There's a family of cold-water fish, the Crocodile Icefish, who completely lack hemoglobin.https://en.wikipedia.org/wiki/Channichthyidae …
Replying to @St_Rev
Oxygen can diffuse in the hemoglobin-less plasma because it's so cold. The same phenomena that allows our (cold) soda to be carbonated! Fascinating!
3:58 AM - 12 Mar 2018
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