Scientists have discovered an exceptional case of a partially warm-blooded fish, fundamentally changing our understanding of fish physiology.
is like"finding that cows have wings,"Of all the shark and fish species alive in Earth's oceans today, about 99.9 percent are thought to be cold-blooded.did experts realize that some shark and tuna species, like the great white shark or bluefin tuna, are not as cold as the water they swim in.
Some parts of these fish are warmer than the surrounding ocean, meaning they are not fully ectothermic, or cold-blooded. Instead, they are deemed 'regionally endothermic', or warm-blooded.that their novel circulatory system somehow secured their position at the top of the ocean's food chain.basking shark suggests regional endothermy does not only appear in apex predators.
When researchers dissected two dead basking sharks, they noticed an unusual amount of compact muscle around their hearts. This suggests that basking sharks can maintain higher blood pressure and blood flow than most other fish, facilitating warmer muscles and possibly allowing them to migrate and feed more efficiently in colder waters.the shark's enormous body size,
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