“Do you know how the Blue Lobster phenomenon can happen?”
It’s a mutation that naturally occurs in pigment-producing cells.
Lobsters have 3 colored pigments, which you can think of as blue, red or yellow. A “normal” lobster has a mix of all three. Blue lobsters have too much of the blue pigment. There are red and yellow lobsters as well, but they are much rarer, and they can even be albino (almost no pigment).
I saw a blue lobster in the Mystic Aquarium years ago. They are quite beautiful.