The Speedy Cold-Hearted Tuna

SciShow
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
https://pubmed.ncbi.nlm.nih.gov/20667881/
https://www.pnas.org/content/112/27/8350
https://pubmed.ncbi.nlm.nih.gov/9359368/
https://pubmed.ncbi.nlm.nih.gov/25540278/
https://link.springer.com/article/10.1007/s10641-008-9409-8
https://link.springer.com/article/10.1007/s10695-006-9104-7
https://journals.biologists.com/jeb/article/210/23/4254/17208/Temperature-effects-on-metabolic-rate-of-juvenile
https://www.int-res.com/articles/meps2008/356/m356p239.pdf
https://islandscholar.ca/islandora/object/ir%3A1058/datastream/PDF/view
https://www.sciencedirect.com/science/article/abs/pii/S0079661117300988
https://www.int-res.com/articles/meps2008/356/m356p239.pdf
https://www.sciencedaily.com/releases/2015/02/150205083040.htm

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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