Do Fish Have Blood and Hearts, What Color Is Fish Blood, and Why Don’t Fish In Stores Have Blood?

Fish do have blood, and it is red.

Other cold-blooded animals, like amphibians and reptiles, also have red blood.

Fish have a circulatory system with blood and a heart as the pump just like that of humans, and just like that of humans, fish blood is red because it contains hemoglobin, the iron compound that carries oxygen.

If a fish is fresh and is cut near major vessels, you will see blood.

In muscle tissue, which becomes fillets, the vessels are so small that the blood may not be evident, or if the fish is not fresh, the blood may have coagulated or collected in one part of the body.

Fish from the fish market may have already been gutted and beheaded and so may be drained of most blood.

Even so, you might see blood around the spine, because a major blood vessel goes right under the arches of the vertebral column.


  1. Jacob says

    Fact: fish blood is not red, it is blue, just like any other living animal, what turns it red is oxygen, if u bleed in water, notice it is blue, because there is no oxygen, but out water, the oxygen turns it red. So fact is, the blood is blue

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