What do crabs eat?

With regards to your enquiry on what do crabs eat, you may refer to the information below.

"...Crabs feed on many kinds of water organisms or the remains of organisms. Some species of crabs eat chiefly algae and plants.." (Source: The World Book Encyclopedia Publisher: World Book, Inc. cc2007, call number: Y R q031 WOR).

"...Crabs spend a large part of their time looking for food. They are not picky eaters and will feed on almost anything they can get their claws on. Small fish and shellfish are favorite foods, but some crabs live on seaweed or algae that they scrape off rocks with their claws. Shore crabs, such as ghost crabs and fiddler crabs, are often scavengers, eating the remains of dead animals and plants that they find..." (Source: Grolier Online: “Johnson, S. A. (2007). Crabs. The New Book of Knowledge®”).

"...crabs are often omnivorous and act as scavengers, but many are predatory and some are vegetarian..." (Source: Encyclopædia Britannica Online Library Edition)

You may also refer to the following websites.

1) Singapore Science Centre: ScienceNet – ‘What do crabs eat . . . ?’

2) Smithsonian Environmental Research Centre – ‘About Crabs’

3) ThinkQuest: Library – ‘Crab’

You may also refer to the following books for further information.
Title: The World Book Encyclopedia
Publisher: World Book, Inc. cc2007
Call number: Y R q031 WOR

Title: The natural world
Author: Harris, Nicholas
Call number: Y English 570.3 HAR
*available only at Bishan Community Library

You may check the availability of these book titles at http://vistawebnlb.gov.sg/index.html