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A little wonder, every day

Icefishes without hemoglobin

Справжня Chaenocephalus aceratus біля Palmer Station, Антарктика; не ілюстрація та не проба крові / Actual Chaenocephalus aceratus at Palmer Station, Antarctica; not an illustration or blood sample. Credit: Ambiederman; CC BY-SA 4.0. https://creativecommons.org/licenses/by-sa/4.0 Source: https://commons.wikimedia.org/?curid=44782473

Справжня Chaenocephalus aceratus біля Palmer Station, Антарктика; не ілюстрація та не проба крові / Actual Chaenocephalus aceratus at Palmer Station, Antarctica; not an illustration or blood sample. Credit: Ambiederman; CC BY-SA 4.0. https://creativecommons.org/licenses/by-sa/4.0 Source: https://commons.wikimedia.org/?curid=44782473

Listen to fact0:00 / —

Adult icefishes of the family Channichthyidae are a notable vertebrate exception: they lack functional hemoglobin and ordinary red blood cells. Oxygen travels dissolved in plasma rather than carried by the red pigment. This concerns a particular southern fish family, rather than every fish informally called an icefish.