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Some are and some are not. The term "zooplankton" just means animals of any kinda that drift through the sea without the ability to swim against currents - mostly we think of tiny organisms like kryll (a kind of shrimp) but even full sized jellyfish are technically zooplankton. Many vertebrates are considered plankton when they are in their larval stage, such as baby fish that are too small to move against the water. Once they grow large enough to move on their own, though, they are no longer zooplankton.

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13y ago

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