Why is it important to know the blue whale eats up to 16 tons of plankton daily? Because healthy oceans need whales—and their waste
that disrupt the normal circulation of nutrients, which could also harm krill and other food sources of baleen whales. This would be especially damaging, as these whales are still recovering from centuries of whaling.
For their investigation, Savoca’s team tagged 321 whales spanning seven baleen species: humpback whales, blue whales, fin whales, bowhead whales, Antarctic minke whales, Bryde’s whales, and North Atlantic right whales. A humpback whale tagged in the recent study erupts out of the water to feed. The whales have baleen plates inside their mouths that filter out tiny prey.The team also used drones to measure the size of the whale’s mouth, which enabled them to calculate the volume of water it can capture during such lunges. Sonar to measure the density of krill living in the whale’s habitat let them determine how many of these tiny shrimp-like animals the whale could swallow with each lunge.
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