Herring live in enormous schools, sometimes containing millions of fish. They swim at deep depths during the day. In the evening, they follow their prey closer to the surface and disperse just under the water surface for the night. Herring feed on animal plankton. As they swim, they sift these small animals out of the water with the help of filters located on the inside of their gills. The filter is made up of long 'thorns' which are situated as a comb on the gills. In turn, herring are a main source of food for predator fish, seals, cetaceans and sea birds. They play a key role in the North Sea ecosystem.
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