas of the world are billions of tons of small plants and animals called pla。nkto。n. Most of these plants and animals are too small for the human eye to see. They drift about lazily with the currents, providing a basic food for many larger animals.

Plankton has been described as the equivalent of the grasses that grow on the dry land continents, and the comparison is an。 appropriate one. In po。tential food value, however, plankton far outweighs that of the land grasses. One scientist has estimated that while grasses of the world produce about 49 billion tons of valuable carbohy。drates each year, the sea's plankton generates more than twice as much.


Despite its enor。mous food potential, little effect was made until recently to farm plank。ton as we。 farm grasses on land. Now marine scientists have at last begun to study this possibility, especially as the s。ea。's resources loom even more important as a means of feeding an expanding world population.


No one yet has seriously suggested that " plankton。-burgers" may soon become popular around the world. As a po。ssible farmed supplementary food source, however, plankton is gaining considerable interest among marine scientists.


One type of plankton that seems to have great harvest possibilities is a tiny shrimp-l。ike creature called krill. Growing to two or three inches long, k。rill pro。vides the major food for the great blue whale, the largest animal to ever inhabit the Earth. Realizing that this whale may grow to 100 feet and weigh 150 to。ns at m。aturity, it is not surprising that each one devours more tha。n one ton o。f krill daily.





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