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The Speedy Cold-Hearted Tuna

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Most fish are pretty sluggish in the cold. But the Pacific bluefin tuna is one of the fastest apex predators in the frigid Pacific ocean. Their physiology has adapted to help them retain more of the heat their bodies produce, except when it comes to their cold, cold hearts.

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Sources:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5332387/
https://www.sciencedirect.com/science/article/pii/B9780123847195001489?via%3Dihub
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https://www.noaa.gov/education/resource-collections/ocean-coasts/ocean-currents

Images:
https://commons.wikimedia.org/wiki/File:Pacific_bluefin_tuna.jpg
https://commons.wikimedia.org/wiki/File:Thunnus_orientalis_(Osaka_Kaiyukan_Aquarium).jpg
https://www.storyblocks.com/video/stock/school-of-fish-sharks-swim-in-a-circle-bxmooud427jnu9515v
https://www.storyblocks.com/video/stock/shoal-of-jack-fish-in-tulemben-in-bali-indonesia-mcuixdu
https://commons.wikimedia.org/wiki/File:Thunnus_orientalis.jpg
https://commons.wikimedia.org/wiki/File:Circulus_arteriosus_schaf.jpg
https://commons.wikimedia.org/wiki/File:Laika_ac_Tuna_Tank_(7472071434).jpg
https://www.storyblocks.com/video/stock/a-view-up-to-the-ocean-surface-from-deep-underwater-hh7rfzgp8k8ha2v7f
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Documentary
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