"Barbara Block" is an American marine biologist, and Charles & Elizabeth Prothro Professor in Marine Sciences

Evolutionary, Cellular and Molecular Physiology, at Stanford University.

She has established the Tuna Research and Conservation Center, with the Monterey Bay Aquarium.

More Barbara Block on Wikipedia.

Sharks are declining globally, yet the movements and habitats of most species are unknown.

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We combined radio uplinking SPOTs that give us accurate positions and data-logging PATs that store information for the duration of the programmed mission, ... By using two types of tags, we're able to accumulate a larger dataset on the sharks' habitat and preferences with a greater accuracy than we've been able to do before.

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The shark heart slows down in the cold, just as our own heart would, ... But ... where our heart would simply stop, the salmon shark's keeps on ticking.

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Sharks have home ranges that are at the scale of ocean basins.

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Sharks are some of the least understood predators on the planet. ... We can go to the moon and plan a trip to Mars, but we're barely starting a mission in the Pacific Ocean.

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The shark heart slows down in the cold, just as our own heart would. But what sets it apart is where our heart would simply stop, the salmon shark keeps on ticking.

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Sometimes in winter the surface waters, which are less salty, were so cold that the sharks spent more time in warmer, saltier waters below, ... When I glimpsed the sharks' radio positions from these frigid seas, I often wondered what it would be like to overwinter in the wilds of an Alaska fjord chasing herring in constant darkness.

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I like to check on the position of the sharks with my coffee every morning.

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