Why Are Some Mussels Red?
Some mussels like the Mediterranean mussel and the blue mussel appear to be red due to the presence of pigments called mytiloxanthin and astaxanthin in their tissues. These pigments are produced by the mussels as a response to stress, such as changes in temperature or exposure to sunlight, and help protect their tissues from damage. The intensity of the red coloration varies depending on environmental conditions and the individual health of the mussel.