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

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? ... we explain like I'm five Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: lthawkington, yensid7, johan_no, imunown frosti11icus, kynthrus, alienrouge To the ELI5 community that has supported us so far, thanks for all your feedback and comments. Send us an e-mail: [email protected]