Why is the blue crab called the blue crab?

Answer 1

The only information that I could find on it was that it is the lack of a gene that causes them to be blue. Some lobsters are blue because they are albinos, perhaps this is the same with crawdads. In the wild, you will sometimes find blue crayfish because of a genetic mutation. But there are also blue crayfish sold in aquarium stores that have been grown to be blue by giving them a feed that lacks red pigment.

Answer 2

The blue crab is called the blue crab because some specimens are quite blue, but mainly it's their claws/appendages which hold the color.

But either way, blue crabs have blue on them, and thus you have a "Blue crab".

Answer 3

The blue pigment present in the exoskeleton and giving rise to the name in some blue crabs is alpha-crustacyanin. As with other crustaceans like lobsters which are not red in their natural habitat, there are other pigments like astaxanthin which can survive heating while the blue cannot, hence, after cooking they appear red or pink.

Answer 4

some Craw fish are blue because before they were born the female ate something blue and it got mixed with some of the eggs before they came out. so when they were born they were blue.