A female blue crab will “lay” 700,000 to 2,000,000 eggs at once. However, only about 1 out of every 1,000,000 will survive to adulthood. These numbers will probably be similar for other species, but keep in mind that variation happens between species.
This greatly depends on the species of crab, as well as the size of the female. Larger females produce many more eggs than do their smaller counterparts. Freshwater crabs also have relatively few eggs compared to marine crabs. If you could be more specific about a species I might be able to help more.
It varies quite a bit, depending on the species. A hermit crab can lay about 800-1000 eggs, while the Christmas Island crab population lays around 200 million a year, which can lead to a bit of a problem when they all hatch and migrate!
[img_assist|nid=168136|title=Christmas Island Crabs|desc=|link=none|align=left|width=640|height=480]
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