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The crocodile icefish or white-blooded fish (Channichthyidae) comprise a family of notothenioid fish found in the Southern Ocean around Antarctica and southern South America, where water temperatures remain relatively stable (generally ranging from -1.8 to +2.0 °C). Sixteen species of crocodile icefish are currently recognized. All icefish are believed to be piscivorous but can also feed on krill. Icefish are ambush predators; thus, they can survive long periods between feeding and often consume fish up to 50% of their own body length. Maximum body lengths of 25–50 cm have been recorded in these species.

To compensate for the loss of hemoglobin, they have larger blood vessels (including capillaries), greater blood volumes (four times that of other fish), bigger hearts, and greater cardiac outputs (fivefold greater) compared to other fish. Their hearts lack coronary arteries, and the ventricle muscles are very spongy, enabling them to absorb oxygen directly from the blood they pump.

Photographer: Ambiederman

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-|style="padding:0 0.9em 0 0;" | [[File:Gentoo Penguin AdF.jpg|300px]]
+|style="padding:0 0.9em 0 0;" | [[File:C. aceratus.jpg|300px]]
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-The long-tailed '''[[gentoo penguin]]''' is a penguin species in the genus ''Pygoscelis'', most closely related to the [[Adélie penguin]] and the [[chinstrap penguin]]. The first scientific description was made in 1781 by Johann Reinhold Forster with a reference point of the Falkland Islands. They call in a variety of ways, but the most frequently heard is a loud trumpeting which is emitted with its head thrown back.
+The '''[[crocodile icefish]]''' or '''white-blooded fish''' (''Channichthyidae'') comprise a family of notothenioid fish found in the [[Southern Ocean]] around [[Antarctica]] and southern South America, where water temperatures remain relatively stable (generally ranging from -1.8 to +2.0 °C). Sixteen species of crocodile icefish are currently recognized. All icefish are believed to be piscivorous but can also feed on [[krill]]. Icefish are ambush predators; thus, they can survive long periods between feeding and often consume fish up to 50% of their own body length. Maximum body lengths of 25–50 cm have been recorded in these species.
-The gentoo penguin is easily recognized by the wide white stripe extending like a bonnet across the top of its head and its bright orange-red bill. It has pale whitish-pink webbed feet and a fairly long tail - the most prominent tail of all penguins. Chicks have grey backs with white fronts. As the gentoo penguin waddles along on land, its tail sticks out behind, sweeping from side to side, hence the scientific name ''Pygoscelis'', which means "rump-tailed".
+To compensate for the loss of hemoglobin, they have larger blood vessels (including capillaries), greater blood volumes (four times that of other fish), bigger hearts, and greater cardiac outputs (fivefold greater) compared to other fish. Their hearts lack coronary arteries, and the ventricle muscles are very spongy, enabling them to absorb oxygen directly from the blood they pump.
-<p><small>Photographer: Arturo de Frias Marques </small></p>
+<p><small>Photographer: Ambiederman </small></p>
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Difference between revisions of "Template:POTD protected"

Revision as of 08:51, 2 September 2019

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