Copepod

... if you were assisting me and my colleagues with the research in Vancouver Lake, and you found that the Lake has a large population of a particular copepod (a kind of zooplankton) that looks very similar to, but not completely identical to, a copepod species commonly found in the Columbia River ...

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anyone? it doesnt have to be copepod, but maybe something closeley related? any info would be apreciated

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