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Fish

The fish are watery vertebrate animals called to cold blood , equipped with fins and whose body is generally covered with scales. They generally breathe thanks to gills, but certain species, the such , have more or less rudimentary lungs.

More exactly, their internal temperature strongly varies with that of the medium . Recent studies show that certain predatory species are able to maintain their muscles #D05C75 with a few degrees above the temperature of water (sharks, tunas), which increases their performance at the time of the constant stroke.

( source)
A carp  
A carp ()  
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