ナショナルジオグラフィックのインスタグラム(natgeo) - 10月1日 04時25分

Although basking sharks are the second biggest fish in the sea, they have tiny prey. They eat zooplankton, with particular preference for a group of tiny crustaceans called copepods. After locating a zooplankton patch, they open their giant mouths and swim through it, as shown in this video by @bertiegregory. The huge white gill arches contain rakers—structures that snag plankton from the water that passes through the mouth. Unlike many other species of filter feeders that are able to pump water past these gill rakers, basking sharks feed passively. This means they must swim to eat. Given their huge size, they need to do a lot of eating—and therefore a lot of swimming. It’s estimated they can filter two million liters of water an hour! Concerned about being swallowed by these gentle giants? While they have a three-foot-wide mouth, their throats are incredibly narrow, so even if they wanted to swallow a person (which they don’t), they physically couldn’t!
#britishwildlife #underwater #freediving #baskingshark #shark

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