by 
Anonymous
ANSWERS: 3
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I have eaten thousands of crawfish but I have never seen the blood. I can tell you that it isn't some weird color like pink or neon green.
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Pale yellow when deoxigenated, deep blue when oxygenated. (Crayfish have haemocyanin to carry oxygen, and not haemoglobin.)
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It contains hemocyanin, a copper-based protein that turns blue in color when oxygenated, instead of the iron-based hemoglobin in red blood cells found in vertebrates, thus giving hemolymph a blue-green color rather than the red color of vertebrate blood. By: http://www.mintly.in
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