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In page Clupeidae:

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The Clupeidae family primarily feed on small planktonic organisms. The teeth of members of this family are either reduced or absent, reduced teeth are miniature teeth that would be barely visible and line the interior of the fish's mouth. The structure of these teeth indicate that these organisms do not need to cut or tear their prey items as they would need fully formed teeth to complete this process. They do, however, possess long gill rakers that are designed for sifting plankton and other small particles out of the water as it passes through their gills.[citation needed] Gill rakers are protrusions along the gill arch, opposing the gill filaments, that help aquatic organisms to trap food particles.