ELI5 Crabs - why do crabs turn bright orange when cooked?

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If crab fishing is so dangerous (think Deadliest Catch) why aren’t there crab farms like we have with fish? How do crabs breathe both in the water and on land? What does the phrase ‘crab mentality’ mean?
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ELI5 Crabs - why do crabs turn bright orange when cooked?

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ELI5 Crabs - why do crabs turn bright orange when cooked?
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