Crab is an animal we often see, belonging to crustaceans.There are many kinds of crabs, and the time that crabs live in different waters is different, and sometimes the difference is quite large.For example, crabs living in shallow water can generally live for about three years.There are also some crabs living in the deep sea area, they can even live for decades, the life span is very long.Although their theoretical life span is relatively long, there are many factors that affect the length of their life, such as environmental pollution and artificial hunting, which may shorten their life span.
Crabs that can live for a relatively short period of time are artificially bred crabs. Many of these crabs are used for food, so they can hardly live for long.Generally speaking, the life span of these crabs is only about 22 months, and they will be sold soon after a period of breeding.
There are many varieties of crabs, and the body shapes of these varieties are different, and sometimes the differences are relatively large.Larger crabs, such as Alaskan king crabs, can reach a shell length of 28 centimeters and weigh about 10 kilograms.When their legs are stretched out, they can grow to more than 1 meter, and some can be close to 2 meters; There are also giant crabs, whose bodies can grow to about 38 centimeters long and weigh more than 20 kilograms.When their chelicerae are extended, they can span up to 4.2 meters.
Of course, not all crabs can grow so big, and many crabs themselves are relatively small, for example, some hairy crab shells are only about 6 centimeters in diameter.In addition, even the same species, but also because of the different environmental factors lead to subtle differences in body size.
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